IO input circuit system of Fenake numerical control system

Abstract

The invention relates to an IO input circuit system of a Fenake numerical control system. The IO input circuit system comprises an IO unit input interface, a machine tool side switching signal set and a current detection protection device. The IO input circuit can effectively solve the problems that in an IO input circuit of an existing Fenake numerical control system, a plurality of machine tool side switching signal sets share one 1A large fuse, when a loop where any switching signal is located is short-circuited, a failed switching signal loop cannot be judged, time and labor are consumed in maintenance, and the failure rate is high. And the normal operation and the maintenance efficiency of the equipment are seriously influenced.

Description

Technical Field

[0001] This invention relates to the field of machine tools, and more particularly to an I / O input circuit system for a FANUC CNC system. Background Technology

[0002] In the existing FANUC CNC system's I / O input circuit, multiple machine tool-side switch signal groups share a single 1A fuse. A short circuit in any of these switch signal circuits will directly cause the fuse to blow. Due to the lack of an independent fault detection mechanism, maintenance requires checking all switch signal circuits one by one. This is especially time-consuming and labor-intensive for intermittent short circuit faults, necessitating multiple fuse replacements to pinpoint the problem, severely impacting equipment maintenance efficiency and normal operation.

[0003] The main drawbacks of existing technologies include: difficulty in fault location: single-fuse protection cannot distinguish the specific short-circuited switch signal circuit; high maintenance costs: frequent fuse blowouts lead to frequent replacement of consumables; and long downtime: the troubleshooting process is complex and prolongs the equipment fault recovery cycle. Summary of the Invention

[0004] The purpose of this invention is to provide an IO input circuit system for a FANUC CNC system, which solves the problem that in the existing IO input circuit of FANUC CNC systems, multiple machine tool-side switch signal groups share a single 1A fuse. When a short circuit occurs in any switch signal circuit, it is impossible to determine the faulty switch signal circuit, resulting in time-consuming and labor-intensive repairs, which seriously affects the normal operation and maintenance efficiency of the equipment.

[0005] The technical solution adopted by this invention to solve its technical problem is: an IO input circuit system for a FANUC CNC system, including an IO unit input interface, a machine tool-side switch signal group, and a current detection and protection device. The I / O unit input interface includes a high-level signal output interface, a low-level signal output interface, and a set of I / O signal input interfaces. The high-level signal output interface is connected to a 1A fuse. The machine tool-side switch signal group includes a set of switch signals, with each switch signal's output interface and I / O signal input interface connected one-to-one. The current detection and protection device is equipped with a high-level signal input interface, a low-level signal input interface, and a set of protection signal output interfaces. The high-level signal input interface is connected to the high-level signal output interface in the IO unit input interface, and the low-level signal input interface is connected to the low-level signal output interface. The protection signal output interface is connected to the input terminal interface of the switch signal in a one-to-one correspondence. Each current detection module includes a sampling resistor R1, a control chip U1, a MOSFET Q1, an auxiliary capacitor C1, an auxiliary resistor R2, and a reset button SB. One end of the sampling resistor R1, the drain of the MOSFET Q1, and the OUT pin of the control chip U1 are connected to a protection output interface; the other end of the sampling resistor R1 is connected to the auxiliary capacitor C1; the other end of the auxiliary capacitor C1, the GND pin of the control chip U1, and one end of the auxiliary resistor R2 are connected to a low-level signal input interface; the other end of the auxiliary resistor R2 is connected to the gate of the MOSFET Q1; the source of the MOSFET Q1, the IN pin of the control chip U1, and the high-level signal input interface are connected; the gate of the MOSFET Q1 is connected to the GATE pin of the control chip U1; the VSS pin of the control chip U1 is connected between the sampling resistor R1 and the auxiliary capacitor C1; and the reset button SB is connected between the OFF pin of the control chip U1 and the low-level signal input interface.

[0006] Furthermore, each current detection module is also equipped with an indicator LED. The indicator LED is connected between the gate of the MOSFET Q1 and the auxiliary resistor R2. The positive terminal of the indicator LED is connected to the gate of the MOSFET Q1, and the negative terminal of the indicator LED is connected to the auxiliary resistor R2.

[0007] Furthermore, MOSFET Q1 is an AO3400 enhancement-mode MOSFET, sampling resistor R1 is a metal film resistor, and control chip U1 is an LM5050-1.

[0008] Furthermore, it also includes an interface converter, which is equipped with a set of input / output interfaces for connecting the machine tool-side switch signal group and the IO input interface in a one-to-one correspondence.

