Omron SYSMAC CS Series Operation Manual page 204

CPU Units
Indicator Color
COMM Orange
MCPWR Green
BUSY Orange
166
Status
Flashing CPU Unit is communicating (sending or receiving) via the RS-232C port.
OFF CPU Unit is not communicating via the RS-232C port.
ON Power is being supplied to the Memory Card.
Flashing Flashes once: Easy backup read, write, or verify normal
Flashes five times: Easy backup write malfunction
Flashes three times: Easy backup write warning
Flashes continuously: Easy backup read or verify malfunction
OFF Power is not being supplied to the Memory Card.
Flashing Memory Card is being accessed.
OFF Memory Card is not being accessed.
Meaning
CS1-H CPU Unit
CS
RUN
ERR/ALM
INH BKUP
PRPH COMM
Section 3-1
CS1 CPU Unit
RUN
ERR/ALM
INH
PRPHL/COMM