Diagnosis

In cases of short circuit or overload, the digital outputs are turned off. The module performs reactivation automatically. Thus an acknowledgement of the errors is not necessary. The error message is stored via the LED.

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
	1)	2)	3)	4)
Module error
0 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
	11 / 12	ADR	1..10
3	14	1..10	31	31	40	Different hard-/firmware versions in the module
	11 / 12	ADR	1..10
3	14	1..10	31	31	43	Internal error in the module
	11 / 12	ADR	1..10
3	14	1..10	31	31	36	Internal data exchange failure
	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 DA501
4	14	1..10	2	22..29:sup:5)	47	Short circuit at a digital output		Check connection
	11 / 12	ADR	1..10
Channel error DA501
4	14	1…10	1	16..19:sup:6)	48	Analog value overflow or broken wire at an analog input		Check input value or terminal
	11 / 12	ADR	1..10
4	14	1…10	1	16..19:sup:6)	7	Analog value underflow at an analog input		Check input value
	11 / 12	ADR	1..10
4	14	1…10	1	16..19:sup:6)	47	Short circuit at an analog input		Check terminal
	11 / 12	ADR	1..10
4	14	1…10	3	20..21:sup:7)	4	Analog value overflow at an analog output		Check output value
	11 / 12	ADR	1..10
4	14	1…10	3	20..21:sup:7)	7	Analog value underflow at an analog output		Check output value
	11 / 12	ADR	1..10

Remarks:

1)	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.
2)	With “Device” the following allocation applies: 31 = module itself, 1..10 = decentralized communication interface module 1..10, ADR = hardware address (e.g. of the DC551)
3)	With “Module” the following allocation applies depending on 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 (1 = AI, 3 = AO, 4 = DC); COM1/COM2: 1..10 = expansion 1..10
4)	In case of module errors, with channel “31 = Module itself” is output.
5)	Ch = 22..29 indicates the digital inputs/outputs DC16..DC23
6)	Ch = 16..19 indicates the analog inputs AI0..AI3
7)	Ch = 20..21 indicates the analog outputs AO0..AO1