Card type temperature controller

Abstract

The utility model discloses a card type temperature controller, which is characterized by comprising a shell, and a power supply module, a main control chip, an RS485 communication module, an input / output interface, a display module and an operation module which are integrated in the shell, the input / output interface comprises a plurality of paths of temperature sensor input terminals and a plurality of paths of relay output terminals, and the display module is provided with a state indicating lamp group. According to the card type temperature controller, the power supply module, the main control chip, the RS485 communication module, the input / output interface, the display module and the operation module are integrated, so that the highly integrated design of the temperature controller is realized, the equipment size is obviously reduced, the DIN35 guide rail can be conveniently and quickly mounted on an industrial site, and meanwhile, the wiring complexity of the system is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to temperature control instrument technical field, specifically relates to a card formula temperature control instrument. BACKGROUND

[0002] The precision, reliability and expansibility of temperature control equipment in the field of industrial automation are increasingly stringent. The traditional temperature control instrument generally has the following technical defects:

[0003] 1. Most of the temperature control equipment on the market adopts fixed channel design (usually only 1-2 input / output), which is difficult to meet the demand of modern industrial production line multi-measurement point cooperative control. For example, in the semiconductor manufacturing or chemical reaction kettle scene, it is often necessary to simultaneously monitor and adjust dozens of temperature zones independently, and the traditional equipment needs to be expanded through a complex peripheral circuit, resulting in increased cost and reduced system reliability.

[0004] 2. The existing equipment mostly adopts private communication protocol or single RS485 interface, which has the following limitations: it cannot be directly connected with mainstream control systems such as PLC and SCADA; the fixed baud rate (usually ≤9600bps) leads to low data transmission efficiency; and it lacks a verification mechanism (such as CRC verification missing), which is easily affected by electromagnetic interference and causes communication packet loss.

[0005] 3. The traditional instrument relies on single LED indicator light or nixie tube display, which has the following disadvantages: it cannot directly reflect the running state of multiple channels (such as temperature overrun and PID self-tuning process); it lacks fault diagnosis function (such as sensor disconnection and output short circuit); and parameter debugging needs to be operated through physical buttons, which is low in efficiency and easy to be mistaken. INVENTION CONTENT

[0006] In view of the deficiencies of the background art, the technical problem to be solved by the utility model is to provide a card formula temperature control instrument with multi-channel cooperative control, compatible with multiple types of temperature sensors, integrated Modbus-RTU communication, and visual state monitoring.

[0007] To this end, the utility model is implemented by adopting the following technical solutions:

[0008] A card formula temperature control instrument, characterized by: comprising a shell and a power module, a main control chip, an RS485 communication module, an input / output interface, a display module and an operation module integrated in the shell; the input / output interface comprises multiple temperature sensor input terminals and multiple relay output terminals, and the display module is provided with a state indicator light group.

[0009] Further, the number of temperature sensor input terminals is 4, and the temperature sensor input terminals support two types of thermocouple (K / E / J / S type) and thermal resistance (Pt100), and the wiring terminal definition is:

[0010] TC1+ / A1~TC4+ / A4: positive input terminal;

[0011] TC1- / B1~TC4- / B4: negative input terminal;

[0012] B1'~B4': common compensation terminal.

[0013] Further, the number of relay output terminals is 4, and the relay output terminal adopts the transistor NPN collector output form, which is specifically defined as:

[0014] YO-Y3: output control terminal (24VDC / 30mA);

[0015] GND: common ground terminal.

[0016] Further, the state indication lamp group includes:

[0017] PWR indication lamp: red, power status indication;

[0018] TX / RX indication lamp: green / red, communication transceiver status indication;

[0019] YO-Y3 indication lamp: green, output channel status indication;

[0020] AL / AH indication lamp: red, temperature alarm status indication.

[0021] Further, the operation module includes:

[0022] RST reset key: long press for 2 seconds to realize communication parameter reset;

[0023] ADDR address switch: set the slave address (0-15) through dial code;

[0024] RS485 terminal resistance switch: support 120Ω resistance switching.

[0025] Further, the main control chip is built-in PID control algorithm, the parameters of which are realized through register configuration, including:

[0026] P00-P03: proportional coefficient (0-9999);

[0027] I00-I03: integral time (0-9999 seconds);

[0028] D00-D03: differential time (0-9999 seconds);

[0029] OUTL / OUTH: output limiting amplitude (0-1000, corresponding to 0%-100%).

