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	PNIO diagnosis block
Class	Interface	Device	Module	Channel	Error Identifier	Error message		Remedy
	1)	2)	3)	4)
Module error
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	9	Overflow diagnosis buffer		Restart
	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
Channel error
4	14	1..10	3	0…1	48	Analog value overflow at an analog output		Check output value or terminal
	11 / 12	ADR	1..10
4	14	1..10	3	0…1	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 PNIO diagnosis block does not contain this identifier.
2)	With “Device” the following allocation applies: 31 = module itself, 1..10 = expansion module 1..10, ADR = hardware address (e. g. of the DC551-CS31)
3)	With “Module” the following allocation applies depending on the master: Module error: I/O bus or PNIO: 31 = module itself; COM1/COM2: 1..10 = expansion 1..10 Channel error: I/O bus or PNIO = module type (3 = AO); COM1/COM2: 1..10 = expansion 1..10
4)	In case of module errors, with channel “31 = Module itself” is output.