Input / output facility device in electrical logic control equipment and electrical logic control equipment

Abstract

The invention relates to an input / output facility device in an electrical logic control device and the electrical logic control device. An input / output facility arrangement in an electrical logic control apparatus, the arrangement comprising digital input / output connections arranged for safety-related input / output and non-safety-related input / output, a non-safety logic controller module, a safety logic controller module or a safety logic interface, and a data isolation, wherein digital output signals from the non-secure logic controller module and from the secure logic controller module or from the optional secure logic controller module are combined with AND operators, wherein the secure logic controller module or optional secure logic controller module is configured to transmit signaling to or from a digital input / output connection, the digital input / output connection includes isolation between the non-secure logic control module and the secure logic control module or the optional secure logic control module.

Description

Technical Field

[0001] The present invention relates to the field of electrical logic control devices and motors, such as motors and generators for industrial applications, and in particular to input / output facility devices in electrical logic control devices and electrical logic control devices. Background Art

[0002] Electrical logic control devices are industrial computer devices suitable for controlling industrial equipment and industrial processes, such as manufacturing processing machines, assembly lines, robots, and various motors. Electrical drive devices are one example of electrical logic control devices.

[0003] Electrical drives are used in industry for different applications, for example in the transport industry for driving electric motors, in the process and manufacturing industries and in the energy industry for driving different devices. In the transport industry, there are some applications where electrical drives are commonly used, for example in metro and rail transit applications and in marine propulsion unit applications in the marine industry. In the energy industry, electrical drives can be used, for example, for the electrical drive of wind turbines in the wind power industry.

[0004] Electrically driven devices such as motors and generators can be divided into DC drives (DC, direct current) and AC drives (AC, alternating current). For example, in a DC motor in a DC drive, the magnetic field is generated by the passage of current through the field windings in the stator. This magnetic field is always kept at right angles to the magnetic field generated by the armature windings. In this way, the torque of the DC motor is generated, which can then be easily controlled in a DC drive by varying the armature current and keeping the magnetizing current constant. In a DC drive, the speed of the DC motor can also be controlled directly by the armature current.

[0005] Within electrical drives, AC drives can be further divided into frequency-controlled AC drives, flux-vector-controlled AC drives, and AC drives utilizing direct torque control (DTC). In flux-vector-controlled AC drives and direct torque control, the AC drive can control the torque of a three-phase motor or generator, while in variable-frequency-controlled AC drives, the driven / driven machine determines the torque level.

[0006] Functional safety is part of the overall safety of a system or equipment that relies on automatic safeguards that react to potentially dangerous situations. Safety measures are needed to ensure the safety of motors and their operators. Electrical logic control devices that provide safety functions can not only detect risks, but also take preventive measures to reduce them.

[0007] Functional safety of electrical logic control devices is standardized and governed by a number of appropriate standards and specifications. For example, functional safety requirements for electrical control systems relevant to machinery safety are provided in the IEC standard EN 62061 (IEC, International Electrotechnical Commission).

[0008] In the standardization process, it is required to prevent the NSR function (NSR, not related to safety) from interfering with the SR function (SR, related to safety). This is usually achieved by completely separating the signals. At present, in typical electrical logic control devices, such as frequency converters, the input of the SR output and the input of the NSR output are implemented separately.

[0009] European Patent Application Publication EP 3644145 A1 by Scheible et al. discusses aspects of control systems related to controlling safety critical and non-safety critical processes.

[0010] US patent application publication US2022 / 0382243 A1 by Katrak discusses aspects involving using a remote control to switch between safe and unsafe states while ensuring that functional safety requirements are met.

[0011] European patent application publication EP 3822789 A1 by Kuikka et al. discusses aspects of functional safety software concepts related to motor drives.

[0012] In the following, reference will be made to the Figure 1 Describing the prior art, the figure illustrates an input / output facility arrangement in an electrical logic control device according to the prior art.

[0013] Figure 1 The diagram shows an input / output facility arrangement in an electrical logic control device according to the prior art. In the presented prior art arrangement, there are safety-related input / output facilities 1 and non-safety-related input / output facilities 2. The safety-related input / output facilities 1 comprise safety-related digital input / output connections 3 (SR digital I / O) which are further connected to a safety logic controller module 4. The safety logic controller module 4 comprises a safety logic and safety level controller, i.e. a FSMCU (FS MCU, functional safety microcontroller unit). The safety-related input / output facilities 1 are completely separated from the non-safety-related input / output facilities 2. The safety logic controller module 4 provides a safety-related motor control 5 for controlling a motor.

