Omron CJ1W-SCU32 Operation Manual page 251

Using Modbus-RTU Slave Mode
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
This section describes the procedure and other information required to use Modbus-
RTU Slave Mode.
7-1 Modbus-RTU Slave System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2
7-1-1 Modbus-RTU Slave System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2
7-1-2 Modbus-RTU Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2
7-1-3 Communicating with NJ-series CPU Units Using Modbus . . . . . . . . . . . . . . . 7-3
7-2 Device Variables for CJ-series Unit and System-defined Variables
(Modbus-RTU Slave Mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-5
7-2-1 Device Variable for CJ-series Unit for System Settings . . . . . . . . . . . . . . . . . . 7-5
7-2-2 System-defined Variable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-8
7-2-3 Device Variable for CJ-series Unit for Software Switches . . . . . . . . . . . . . . . . 7-8
7-2-4 Device Variable for CJ-series Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-9
7-3 Command and Response Details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-13
7-3-1 Supported Modbus-RTU Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-13
7-3-2 Command and Response Details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-14
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7-1