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IO Server redundancy behaviour and syslog related query

Rohan

With my redundant IO Server,

I monitored back to back trace entry for my modbus device's PORT in Standby SCADA's IOserver syslog,

2020-07-08 19:20:50:2050 +05:30 [TRACE] [CORE       ] [0x2b18] [IOServer        ] [(GLOBAL)        ] [InitChannel()                                     ] [plc_drv.cpp                   ] [1272] Channel nPort_009_S is Online
2020-07-08 19:21:20:2120 +05:30 [TRACE] [CORE       ] [0x2b18] [IOServer        ] [(GLOBAL)        ] [InitChannel()                                     ] [plc_drv.cpp                   ] [1272] Channel nPort_009_S is Online
2020-07-08 19:20:20:2020 +05:30 [TRACE] [CORE       ] [0x2b18] [IOServer        ] [(GLOBAL)        ] [InitChannel()                                     ] [plc_drv.cpp                   ] [1272] Channel nPort_009_S is Online
2020-07-08 19:20:50:2050 +05:30 [TRACE] [CORE       ] [0x2b18] [IOServer        ] [(GLOBAL)        ] [InitChannel()                                     ] [plc_drv.cpp                   ] [1272] Channel nPort_009_S is Online
2020-07-08 19:21:20:2120 +05:30 [TRACE] [CORE       ] [0x2b18] [IOServer        ] [(GLOBAL)        ] [InitChannel()                                     ] [plc_drv.cpp                   ] [1272] Channel nPort_009_S is Online

In this case my devices's communication is healthy all the time and no single entry found in Primary SCADA's IOserver syslog.

Can someone explain this behavior?

Primary SCADA Kernel,

Standby SCADA Kernel,

If this IODevice is connected to Primary SCADA Server then why error count in Driver windows increasing?

Why Unit status is offline in Standby instead of Standby?

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  • The unit statistics from the screencaptures are from a different portname (nPort_012_s. Make sure you pack the dbfs. Use one I/O device per port. This is modbus (not modnet) which is serial communication, do you have two modbus cards in your controller? Did you use modscan or something to check the modbus communication?
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  • The unit statistics from the screencaptures are from a different portname (nPort_012_s. Make sure you pack the dbfs. Use one I/O device per port. This is modbus (not modnet) which is serial communication, do you have two modbus cards in your controller? Did you use modscan or something to check the modbus communication?
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