State LEDs

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

States of the LEDs (see also section Diagnosis LEDs in the S500 system data):

LED	State	Color	LED = OFF	LED = ON	LED flashes
Inputs 00 … 03 and 04 … 07	Analog input	Yellow	Input is OFF	Input is ON (brightness depends on the value of the analog signal)	–
UP	Process voltage 24 VDC via terminal	Green	Process voltage is missing	Process voltage OK	–
CH-ERR2	Channel error, messages in groups (analog inputs combined into the groups 2 and 4)	Red	No error, or process voltage is missing	Serious error within the corresponding group	Error on one channel of the group
CH-ERR4		Red
CH-ERR *)	Module error	Red	–	Internal error	–
*) Both LEDs CH-ERR2 and CH-ERR4 light up together