The main products

Spare parts spare parts, the DCS control system of PLC system and the robot system spare parts,

Brand advantage: Allen Bradley, BentlyNevada, ABB, Emerson Ovation, Honeywell DCS, Rockwell ICS Triplex, FOXBORO, Schneider PLC, GE Fanuc, Motorola, HIMA, TRICONEX, Prosoft etc. Various kinds of imported industrial parts

REM615 HCMJAEADABC2BNN11E Touch screen

Read Setpoints/Actual Values (Function Codes 03/04h) Modbus implementation: Read Input and Holding Registers PQMII Implementation: Read Setpoints and Actual Values For the PQMII Modbus implementation, these commands are used to read any setpoint (‘holding registers’) or actual value (‘input registers’). Holding and input registers are 16-bit (two byte) values with the high-order byte transmitted first. Thus, all setpoints and actual values are sent as two bytes. A maximum of 125 registers can be read in one transmission. Function codes 03 and 04 are configured to read setpoints or actual values interchangeably since some PLCs do not support both of them. The slave response to function codes 03/04 is the slave address, function code, number of data bytes to follow, the data, and the CRC. Each data item is sent as a 2 byte number with the high order byte first. Message Format and Example for Modbus Function Code 03/04h: Request slave 17 to respond with 3 registers starting at address 006B.

Supported Modbus Functions 

The following functions are supported by the PQMII: 03h: Read Setpoints and Actual Values 04h: Read Setpoints and Actual Values 05h: Execute Operation 06h: Store Single Setpoint 07h: Read Device Status 08h: Loopback Test 10h: Store Multiple Setpoints

Modbus Implementation: Force Single Coil PQMII Implementation: Execute Operation This function code allows the master to request a PQMII to perform specific command operations. The command numbers listed in the Commands area of the memory map correspond to operation codes for function code 05. The operation commands can also be initiated by writing to the Commands area of the memory map using function code 16. 7.2.9 Performing Commands (Function Code 10h) for complete details.