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
Module error DO571
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	43	Internal error in the 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
4	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

Remarks:

	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.
	With “Device” the following allocation applies: 31 = Module itself, 1..10 = Expansion module 1..10, ADR = Hardware address (e. g. of the DC551-CS31)
	With “Module” the following allocation applies dependent of 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 (2 = DO); COM1/COM2: 1..10 = expansion 1..10
	In case of module errors, with channel “31 = Module itself” is output.