[0030] Further, the RS485 communication module supports Modbus-RTU protocol, and communication parameters can be configured through registers, including:

[0031] Baud rate: 4800~115200bps (register BAND RATE);

[0032] Check mode: no check / odd check / even check (register CHECK CODE);

[0033] Data bits: 8 bits, stop bits: 1 / 2 bits.

[0034] Further, the shell adopts a DIN35 guide rail mounting structure.

[0035] After the above technical scheme, by integrating the power module, the main control chip, the RS485 communication module, the input and output interface, the display module and the operation module, the high integration design of the temperature controller is realized, the equipment size is significantly reduced, the DIN35 guide rail is quickly installed in the industrial field, and the system wiring complexity is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0036] The utility model has the following drawings:

[0037] Figure 1 It is the structure schematic drawing of the utility model;

[0038] Figure 2 It is the wiring schematic drawing of the utility model and solid state relay, heating unit, temperature sensor;

[0039] Figure 3 It is the structure schematic drawing of the utility model installation in DIN35 guide rail installation. DETAILED DESCRIPTION

[0040] In order to further illustrate the technical means and effects adopted by the utility model to achieve the predetermined utility model purposes, the specific implementation, structure, features and effects according to the utility model are described in detail as follows in combination with the drawings and preferred embodiments.

[0041] Referring to the drawings shown above, the utility model provides a card type temperature controller, characterized by: including shell and integrated in the shell power module, main control chip, RS485 communication module, input and output interface, display module and operation module; the input and output interface includes multiple temperature sensor input terminals and multiple relay output terminals, and the display module is provided with a state indicating lamp group.

[0042] The temperature sensor input terminal quantity is 4 ways, and the temperature sensor input terminal supports thermocouple (K / E / J / S type) and thermal resistance (Pt100) two types, and its wiring terminal definition is:

[0043] TC1+ / A1~TC4+ / A4: positive input terminal;

[0044] TC1- / B1~TC4- / B4: negative input terminal;

[0045] B1'~B4': common compensation terminal.

[0046] The relay output terminal number is 4, and the relay output terminal adopts the transistor NPN collector output form, and is specifically defined as:

[0047] YO-Y3: output control terminal (24VDC / 30mA);

[0048] GND: common ground terminal.

[0049] The status indication lamp group comprises:

[0050] PWR indication lamp: red, power state indication;

[0051] TX / RX indication lamp: green / red, communication transceiver state indication;

[0052] YO-Y3 indication lamp: green, output channel state indication;

[0053] AL / AH indication lamp: red, temperature alarm state indication.

[0054] The operation module comprises:

[0055] RST reset key: long press 2 seconds to realize communication parameter reset;

[0056] ADDR address switch: set the slave address (0-15) through the code dialing;

[0057] RS485 terminal resistance switch: support 120Ω resistance switching.

[0058] The main control chip is built-in PID control algorithm, and the parameters are realized through register configuration, including:

[0059] P00-P03: proportional coefficient (0-9999);

[0060] I00-I03: integral time (0-9999 seconds);

[0061] D00-D03: differential time (0-9999 seconds);

[0062] OUTL / OUTH: output limiting amplitude (0-1000, corresponding to 0%-100%).

[0063] The RS485 communication module supports Modbus-RTU protocol, and the communication parameters can be configured through registers, including:

[0064] Baud rate: 4800~115200bps (register BAND RATE);

[0065] Check mode: no check / odd check / even check (register CHECK CODE);

[0066] Data bits: 8 bits, stop bits: 1 / 2 bits.

[0067] The shell adopts a DIN35 guide rail mounting structure.

[0068] In the embodiment, by integrating the power module, the main control chip, the RS485 communication module, the input and output interface, the display module and the operation module, the high integration design of the temperature controller is realized, the device volume is significantly reduced, the DIN35 guide rail is quickly installed in the industrial field, and the system wiring complexity is reduced; the power module provides a 24VDC working voltage, the main control chip is equipped with a PID algorithm processor, the RS485 communication module supports Modbus-RTU protocol, the input and output interface includes 4 temperature sensor input terminals and 4 relay output terminals, the display module includes a power indicator light (PWR), a communication indicator light (TX / RX), an output indicator light (YO-Y3) and an alarm indicator light (AL / AH), the operation module includes a reset button (RST), an address setting switch (ADDR) and a terminal resistor switch (RS485), the temperature controller has a temperature self-tuning function, the self-tuning program of the corresponding channel is started by writing registers AT=101-104, and after completion, the PID parameters are automatically saved to the non-volatile memory, the temperature controller is provided with a two-stage alarm protection mechanism: OL / OHL: lower limit temperature alarm (register OL=100 corresponds to 10.0℃), OH / OHH: upper limit temperature alarm (register OH=20 corresponds to 2.0℃), and the alarm output can be independently enabled through registers ALARM1 / ALARM2.

