State LEDs

During the power ON procedure, the module initializes automatically. All LEDs (except the channel LEDs) are ON during this time.

LED	State	Color	LED = OFF	LED = ON	LED flashes
Inputs/outputs 00…23	Digital input or digital output	Yellow	Input/output = OFF	Input/output = ON (the input voltage is even displayed if the supply voltage is OFF).	–
UP	Process supply voltage 24 VDC via terminal	Green	Process supply voltage is missing	Process supply voltage OK	–
CH-ERR1	Channel error, error messages in groups (digital inputs/outputs combined into the groups 1, 2, 3, 4)	Red	No error or process supply voltage is missing	Severe error within the corresponding group	Error on one channel of the corresponding group (e.g. short-circuit at an output)
CH-ERR2		Red
CH-ERR3		Red
CH-ERR4		Red
CH-ERR *)	Module error	Red	–	Internal error	–
*) All of the LEDs CH-ERR1 to CH-ERR4 light up together