[0009] The beneficial effects of this invention are as follows: By setting up a current detection protection device, and setting up multiple sets of current detection modules within it, each corresponding to an IO signal input interface and a switch signal, the protection and independent status of each switch signal's return path can be achieved. This effectively solves the problem in the existing FANUC CNC system's IO input circuit system where each switch signal in the machine tool side switch signal group shares a large 1A fuse. When a short circuit occurs in any switch signal's circuit, it is impossible to determine the circuit where the faulty switch signal is located, resulting in time-consuming and labor-intensive repairs that seriously affect the normal operation and maintenance efficiency of the equipment.

[0010] By setting a reset button, single-point fault diagnosis can be achieved.

[0011] Each current detection module shares the electrical signal provided by the IO unit input interface and retains a large 1A fuse, which can achieve dual protection.

[0012] The indicator LEDs allow for precise location of corresponding current detection modules and accurate identification of short circuits in the circuits containing associated switch signals. When a fault occurs, it eliminates the need to individually check each circuit in the machine tool's switch signal group, significantly improving maintenance efficiency and reducing difficulty. Fault location and recovery processes no longer require repeated replacement of large 1A fuses, greatly reducing machine downtime, effectively improving production efficiency, and lowering production costs.

[0013] It can reduce the wear and tear of large 1A fuses and extend the service life of machine tool I / O modules.

[0014] The present invention will now be described in more detail with reference to the accompanying drawings and embodiments. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the circuit of the present invention.

[0016] Figure 2 This is a circuit diagram of a current detection and protection device. All current detection modules are identical, so only the specific circuit of one of the current detection modules is shown in detail in the diagram.

[0017] In the diagram, 1. IO unit input interface, 2. Interface converter, 3. Machine tool side switch signal group, 4. Current detection and protection device, 5. High-level signal output interface, 6. Low-level signal output interface, 7. IO signal input interface, 8. Large 1A fuse, 9. High-level signal input interface, 10. Low-level signal input interface, 11. Protection signal output interface, 12. Current detection module, 13. Switch signal. Detailed Implementation

[0018] Examples, such as Figure 1 , Figure 2 The diagram shows an I / O input circuit system for a FANUC CNC system, including an I / O unit input interface 1, a machine tool-side switch signal group 3, and a current detection and protection device 4. The I / O unit input interface 1 includes a high-level signal output interface 5, a low-level signal output interface 6, and a set of I / O signal input interfaces 7. The high-level signal output interface 5 is connected to a 1A fuse 8. The machine tool side switch signal group 3 includes a set of switch signals 13, and the output terminal interface of each switch signal 13 is connected to the IO signal input interface 7 in a one-to-one correspondence. The current detection and protection device 4 is equipped with a high-level signal input interface 9, a low-level signal input interface 10, and a set of protection signal output interfaces 11. The high-level signal input interface 9 is connected to the high-level signal output interface 5 in the IO unit input interface 1, and the low-level signal input interface 10 is connected to the low-level signal output interface 6. The protection signal output interface 11 is connected to the input terminal interface of the switch signal 13 in a one-to-one correspondence. Each current detection module 12 includes a sampling resistor R1, a control chip U1, a MOSFET Q1, an auxiliary capacitor C1, an auxiliary resistor R2, and a reset button SB. One end of the sampling resistor R1, the drain of the MOSFET Q1, and the OUT pin of the control chip U1 are connected to a protection output interface; the other end of the sampling resistor R1 is connected to the auxiliary capacitor C1; the other end of the auxiliary capacitor C1, the GND pin of the control chip U1, and one end of the auxiliary resistor R2 are connected to the low-level signal input interface 10; the other end of the auxiliary resistor R2 is connected to the gate of the MOSFET Q1; the source of the MOSFET Q1, the IN pin of the control chip U1, and the high-level signal input interface 9 are connected; the gate of the MOSFET Q1 is connected to the GATE pin of the control chip U1; the VSS pin of the control chip U1 is connected between the sampling resistor R1 and the auxiliary capacitor C1; and the reset button SB is connected between the OFF pin of the control chip U1 and the low-level signal input interface 10.

[0019] Each current detection module 12 is also equipped with an indicator LED. The indicator LED is connected between the gate of the MOSFET Q1 and the auxiliary resistor R2. The positive terminal of the indicator LED is connected to the gate of the MOSFET Q1, and the negative terminal of the indicator LED is connected to the auxiliary resistor R2.

[0020] The MOSFET Q1 is an AO3400 enhancement-mode MOSFET, the sampling resistor R1 is a metal film resistor, and the control chip U1 is an LM5050-1.

[0021] The IO input circuit system of the Benfanuc CNC system also includes an interface converter 2, which is equipped with a set of input / output interfaces for connecting the machine tool-side switch signal group 3 and the IO input interface in a one-to-one correspondence.

[0022] The number of current detection modules 12 is the same as the number of switch signals 13 and IO signal input interfaces 7, and the three are connected in a one-to-one correspondence.

