Mitsubishi Electric MELSEC iQ-R C R12CCPU-V User Manual page 214

System information
The special relays for system information are as follows.
No. Name
*1
SM220 CPU No.1 preparation
completed
*1
SM221 CPU No.2 preparation
completed
*1
SM222 CPU No.3 preparation
completed
*1
SM223 CPU No.4 preparation
completed
*1 These devices are used as an interlock to access the CPU No.1 when the multiple CPU synchronization setting is configured with
asynchronous mode.
Firmware update function
The special relays for the firmware update function are as follows.
No. Name
SM922 Firmware update
completion with/without an
error
CC-Link IE Field Network Basic function
The special relays related to the CC-Link IE Field Network Basic function are as follows.
No. Name
SM1536 Cyclic transmission status
SM1540 Data link status
APPX
212
Appendix 5 Special Relay List
Content Details
OFF: CPU No.1 This device turns ON when the access from another CPU
preparation not module to the CPU No.1 is enabled after turning the
completed power ON or resetting the module.
ON: CPU No.1
preparation completed
OFF: CPU No.2 This device turns ON when the access from another CPU
preparation not module to the CPU No.2 is enabled after turning the
completed power ON or resetting the module.
ON: CPU No.2
preparation completed
OFF: CPU No.3 This device turns ON when the access from another CPU
preparation not module to the CPU No.3 is enabled after turning the
completed power ON or resetting the module.
ON: CPU No.3
preparation completed
OFF: CPU No.4 This device turns ON when the access from another CPU
preparation not module to the CPU No.4 is enabled after turning the
completed power ON or resetting the module.
ON: CPU No.4
preparation completed
Content Details
OFF: Update completed This device turns ON when the firmware update function
without an error (including is completed with an error. (SM922 turns ON when 'Latest
successful completion) firmware update result' (SD922) is in the range from
ON: Update completed '100H' to '300H'.)
with an error
Content Details
OFF: Transmission not This device turns ON when cyclic transmission is started,
executed and turns OFF when the cyclic transmission is stopped.
ON: Transmitting
OFF: No error station This device turns ON when an error occurs in one or more
ON: Error station found slave stations.
The status of each slave station can be checked with
'Data link status of each station' (SD1540).
Set by (when to set)
S (status change)
S (status change)
S (status change)
S (status change)
Set by (when to set)
S (initial)
Set by (when to set)
S (END processing)
S (END processing)