[0014] The non-safety-related input / output facility 2 comprises a non-safety-related digital input / output connection 6 (NSR digital I / O) which is further connected to a non-safety logic controller module 7. The non-safety logic controller module 7 comprises a non-safety logic and a non-safety level controller, i.e. an MCU (MCU, microcontroller unit). The non-safety-related input / output facility 2 is completely separated from the safety-related input / output facility 1. The non-safety logic controller module 7 provides a non-safety-related motor control 5 for controlling the motor.

[0015] In many electrical logic control devices, especially in small inverters, the area available for input / output devices (i.e., I / O devices) is very limited. In a typical small inverter, there is enough space for conventional cable connectors and optional modules, which leaves no room for additional cable connections. In this exemplary configuration, adding any additional safety-related (SR) functions to the exemplary small inverter also requires the implementation of related I / O cable connectors, which in turn causes the size of the exemplary small inverter to increase. Therefore, if additional SR functions are added to the device, the implementation of the related I / O will cause problems.

[0016] With regard to the flexibility of the input / output facilities in electrical logic control devices, prior art solutions have a significant disadvantage.

[0017] In today's demanding environment, the input / output facilities in electrical logic control equipment require a more effective and elegant solution to provide advanced, flexible and reliable input / output facilities for electrical logic control equipment.

[0018] There is a need in the market for an electrical logic control device having an advanced, flexible and reliable input / output facility compared to current prior art solutions. Summary of the invention

[0019] The object of the present invention is to introduce an input / output facility arrangement in an electrical logic control device, which arrangement will provide the electrical logic control device with an advanced, flexible and safe input / output facility. Further advantageous embodiments are proposed.

[0020] A new input / output facility arrangement in an electrical logic control device is proposed, the arrangement comprising: digital input / output connections arranged for safety-related input / output and for non-safety-related input / output, a non-safety logic controller module connected to the digital input / output connections and configured to transmit signaling to or from the digital input / output connections, the non-safety logic controller module being configured to provide non-safety-related motor control for a motor controlled by the electrical logic control device, a safety logic controller module or a safety logic interface connected to the digital input / output connections, the safety logic interface being configured to receive an optional safety logic controller module, and data isolation, wherein digital output signals from the non-safety logic controller module and from the safety logic controller module or from the optional safety logic controller module are combined with an AND operator, wherein: the safety logic controller module or the optional safety logic controller module is configured to transmit signaling to or from the digital input / output connections and is configured to provide non-safety-related motor control for a motor controlled by the electrical logic control device The motor controlled by the logic control device provides safety-related motor control; and the digital input / output connection includes isolation between digital input / output information from the non-safety logic controller module and digital input / output information from the safety logic controller module or from the optional safety logic controller module, and wherein the signaling from the safety logic controller module and the signaling from the non-safety logic controller module are configured so that when the port is configured to be used by one of the safety logic controller module or the non-safety logic controller module, the pin corresponding to the port is configured to a "high" state by the safety logic controller module or the other of the non-safety logic controller module, or respectively wherein the signaling from the optional safety logic controller module and the signaling from the non-safety logic controller module are configured so that when the port is configured to be used by one of the optional safety logic controller module or the non-safety logic controller module, the pin corresponding to the port is configured to a "high" state by the optional safety logic controller module or the other of the non-safety logic controller module.

[0021] In a preferred embodiment, the apparatus comprises an optional safety logic controller module connected to said safety logic interface.

[0022] In a preferred embodiment, the isolation comprises an isolator.

[0023] In a preferred embodiment, the digital input / output is buffered.

[0024] In a preferred embodiment, the digital input / output is buffered by means of two diodes connected to the digital input / output connections.

[0025] Furthermore, a new electrical logic control device is proposed which comprises the input / output facility of the invention.

[0026] In a preferred embodiment, the electrical logic control device is a frequency converter.

[0027] Furthermore, a new optional safety logic controller module is proposed, which is configured to be connected to the safety logic interface of the electrical logic control device of the present invention.

