PNIO Status (Error Code)

The PNIOStatus is an 8-place hexadecimal code which is not part of the PROFINET diagnosis in the actual sense. The PNIOStatus is an error/abort code of failed services and is issued for example in the case of log errors or failed connection attempts. The user usually comes in contact with it only in the case of an acyclic read/write service (RDREC / WRREC) or establishing a connection with a device.

The value is interpreted as a 4-byte array with the following elements:
`ErrorCode`	0x40	CODESYS	CODESYS-specific errors, see: `CommFB.ErrorCode`
	0x81	PNIO	Errors which are not otherwise described here
	0xCF	RTA error	Error, connection termination
	0xDA	AlarmAck	Error in alarm handling
	0xDB	IODConnectRes	(RPC-PDU)
	0xDC	IODReleaseRes	(RPC-PDU)
	0xDD	IODControlRes	IOXControlRes (RPC-PDU)
	0xDE	IODReadRes	Errors in acyclic reading (RPC, only with ErrorDecode=PNIORW)
	0xDF	IODWriteRes	Errors in acyclic writing (RPC, only with ErrorDecode=PNIORW)
`ErrorDecode`	0x80	PNIORW	Used in the context of errors in acyclic reading. Equivalent to IEC 61158-6-3 (DPV1).
	0x81	PNIO	In the context of remaining services or for internal errors such as RPC errors.
`ErrorCode1`			Value of `ErrorCode1` (see table)
`ErrorCode2`			Value of `ErrorCode2` (see table)

Table 1. ErrorCode1

For `ErrorDecode` = PNIORW, see `CommFB.ErrorCode_RW`.
For `ErrorDecode` = PNIO
0x01–0x0D	Connect parameter error
0x14–0x38	Other PDU related errors
0x3D	Device protocol machine
0x3E	Controller protocol machine
0x3F	Controller protocol machine for discovery, IP, and name assignment
0x40–0xD3	Other state machine errors
0xFD	Protocol errors: Abort reason See table `ErrorCode2`

Table 2. ErrorCode2

For `ErrorDecode` = PNIO and `ErrorCode1` = 0xFD
`0x05`	AR consumer DHT expired
`0x06`	AR CMI timeout
`0x0B`	AR alarm.ind (err)
`0x0D`	AR abort.req
`0x20`	DCP, reset to factory or factory reset
`0x28`	Remote application ready timeout expired

Tip

The lists of ErrorCode1 and ErrorCode2 are incomplete and show only the most important error codes.

Table 3. Examples

0x81813F02	DCP no RealStationname The device with the specified station name was not found.
0x81813F03	DCP multiple RealStationName Multiple devices with the same station name were found.
0x81813F06	DCP set error The DCP set command has failed (for example, IP address or station name).
0x81813F07	ARP multiple IP addresses The IP address is assigned multiple times: network error.
0xCF81FD05	AR consumer DHT expired The send clock could not be maintained: connection termination.