[0023] The sampling resistor R1 is rated at 0.056Ω / 0.25W, the auxiliary capacitor C1 is rated at 10nF 50V, and the auxiliary resistor R2 is rated at 2.2kΩ / 0.25W. All current detection modules 12 share the +24V power supply output from the IO unit input interface 1 and the 0V ground.

[0024] Normal state: When the switch is closed, the voltage drop of sampling R1 is ≤50mV, the GATE pin of the control chip LM5050-1 outputs a high level, the MOSFET Q1 is turned on, the indicator LED is lit, and the signal is normally input to the machine tool's PLC.

[0025] Short circuit protection status: When an external signal is short-circuited, the current instantaneously exceeds the threshold, the voltage drop of the sampling resistor R1 is >50mV, the control circuit LM5050-1 shuts off the OUT pin, the MOSFET Q1 is cut off, the indicator LED goes out, and the fault circuit is cut off; if the control chip LM5050-1 fails, the 1A fuse of the machine tool switch side IO module blows as a backup protection, and all need to be checked.

[0026] When the switch is open: the current is 0A, the voltage drop across R1 is 0mV, the control chip LM5050-1 maintains a high level at GATE, the indicator LED lights up, and the machine tool's PLC detects a low level.

[0027] Reset mechanism: After troubleshooting, the SB manual reset button must be pressed to restore the conduction state of the corresponding circuit.

[0028] In the description of this invention, it should be understood that the terms "center," "lateral," "upper," "lower," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more. Additionally, the term "comprising" and any variations thereof are intended to cover non-exclusive inclusion.

[0029] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0030] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments. Unless the context clearly indicates otherwise, the singular forms “a” and “an” as used herein are also intended to include the plural. It should also be understood that the terms “comprising” and / or “including” as used herein specify the presence of the stated features, integers, steps, operations, units, and / or components, without excluding the presence or addition of one or more other features, integers, steps, operations, units, components, and / or combinations thereof.

[0031] The above embodiments are not intended to limit the scope of the invention, but rather to illustrate it. The scope of the invention is determined by the scope of the claims, not by the description itself, and should be interpreted as including all differences within the equivalent scope. Any non-substantial improvements made using the inventive concept and technical solutions, or the direct application of the above-described concepts and technical solutions of the invention to other situations without modification, are all within the protection scope of the invention.

Claims

1. An IO input circuitry of a Genesys numerical control system, characterized by: The IO unit input interface includes a high-level signal output interface, a low-level signal output interface, and a group of IO signal input interfaces, the high-level signal output interface is connected with a 1A fuse, The machine tool side switch signal group includes a group of switch signals, and the output end interfaces of the switch signals are connected with the IO signal input interfaces one by one, The current detection protection device is provided with a high-level signal input interface, a low-level signal input interface, and a group of protection signal output interfaces, the high-level signal input interface is connected with the high-level signal output interface in the IO unit input interface, the low-level signal input interface is connected with the low-level signal output interface, and the protection signal output interfaces are connected with the input end interfaces of the switch signals one by one; Each current detection module includes a sampling resistor (R1), a control chip (U1), a MOS tube (Q1), an auxiliary capacitor (C1), an auxiliary resistor (R2), and a reset button (SB), one end of the sampling resistor (R1), the drain of the MOS tube (Q1), and the OUT pin of the control chip (U1) are connected with a protection output interface; the other end of the sampling resistor (R1) is connected with the auxiliary capacitor (C1); the other end of the auxiliary capacitor (C1), the GND pin of the control chip (U1), one end of the auxiliary resistor (R2), and the low-level signal input interface are connected; the other end of the auxiliary resistor (R2) is connected with the gate of the MOS tube (Q1); the source of the MOS tube (Q1), the IN pin of the control chip (U1), and the high-level signal input interface are connected; the gate of the MOS tube (Q1) is connected with the GATE pin of the control chip (U1); the VSS pin of the control chip (U1) is connected between the sampling resistor (R1) and the auxiliary capacitor (C1); and the reset button (SB) is connected between the OFF pin of the control chip (U1) and the low-level signal input interface. Each current detection module is further provided with an indicator light (LED), the indicator light (LED) is connected between the gate of the MOS tube (Q1) and the auxiliary resistor (R2), the positive electrode of the indicator light (LED) is connected with the gate of the MOS tube (Q1), and the negative electrode of the indicator light (LED) is connected with the auxiliary resistor (R2).

2. The IO input circuitry of the Genesys numerical control system of claim 1, characterized by: The MOS tube (Q1) is an AO3400 enhanced MOS tube, the sampling resistor (R1) is a metal film resistor, and the control chip (U1) is an LM5050-1.

3. The IO input circuitry of the Genasys numerical control system of claim 2, wherein: The interface converter is further provided with a group of input and output interfaces for connecting the machine tool side switch signal group and the IO input interface one by one.

4. The IO input circuitry of the Genasys numerical control system of claim 3, wherein: ​

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