[0028] In a preferred embodiment of the electrical logic control device, the electrical logic control device is a printed circuit board connectable to the safety logic interface. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In the following, the present invention will be described in more detail by way of examples and with reference to the accompanying drawings, in which:

[0030] Figure 1 The figure shows an input / output facility arrangement in an electrical logic control device according to the prior art.

[0031] Figure 2 An embodiment of an input / output facility means in an electrical logic control device according to the present invention is shown.

[0032] Figure 3 An embodiment of digital input signaling of an input / output facility device in an electrical logic control apparatus according to the present invention is illustrated.

[0033] Figure 4 An embodiment of digital output signaling of an input / output facility device in an electrical logic control device according to the present invention is illustrated.

[0034] Figure 5 Another embodiment of digital input signaling of an input / output facility device in an electrical logic control device according to the present invention is shown.

[0035] Figure 6 Another embodiment of the digital output signaling of the input / output facility means in the electrical logic control device according to the present invention is shown.

[0036] Figure 7 Another embodiment of the input / output facility means in the electrical logic control device according to the present invention is shown.

[0037] The foregoing aspects, features and advantages of the present invention will be apparent from the accompanying drawings and its associated detailed description.

[0038] As mentioned earlier Figure 1 In the following, reference will be made to Figures 2 to 7 The accompanying drawings describe the invention in more detail by means of preferred embodiments. DETAILED DESCRIPTION

[0039] An input / output facility device in an electrical logic control device according to an embodiment of the present invention comprises an input / output facility device in an electrical logic control device, the device comprising: digital input / output connections arranged for safety-related input / output and for non-safety-related input / output, a non-safety logic controller module connected to the digital input / output connections and configured to transmit signaling to or from the digital input / output connections, the non-safety logic controller module being configured to provide non-safety-related motor control for a motor controlled by the electrical logic control device, and a safety logic controller module or a safety logic interface, connected to the digital input / output connection, the safety logic interface is configured to receive an optional safety logic controller module, wherein: the safety logic controller module or the optional safety logic controller module is configured to transmit signaling to or from the digital input / output connection and is configured to provide safety-related motor control for a motor controlled by the electrical logic control device; and the digital input / output connection includes isolation between digital input / output information from the non-safety logic controller module and digital input / output information from the safety logic controller module or from the optional safety logic controller module.

[0040] When the term "input / output facility device" is mentioned, in this application it refers to a conventional I / O interface of an electrical logic control device.

[0041] When referring to the term "digital input / output connection", in this application it refers to a conventional digital I / O interface connection of an electrical logic control device.

[0042] When referring to the term "non-safety logic controller module", in this application it refers to a conventional controller unit module adapted to control and communicate non-safety logic information, said module comprising non-safety logic as well as standard non-safety level controller units.

[0043] When the term "safety logic controller module" is mentioned, in this application, it refers to a controller unit module suitable for controlling and transmitting non-safety logic information, which module includes safety logic and safety level controller units. The safety logic controller module is usually integrated into the electrical logic control device as an integrated module. The term "optional safety logic controller module" refers to a safety logic controller module that can be used as an additional module to supplement the electrical logic control device. Among them, "safety logic interface" refers to the interface of the electrical logic control device to which the optional safety logic controller module can be connected.

[0044] When the term "motor control" is referred to, in this application it refers to control signaling typically transmitted by an electrical logic control device, typically by a controller unit of the electrical logic control device.

[0045] Figure 2 An embodiment of an input / output facility device in an electrical logic control device according to the present invention is illustrated. The embodiment of the present invention includes an input / output facility 100, which includes a digital input / output connection with isolation 11, and the isolation 11 is used for safety-related input / output and non-safety-related input / output. The input / output facility 100 of the electrical logic control device also includes a safety logic controller module 12 and a non-safety logic controller module 13. The digital input / output connection with isolation 11 is further connected to the safety logic controller module 12. The safety logic controller module 12 includes a safety logic and safety level controller, namely a FS MCU (FS MCU, functional safety microcontroller unit). The safety logic controller module 12 provides safety-related motor control 14 for the motor controlled by the electrical logic control device.

[0046] The digital input / output connection with isolation 11 is further connected to the non-safety logic controller module 13. The non-safety logic controller module 13 comprises a non-safety logic and a non-safety level controller, i.e. an MCU (MCU, microcontroller unit). In the proposed embodiment, the input / output facility 100 comprises the safety logic controller module 12 and the non-safety logic controller module 13 as one integrated entity.

