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MELSEC-Q
6 PROGRAMMING
(14) Checking the communication status between the network module
and the CPU module
The communication status between the network module and the CPU module
can be checked with the link special relay (SB) and the link special register (SW).
(a) Checking the error details
1) When an error occurs in the communication between the network
module and the CPU module, Module status (SB0020) turns ON.
2) An error code is stored in Module status (SW0020).
No. Description No. Description
SB0020 Module status SW0020 Module status
(b) Checking the external power supply status
Whether external power is supplied to the host station or not can be
checked with Power supply status of host (SB0042).
External power supply to other stations can be checked with Power supply
status of each station (SW008C to SW008F).
No. Description No. Description
SB0042 Power supply status of host
SW008C to
SW008F
Power supply status of each station