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12.6 Special Relay List
12
TROUBLESHOOTING
(2) System information
Table12.13 Special relay
Number Name Meaning Explanation
Set by
(When Set)
Corresponding
CPU
SM203 STOP contact STOP status • Turns ON when the CPU is in STOP status. S (Status change)
QS
SM210
Clock data set
request
OFF: Ignored
ON: Set request
• Writes clock data stored in SD210 to SD213
to the CPU module after the END instruction
of the scan where the relay changes OFF to
ON has been executed.
U
SM211 Clock data error
OFF: No error
ON: Error
• Turns ON when an error is detected in the
clock data (SD210 to SD213) and turns OFF
if no error is detected.
S (Request)
SM213
Clock data read
request
OFF : Ignored
ON : Read request
• Reads clock data to SD210 to SD213 in BCD
value when the relay is ON.
U
SM232
Number of
writes to ROM
OFF : Within the number
of writes
ON : Over the number of
writes
• Turns ON when the number of writes to ROM
exceeds 100,000.
S (Error)