[0047] In the digital input / output connection with isolation 11, the isolation is arranged so that the isolation provides separation between the non-safety logic controller module 13 and the safety logic controller module 12. In the digital input / output connection with isolation 11, the isolation is arranged so that the digital input / output information from the non-safety logic controller module 13 does not affect the safety logic of the safety logic controller module 12. The non-safety logic controller module 13 provides non-safety related motor control 14 for the motor controlled by the electrical logic control device.

[0048] Figure 3 An embodiment of the digital input signaling of the input / output facility means in the electrical logic control device according to the present invention is illustrated. The proposed embodiment of the digital input signaling of the input / output facility 20 of the electrical logic control device comprises a digital input connection with isolation 21. The digital input connection with isolation 21 drives the input signal to the safety logic controller module 12 and the non-safety logic controller module 13.

[0049] In the proposed embodiment, the digital input connections with isolation 21 are buffered. Furthermore, in the proposed embodiment, the isolation is performed by implementing the signal path so that the buffering is always "stronger" than either the safety logic controller module 12 input / output or the non-safety logic controller module 13 input / output when viewed from the input of the other of the safety logic controller module 12 and the non-safety logic controller module 13. In the proposed embodiment, the isolation ensures that neither the safety logic controller module 12 nor the non-safety logic controller module 13 can modify the value observed by the other.

[0050] Figure 4 An embodiment of the digital output signaling of the input / output facility means in the electrical logic control device according to the invention is illustrated. The proposed embodiment of the digital output signal of the input / output facility 30 of the electrical logic control device comprises a digital output connection with isolation 31. The output signal to the digital output connection with isolation 31 is arranged both from the safety logic controller module 12 and from the non-safety logic controller module 13.

[0051] In the proposed embodiment, the digital output signals from the safety logic controller module 12 and from the non-safety logic controller module 13 are combined with an AND operator, that is, they are ANDed together. In addition, the safety logic controller module 12 and the non-safety logic controller module 13 are configured so that when one of the safety logic controller module 12 and the non-safety logic controller module 13 is configured as a port, the other configures the corresponding pin to a "high" state.

[0052] In the proposed embodiment, if the output is used for non-safety-related purposes (NSR), the safety logic controller module 12 considers it unused and drives its respective control to "high", and ensures that the non-safety logic controller module 13 has control of the output. Similarly, if the output is used for safety-related purposes (SR), the non-safety logic controller module 13 considers it unused and drives its respective control to "high", and ensures that the safety logic controller module 12 has control of the output. In both cases, if there is a safety-related (SR) reason for the signal to be pulled low, such as a function request in the safety-related safety logic controller module 12, the non-safety-related non-safety logic controller module 13 cannot interfere with the safety-related output signal.

[0053] Figure 5 Another embodiment of the digital input signaling of the input / output facility means in the electrical logic control device according to the present invention is illustrated. Another proposed embodiment of the digital input signaling of the input / output facility 40 of the electrical logic control device comprises a digital input connection with isolation 41. Said digital input connection with isolation 41 drives the input signal from the digital input / output connection 41 to the input 42 of the safety logic controller module and the input 43 of the non-safety logic controller module, i.e. to the input 42 of the FS MCU and the input 43 of the MCU. In another proposed embodiment, the digital input with isolation 41 is buffered by means of two diodes 45, 46 connected to the digital input / output connection 41.

[0054] In addition, Figure 5 In another proposed embodiment, the input / output facility device 40 includes an isolator 44 as an additional element. In another proposed embodiment, the isolator 44 is an additional element that provides further isolation. The input / output facility device 40 also includes a data isolation block 47 arranged between the input 42 of the safety logic controller module and the input 43 of the non-safety logic controller module. The data isolation block 47 is configured to isolate the FS MCU input 42 and the MCU input 43 from each other. Figure 5 In another proposed embodiment, the configuration of the data isolation block 47 is performed so that the buffering is always "stronger" than any one of the FS MCU input / output or the MCU input / output when observed from the other input of the FS MCU and the MCU. In another proposed embodiment, the data isolation block 47 ensures that neither the FS MCU nor the MCU can modify the value observed by the other. There are several possibilities to configure the data isolation block 47. One possible solution to configure the above data isolation block 47 is to use resistors with appropriately selected resistor values ​​before the FS MCU input / output and the MCU input / output. Figure 5In another embodiment, the input / output facility device 40 further includes a resistor R1.

