Omron GQ-CRM21 Operation Manual page 24

Easy Maintenance with Complete System Monitoring Functions
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The CompoNet Network is constantly monitored to enable confirming system safety by quickly iden-
tifying errors and checking communications status.
• Gateway Unit Detection of Network Participation, Errors, and Status
When a CompoNet Slave Unit joins the network, a Participation Flag that corresponds to the node
address of the Unit turns ON. If a CompoNet Slave Unit that was participating in the network is
disconnected from the network, a Communications Error Flag that corresponds to the node
address of the Unit turns ON.
Network status, such as communications errors and duplicated Slave Unit node addresses, and
Slave Unit diagnostic results are detected by the Gateway Unit and displayed on the seven-seg-
ment display on the front panel and reflected in the Status Flags. (Communications mode 0 to 3
must be set.)
• Registration Table
A table of the Slave Units that should be participating at the nodes (including the node addresses
and corresponding Slave Unit model numbers) can be registered to verify the Slave Units actually
participating in the network and prevent unregistered Slave Units from participating in the net-
work.
• Communications Status on Gateway Unit Seven-segment Display
The seven-segment display on the front of the Gateway Unit can be used to check communica-
tions status. The number of connected nodes is normally displayed, but if an error occurs, the
error code is displayed in hexadecimal and the error node address is displayed in decimal.
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CompoNet Gateway Unit for CC-Link Operation Manual