MOD BUS RTU Protocol 4 in 4 out Control Relay Module RS485 Switch Input And Output PLC Module

MOD-BUS RTU Protocol 4 in 4 out Control Relay Module RS485 Switch Input And Output PLC Module

Specifications:

4 photoelectric isolation input, for dry node input switch quantity, not with voltage. 4 10A high current relay output. UseRS485 interfaceThe agreement is used in industry. MODBUS RTU protocol. It can be easily embedded in the RS485 bus. A RS485 bus can be connected to 32 modules. The software set the address and other parameters. The address and other parameters are stored in the EEPROM. Providing control sample source. Standard industrial guideway installation. Anti mistaken design. Electricity without mistake. Providing MODBUS Standard Test Software. Wide power supply 9-24V power supply. The baud rate 1200-19200 can be set up (parity check is not set, no check communication mode).

 

1. Connection instructions

GND- ----- land(power negative)NO1---- the first set of relays is often open

VCC-------9 to 24V (power cathode)COM1--- first set of relay public end

485A-------RS485 NC1---- is the first group of relay normally closed.

485B-------RS486 negative NO2---- second groups of relay are always open.

IN1-------- first set of switch input COM2---- second sets of relay common end

IN2-------- second sets of switch input NC2---- second relay normally closed.

IN3-------- third sets of switch input NO3---- third groups of relay normally open.

IN4-------- fourth sets of switch input COM3---- third sets of relay common end

NC--------- empty, not using NC3------- third sets of relay normally closed.

NO4------- fourth sets of relays are often open

COM4------ fourth set of relay public ends

NC4------- fourth sets of relays are often closed

 

1. Software protocol

The default baud rate is 9600, one starting bit, 8 data bits, one stop bit, and invalid bit. The default communication address 0x01. The protocol conforms to the MODBUS RTU specification.

 

This product can definitely connect to PLC. We know that PLC supports MODBUS RTU protocol, and the following is the Modbus Poll test communication using MODBUS's test software.

 

Control relay

Read switch quantity

Provide C++ reference code design, the following is the interface to provide reference program.

 

 The interface provides source code, powerful, able to modify the device's address, to operate the various relays, and to read the switch input, and to read whether the relay is absorbing or closing. It can also calculate the CRC check value, and can display the data returned by the device. This software can be used to test the equipment directly in the installation process, so that the installation personnel can test the installation of the equipment immediately after installation, which greatly facilitates the installation and maintenance of the equipment.

 

 

 

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