[0055] Figure 6 Another embodiment of the digital output signaling of the input / output facility means in the electrical logic control device according to the present invention is illustrated. Another proposed embodiment of the digital output signal of the input / output facility 50 of the electrical logic control device includes a digital output connection with isolation 51. In another proposed embodiment, the output signal to the digital output with isolation 51 comes from both the output 52 of the safety logic controller module and the output 53 of the non-safety logic controller module, i.e., from the output 52 of the FS MCU and from the output 53 of the MCU. In another proposed embodiment, a MOSFET 56 (MOSFET, Metal Oxide Semiconductor Field Effect Transistor) is connected to the digital input / output connection through isolation 51. In one embodiment, the MOSFET 56 can be an enhancement mode p-channel MOSFET.

[0056] In the proposed embodiment, the input / output facility device 50 also includes a data isolation block 55 arranged between the output 52 of the safety logic controller module and the output 53 of the non-safety logic controller module. The data isolation block 55 is configured to isolate the FS MCU output 52 and the MCU output 53 from each other. There are several possibilities for configuring the data isolation block 55. One possible solution for the configuration of the data isolation block 55 is that the digital output signals from the FS MCU output 52 and from the MCU output 53 are combined with an AND operator 55, i.e. the digital output signals are ANDed together. In addition, the signaling from the FS MCU output 52 and the MCU output 53 can be configured so that when one port is configured to be used by one of the FSMCU and the MCU, the other configures the corresponding pin to a "high" state.

[0057] In addition, Figure 6 In another proposed embodiment, the input / output facility device 50 includes an isolator 54 as an additional element. In another proposed embodiment, the isolator 54 is an additional element that provides further isolation. Figure 6 In another proposed embodiment, the input / output facility device 50 further includes resistors R2, R3, R4, R5 and R6.

[0058] In the proposed embodiment, if the output is for non-safety related (NSR) use, the FS MCU considers it unused and drives its respective control to "high" and ensures that the MCU has control of the output. Similarly, if the output is for safety related (SR) use, the MCU 16 considers it unused and drives its respective control to "high" and ensures that the FS MCU has control of the output. In both cases, if there is a safety related (SR) reason to pull the signal low, such as a function request in the safety related FS MCU, the non-safety related MCU cannot interfere with the safety related output signaling.

[0059] Figure 7 Another embodiment of an input / output facility arrangement in an electrical logic control device according to the invention is illustrated. Another proposed embodiment comprises an input / output facility 60 of an electrical logic control device comprising digital input / output connections for safety-related input / outputs and for non-safety-related input / outputs with isolation 11. The input / output facility 60 of the electrical logic control device further comprises a safety logic interface 61 and a non-safety logic controller module 13.

[0060] In another proposed embodiment, the digital input / output connection with isolation 11 is further connected to the safety logic interface 61. The digital input / output connection 11 is further connected to the non-safety logic controller module 13. The non-safety logic controller module 13 includes a non-safety logic and a non-safety level controller, i.e., an MCU (MCU, microcontroller unit). In the proposed embodiment, the input / output facility 60 includes the non-safety logic controller module 13 as an integrated entity.

[0061] In another proposed embodiment, the safety logic interface 61 is arranged and configured to receive an optional safety logic controller module 62. The optional safety logic controller module 62 is arranged and configured to be connected to the safety logic interface 61 and comprises a safety logic and safety level controller, i.e. a FS MCU (FS MCU, functional safety microcontroller unit). The optional safety logic controller module 62 may be a printed circuit board that can be connected to the safety logic interface 61.

[0062] In another proposed embodiment, when an optional safety logic controller module 62 has been connected to the safety logic interface 61, the digital input / output connections with isolation 11 are also connected to the safety logic of the optional safety logic controller module 62 via the safety logic interface 61. The optional safety logic controller module 62 provides safety-related motor control for the motor controlled by the electrical logic control device.

[0063] In another proposed embodiment, the digital input / output connection with isolation 11 is further connected to the non-safety logic controller module 13. The non-safety logic controller module 13 comprises a non-safety logic and a non-safety level controller, ie MCU (MCU, Microcontroller Unit).

