Diagnosis and Display

In case of overload or short-circuit, the outputs switch off automatically and try to switch on again cyclically. Therefore an acknowledgement of the outputs is not necessary. The LED error message, however, is stored.

Diagnosis:

E1..E4	d1	d2	d3	d4	Identifier 000..063	AC500 display	<− Display in
Class	Comp	Dev	Mod	Ch	Err	PS501 PLC browser
Byte 6 Bit 6..7	-	Byte 3	Byte 4	Byte 5	Byte 6 Bit 0..5	FBP diagnosis block
Class	Interface	Device	Module	Channel	Error identifier	Error message		Remedy
Module error DC522
3	14	1..10	31	31	19	Checksum error in the I/O module		Replace I/O module
	11 / 12	ADR	1..10
3	14	1..10	31	31	3	Timeout in the I/O module		Replace I/O module
	11 / 12	ADR	1..10
3	14	1..10	31	31	40	Different hard-/firmware versions in the module		Replace I/O module
	11 / 12	ADR	1..10
3	14	1..10	31	31	43	Internal error in the module		Replace I/O module
	11 / 12	ADR	1..10
3	14	1..10	31	31	36	Internal data exchange failure		Replace I/O module
	11 / 12	ADR	1..10
3	14	1..10	31	31	9	Overflow diagnosis buffer		New start
	11 / 12	ADR	1..10
3	14	1..10	31	31	26	Parameter error		Check master
	11 / 12	ADR	1..10
3	14	1..10	31	31	11	Process voltage too low		Check process voltage
	11 / 12	ADR	1..10
4	14	1..10	31	31	45	Process voltage is switched off (ON −> OFF)		Process voltage ON
	11 / 12	ADR	1..10
Channel error DC522
4	14	1..10	2	0..15	47	Short-circuit at an output		Check connection
	11 / 12	ADR	1..10

Remarks:

	In AC500 the following interface identifier applies: 14 = I/O-Bus, 11 = COM1 (e.g. CS31 bus), 12 = COM2. The FBP diagnosis block does not contain this identifier.
	With “Device” the following allocation applies: 31 = Module itself, 1..10 = Expansion module 1..10, ADR = Hardware address (e.g. of the DC551)
	With “Module” the following allocation applies dependent of the master: Module error: I/O-Bus or FBP: 31 = Module itself; COM1/COM2: 1..10 = Expansion 1..10 Channel error: I/O-Bus or FBP = Module type (4 = DC); COM1/COM2: 1..10 = Expansion 1..10
	In case of module errors, with channel “31 = Module itself” is output.

Displays:

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

Status of the LEDs Diagnosis LEDs

LED	Status	Color	LED = OFF	LED = ON	LED flashes
Inputs/outputs 00…15	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 V DC 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	Serious 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