MODBUS RTU 4 into four modules Relay Module RS485 switch input and output PLC | Электронные компоненты и

MODBUS RTU 4 into four modules Relay Module RS485 switch input and output PLC | Электронные компоненты и

4 opto-isolated inputs for dry contact input switch, not with a voltage.4 10A high current relays. Using RS485 interfaces, protocols used industrially popular MODBUS RTU protocol. It can be easily embedded on the RS485 bus.An RS485 bus can connect 32 modules,Software set address and other parameters.Address and other parameters are stored in EEPROM.Provides sample source code control.Standard industrial rail mounting.Anti aspiration design. No aspiration power. MODBUS standard provides test software. Wide power supply 9-24V supply.

First, the wiring instructions

GND -------- to NO1 ---- The first group normally open relay

+ 12V ------- 12V COM1 --- first set relay common

485A ------- RS485 positive NC1 ---- The first group of relay normally closed

485B ------- RS486 negative NO2 ---- second group relay normally open

IN1 -------- first set of digital input COM2 ---- second set relay common

IN2 -------- second set of digital inputs NC2 ---- second group of relay normally closed

IN3 -------- third set of digital inputs NO3 ---- The third group relay normally open

IN4 -------- Group 4 digital input COM3 ---- third set relay common

NC --------- empty, do not use NC3 ------- third group relay normally closed

NO4 ------- fourth group of normally open relay

COM4 ------ fourth set relay common

NC4 ------- fourth group relay normally closed

One,Software Agreement

9600 baud, A start bit, 8 data bits, one stop bit, check bit is invalid. Default mailing address 0x01. In line with MODBUS RTU protocol specification.

Detailed instructions (with address 0x10 for example)

1, reads the digital input.

Send command format: Address (1 byte) + command (one byte) + register address (two bytes) + data field (two bytes) + CRC check code (two bytes).

Data Returned Format: Address (1 byte) + command (one byte) + Returns the number (1 byte) + return data (one byte) + CRC check code (two bytes) Byte

Send:0x01, 0x02, x00, 0x20, 0x00, 0x04, 0x78, 0x03

Returns:0x01, 0x02, x01, 0x0F, 0xE1,0x8c

ReturnReturn0x0F,This module only low 4, only care about the low four. From the first to the first4, respectively, digital input status INPUT1 to INPUT4 when there is digital input signal, the corresponding bit is 0 if the first channel switch input, there is no other way switch input, the value 0x0E.

2,Control relay output.

2.1 a control individual relay (assuming the module 0x01)

Opened the first road 0x01,0x05,0x00,0x10,0xFF, 0x00,0x8D, 0xFF

To open the second road 0x01,0x05,0x00,0x11,0xFF, 0x00,0xDC, 0x3F

Open the third way 0x01,0x05,0x00,0x12,0xFF, 0x00,0x2C, 0x3F

Open fourth road 0x01,0x05,0x00,0x13,0xFF, 0x00,0x7D, 0xFF,

Off the first road 0x01,0x05,0x00,0x10,0x00,0x00,0xCC, 0x0F

Off the second road 0x01,0x05,0x00,0x11,0x00,0x00,0x9D, 0xCF

Off Third Road 0x01,0x05,0x00,0x12,0x00,0x00,0x6D, 0xCF

Off fourth road 0x01,0x05,0x00,0x13,0x00,0x00,0x3C, 0x0F

2.2 all in one operation relay

Open all0x01,0x0F, 0x00,0x10,0x00,0x04,0x01,0x0F, 0xBF, 0x51

Off all0x01,0x0F, 0x00,0x10,0x00,0x04,0x01,0x00,0xFF, 0x55

Set to open a two-way, set thirty-four way off0x01,0x0F, 0x00,0x10,0x00,0x04,0x01,0x03,0xBF, 0x54

Set a Road Off Road set thirty-four open 0x01,0x0F, 0x00,0x10,0x00,0x04,0x01,0x0C, 0xFF, 0x50

3,Read relay output status

SendInstruction formatFormula: Address (1 byte) + commands (one byte) + register address (two bytes) + data field (two bytes) + CRC check code (two bytes).

Data Returned Format: Address (1 byte) + command (one byte) + Returns the number (1 byte) + return data (one byte) + CRC check code (two bytes) Byte

Send:0x01,0x01, x00,0x10,0x00,0x04,0x3c, 0x0c

Returns:0x01, 0x01, x01,0x00,0x51,0x88

ReturnBack 0x00, status output relay, 0 is off, 1 is energized. This module only low 4, only care about the low four.

4,Setting the module address

WillDevice Address changed01: 0x00,0x06,0x00,0x01,0x00,0x01,0x18,0x1b

This product is absolutely can connect PLC, we know PLC supports MODBUS RTU protocol, the following test software with MODBUS Modbus Poll test communications.

Control Relay

Read switch

Provide C ++ code design reference, here is a program that provides an interface reference

This interface provides the source code, powerful, able to modify the address of the device can operate various relays, as well as reading the digital inputs can read the relay is energized or closed. Also calculates the CRC value, and can display the data returned by the device, the software during installation can be directly used to test equipment that allows the installer after installation, immediately to test whether the device is installed properly, greatly facilitate device installation and maintenance.

Physical map

Invoice: a finished, without power, data photographed by mail sent.