State LEDs

The LEDs are located at the front of the module. There are 2 different groups:

• The 5 system LEDs (PWR, CN-RUN, CN-ERR, S-ERR and I/O bus) show the operation states of the module and display possible errors.
• The 29 process LEDs (UP, UP3, inputs, outputs, CH-ERR1 to CH-ERR3) show the process supply voltage and the states of the inputs and outputs and display possible errors.

States of the 5 System LEDs

LED	Color	OFF	ON	Flashing
PWR/RUN	Green	Process supply voltage missing	Internal supply voltage OK, module ready for communication with I/O controller	Start-up / preparing communication
	Yellow	—	—	—
CN-RUN	Green	—	Device configured, CANOPEN bus in OPERATIONAL state and cyclic data exchange running	Flashing: CANOPEN bus in PRE-OPERATIONAL state and slave is being configured Single flash: CANOPEN bus in STOPPED state. Flickering: Auto-detect is active
CN-ERR	Red	No system error	CANOPEN Bus is OFF	Flashing: Configuration error Single flash: error counter overflow due to too many error frames Double flash: A node-guard or a heartbeat event occurred Flickering: Auto-detect is active
S-ERR	Red	No error	Internal error	–
I/O bus	Green	No decentralized communication interface modules connected or communication error	Decentralized communication interface modules connected and operational	—

States of the 29 Process LEDs

LED	Color	OFF	ON	Flashing
DC0 to DC7	Yellow	Input/output is OFF	Input/output is ON	–
DI8 to DI15	Yellow	Input is OFF	Input is ON (the input voltage is even displayed if the supply voltage is OFF)	–
DO8 to DO15	Yellow	Output is OFF	Output is ON	–
UP	Green	Process supply voltage missing	Process supply voltage OK and initialization finished	–
UP3	Green	Process supply voltage missing	Process supply voltage OK	–
CH-ERR1 to CH-ERR3	Red	No error or process supply voltage missing	Internal error	Error on one channel of the corresponding group