[0069] Supports thermocouple (K / E / J / S type, -50~1650℃) and thermistor (Pt100, -200~850℃) dual-type sensor input, cooperates with independent TC+ / TC- terminal design and B1'-B4' common compensation terminal, which not only ensures the accuracy of wide temperature range measurement (±0.5℃FS), but also improves the adaptability of the device to complex working conditions;

[0070] The relay terminal design of transistor NPN collector output (24VDC / 30mA) realizes the standard electrical connection with external actuators (such as heaters, valves) through the clear YO-Y3 output terminal and GND common terminal definition, effectively preventing control failure caused by wiring errors.

[0071] The multi-state indicator light group (PWR / TX / RX / YO-Y3 / AL / AH) directly reflects the power state, communication activity, output state and alarm information through red and green dual-color LEDs, so that the operation and maintenance personnel can quickly locate faults (such as AL light indicating temperature lower limit alarm) without relying on the host computer, significantly shortening equipment maintenance time.

[0072] The long-press reset function (2 seconds trigger communication parameter initialization) of the RST reset key and the tool-free configuration design of the dial switch (ADDR / RS485) realize tool-free debugging of device parameters; the terminal resistance switching function (RS485 terminal resistance switch) can optimize RS485 bus communication quality, especially suitable for long-distance industrial sites.

[0073] The built-in PID self-tuning algorithm (register AT=101-104) of the main control chip shortens the temperature control response time to 250ms / channel through automatic calculation of the best P / I / D parameters, and the output power can be finely adjusted (0-100% continuous adjustable), which improves the energy saving efficiency compared with traditional mechanical temperature controllers.

[0074] The RS485 communication module supporting Modbus-RTU protocol can be seamlessly connected with PLC and SCADA system, and the temperature value can be set remotely through the register (such as SV00-SV03), realizing network control of multiple devices and saving wiring cost.

Claims

1. A card-mounted temperature controller characterized by: The temperature sensor input terminal number is 4, and the temperature sensor input terminal supports thermocouple (K / E / J / S type) and thermal resistance (Pt100) two types, and the wiring terminal definition is as follows:

2. A card type temperature controller according to claim 1, wherein: TC1+ / A1~TC4+ / A4: positive input end; TC1- / B1~TC4- / B4: negative input end; B1'~B4': common compensation terminal. The relay output terminal number is 4, and the relay output terminal adopts the transistor NPN collector output form, and the specific definition is as follows:

3. A card type temperature controller according to claim 1, wherein: YO-Y3: output control end (24VDC / 30mA); GND: common ground end. The state indication lamp group comprises:

4. The card type temperature controller according to claim 1, wherein: PWR indication lamp: red, power state indication; TX / RX indication lamp: green / red, communication transceiver state indication; YO-Y3 indication lamp: green, output channel state indication; AL / AH indication lamp: red, temperature alarm state indication. The operation module comprises:

5. The card type temperature controller according to claim 1, wherein: RST reset key: long press 2 seconds to realize communication parameter reset; ADDR address switch: set the slave address (0-15) through the code dialing; RS485 terminal resistance switch: support 120Ω resistance switching. The PID control algorithm is built in the main control chip, and the parameters are realized through register configuration, including:

6. A card type temperature controller according to claim 1, wherein: P00-P03: proportional coefficient (0-9999); I00-I03: integral time (0-9999 seconds); D00-D03: differential time (0-9999 seconds); OUTL / OUTH: output limiting (0-1000, corresponding to 0%-100%). The RS485 communication module supports Modbus-RTU protocol, and the communication parameters can be configured through the register, including:

7. A card thermostat according to claim 1, characterized in that: Baud rate: 4800~115200bps (register BAND RATE); Verification mode: no check / odd check / even check (register CHECK CODE); Data bits: 8 bits, stop bits: 1 / 2 bits. The shell adopts DIN35 guide rail installation structure.

8. A card thermostat according to any one of claims 1 to 7, characterised in that: ​

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