[0064] In the digital input / output connection with isolation 11, the isolation is arranged so that the isolation provides separation between the non-safety logic controller module 13 and the optional safety logic controller module 62. In the digital input / output connection with isolation 11, the isolation is arranged so that the digital input / output information from the non-safety logic controller module 13 does not affect the safety logic of the optional safety logic controller module 62. The non-safety logic controller module 13 provides non-safety related motor control for the motor controlled by the electrical logic control device.

[0065] The invention makes it possible to combine input signals and output signals of safety-related and non-safety-related signaling in a manner that complies with standards.

[0066] The invention also provides improved flexibility in how to distribute input signals in an electrical logic control device, such as a frequency converter.

[0067] The present invention also provides more freedom in the design of the electrical logic control device, thereby reducing the space required inside the electrical logic control device.

[0068] The solution according to the invention provides an effective and elegant solution for electrical logic control devices with advanced, flexible and safe input / output facilities compared to current prior art solutions.

[0069] It should be understood that the above description and accompanying drawings are intended only to teach the best methods known to the inventors to make and use the present invention. It will be apparent to those skilled in the art that the inventive concept can be implemented in various ways. Therefore, the above-described embodiments of the present invention may be modified or varied without departing from the present invention, as will be appreciated by those skilled in the art in light of the above teachings. Therefore, it should be understood that the present invention and its embodiments are not limited to the above-described examples, but may vary within the scope of the claims and their equivalents.

Claims

1. An input / output facility device (20, 30, 40, 50, 60, 100) in an electrical logic control device, the device comprising: Digital input / output connections (11, 41, 51), arranged for safety-related input / outputs and for non-safety-related input / outputs, a non-safety logic controller module (13) connected to the digital input / output connection (11, 41, 51) and configured to transmit signaling to or from the digital input / output connection (11, 41, 51), the non-safety logic controller module (13) being configured to provide non-safety related motor control (14) for a motor controlled by the electrical logic control device, a safety logic controller module (12) or a safety logic interface (61) connected to the digital input / output connection (11, 41, 51), the safety logic interface (61) being configured to receive an optional safety logic controller module (62), and data isolation (55), wherein digital output signals from the non-safety logic controller module (13) and from the safety logic controller module (12) or from the optional safety logic controller module (62) are combined with an AND operator, in: The safety logic controller module (12) or the optional safety logic controller module (62) is configured to transmit signaling to or from the digital input / output connection (11, 41, 51) and is configured to provide the safety-related motor control (14) for a motor controlled by the electrical logic control device; and The digital input / output connection (11, 41, 51) includes isolation between digital input / output information from the non-safety logic controller module (13) and digital input / output information from the safety logic controller module (12) or from the optional safety logic controller module (62), and: wherein the signaling from the safety logic controller module (12) and the signaling from the non-safety logic controller module (13) are configured such that: when a port is configured to be used by one of the safety logic controller module (12) and the non-safety logic controller module (13), a pin corresponding to the port is configured to a "high" state by the other of the safety logic controller module (12) and the non-safety logic controller module (13), or separately The signaling from the optional safety logic controller module (62) and the signaling from the non-safety logic controller module (13) are configured such that: when a port is configured to be used by one of the optional safety logic controller module (62) and the non-safety logic controller module (13), the pin corresponding to the port is configured to a "high" state by the other of the optional safety logic controller module (62) and the non-safety logic controller module (13).

2. The device according to claim 1, comprising an optional safety logic controller module (62), which is connected to the safety logic interface (61).

3. An apparatus according to claim 1 or 2, wherein the isolation comprises an isolator (44, 54).

4. The device according to any one of claims 1 to 3, wherein the digital input / output (11, 41, 51) is buffered.

5. The device according to claim 4, wherein the digital input / output (41) is buffered by means of two diodes (45, 46) connected to the digital input / output connection (41).

6. An electrical logic control device comprising an input / output facility (20, 30, 40, 50, 60, 100) according to any one of claims 1 to 5.

7. The electrical logic control device according to claim 6, wherein the electrical logic control device is a frequency converter.

8. An optional safety logic controller module (62) configured to be connected to a safety logic interface (61) of an electrical logic control device according to claim 6 or 7.

9. The optional safety logic controller module (62) according to claim 8, wherein the electrical logic control device is a printed circuit board connectable to the safety logic interface (61).

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