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7.6.6 Monitoring
When using a PC(PLC) link, the operation status of the links can be monitored using the following relays.
Transmission assurance relays
For PC(PLC) link 0: R9060 to R906F (correspond to unit no. 1 to 16)
For PC(PLC) link 1: R9080 to R908F (correspond to unit no. 1 to 16)
If the transmission data from a different unit is being used with the various PLCs, check to make sure the
transmission assurance relay for the target unit is on before using the data.
Exclusive internal relays "link relays (L)" and data registers "link registers (LD)" are shared between the
connected PLCs.
Operation mode relays
For PC(PLC) link 0: R9070 to R907F (correspond to unit no. 1 to 16)
For PC(PLC) link 1: R9090 to R909F (correspond to unit no. 1 to 16)
The operation modes (RUN/PROG.) can be checked for any given PLC.
PLC link transmission error relay R9050
This relay goes on if a problem is detected during transmission.
Key Point: Monitoring the PC(PLC) link status
Using a programming tool, the PC(PLC) link status items, such as the transmission cycle time and the
number of times that errors have occurred, can be monitored.
Using FPWIN GR: Select [Status Display] under [Online] in the menu. Click the [PC link] button after the
[Status Display] screen is shown.
Using FPWIN Pro: Select [PLC Link Status] under [Online] in the menu.
Note: Remote programming of the linked PLCs is not possible from the programming tool.
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