Omron CJ2H-CPU6*-EIP Series Connection Guide

9
．
Program
40
9.1.1. Outline of Processing
The following figure shows the data flow from when PLC (SCU) issues command data to
Destination Device using serial communications (Modbus-RTU communication) until PLC
receives response data from Destination Device.
(1)The ladder program executes the deliver command instruction (CMND instruction) for
which Modbus-RTU communication is specified.
(2)The PLC sends the command data for reading "Direct I/O and electromagnetic brake
status" to Driver using Modbus-RTU communication.
(3)The Driver executes the command by receiving the command data from PLC and returns
response data to PLC.
(4)The PLC receives the response data from Driver and stores at the specified address in the
memory.
PLC
RS-485 Driver
CPU Unit
SCU
Ladder program
CIO 5020 to 5023
Command data
setting area
Serial Gateway
function
Command data
Response data
CIO 5500 onwards
Response data
storage area
(2) Sends the command data.
(Modbus-RTU Communication)
(3)Executes the
command and
returns the
response data.
(4)Receives the
response data and
stores it at the
specified address in
the memory.
CMND
(1) Executes the deliver
command instruction.
(CMND instruction)
(The Modbus-RTU
Communication is specified.)

Omron CJ2H-CPU6*-EIP Series Specifications

General

Brand	Omron
Model	CJ2H-CPU6*-EIP Series
Category	Controller
Language	English