Omron CJ1W-SCU32 Operation Manual page 15

Section 7 Using 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
Section 8 Loopback Test
8-1 Executing Loopback Tests ..................................................................................................... 8-2
8-1-1 Overview..................................................................................................................................... 8-2
8-1-2 Connection Method..................................................................................................................... 8-2
8-1-3 Procedure ................................................................................................................................... 8-2
8-1-4 Indicators Used for the Loopback Test........................................................................................ 8-3
8-2 Device Variable for CJ-series Unit (Loopback Test) ............................................................. 8-4
8-2-1 Device Variables for CJ-Series Unit for System Settings............................................................ 8-4
8-2-2 Device Variables for CJ-Series Unit for Status ........................................................................... 8-5
Section 9 Troubleshooting and Maintenance
9-1 Indicator Error Displays .......................................................................................................... 9-2
9-2 Communications Status Error Notification ........................................................................... 9-3
9-2-1 Status Area Error Information ..................................................................................................... 9-3
9-3 Troubleshooting....................................................................................................................... 9-4
9-3-1 Serial Gateway (Serial Gateway or Protocol Macro Mode)......................................................... 9-4
9-3-2 No-protocol Mode ..................................................................................................................... 9-10
9-3-3 Protocol Macros........................................................................................................................ 9-16
9-3-4 Modbus-RTU Slave Mode......................................................................................................... 9-22
9-4 Error Logs .............................................................................................................................. 9-25
9-4-1 Error Log Data .......................................................................................................................... 9-25
9-4-2 Error Contents and Details ....................................................................................................... 9-26
9-4-3 Error Codes and Troubleshooting ............................................................................................. 9-28
9-5 Event Logs ............................................................................................................................. 9-30
9-5-1 Overview of the Event Logs...................................................................................................... 9-30
9-5-2 Error Table ................................................................................................................................ 9-30
9-5-3 Error Descriptions..................................................................................................................... 9-36
9-6 Cleaning and Inspection ....................................................................................................... 9-53
9-6-1 Cleaning.................................................................................................................................... 9-53
9-6-2 Inspection ................................................................................................................................. 9-53
9-7 Replacement Precautions..................................................................................................... 9-55
9-7-1 Precautions when Replacing Unit............................................................................................. 9-55
9-7-2 Settings after Replacing Unit .................................................................................................... 9-55
9-7-3 Replacing the Unit .................................................................................................................... 9-56
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
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