Displays

Statuses of the LEDs:

LED	Status	Color	LED = OFF	LED = ON	LED Flashes
PWR	System voltage	green	System firmware is not running	System firmware is running	–
CS31 A	CS31 communication	green	No communication at CS31 Bus A	Communication at CS31 Bus A OK	10 Hz: Not bit lifetime management
C. B	CS31 communication	green	No communication at CS31 Bus B	Communication at CS31 Bus B OK	10 Hz: Not bit lifetime management
S-ERR	Sum Error	red	–	Internal error detected	2 Hz: Diagnostic event happened
I/O-Bus	Communication via the I/O Bus	green	No I/O Bus communication	Expansion modules connected	2 Hz: Error I/O-Bus
RUN A	CPU active	green	CPU A is not primary	CPU A is primary	RUN B LED off: CI590-CS31-HA primary self selection. No primary order from both PLC. PLC A has been selected as primary. RUN B LED on: 2 primary orders. PLC B is primary.
R. B	CPU active	green	CPU B is not primary	CPU B is primary	RUN A LED off: CI590-CS31-HA primary self selection. No primary order from both PLC. PLC B has been selected as primary. RUN A LED on: 2 primary orders. PLC A is primary.
SYNC-ERR	Outputs from CPU A and CPU B	red	–	Configuration conflict detected	10 Hz: Not parameterized 2 Hz: Switch-over has occured
C0 … C15	Digital inputs/outputs	yellow	Input/output = OFF	Input/output = ON (the input voltage is even displayed if the supply voltage is OFF)	–
UP	Process supply voltage and initialization	green	Process voltage is missing	Process voltage OK and initialization completed	Module was not initialized correctly
CH-ERR3		red	No error	Serious error within the corresponding group	Error on one channel of the corresponding group (e.g. short-circuit at an output)
CH-ERR4		red	No error	Serious error within the corresponding group	Error on one channel of the corresponding group (e.g. short-circuit at an output)
CH-ERR *)	Module error	red	No error or process voltage is missing	Internal error	–
*) All LEDs CH-ERR2 to CH-ERR4 light up together