Schneider Electric 312 manual Output PZDs, Input PZDs, PKW request

PROFIBUS DP mapping

Output PZDs

The first eight bytes contain an aperiodic request (PKW) to write or read a parameter. The remaining 4 bytes contain the output PZDs (written from the PROFIBUS DP master).

1	2	3	4	5	6		7	8	9	10	11		12
			PKW						PZD1			PZD2
PKE		0	R/W			PWE			CMD			LFRD
PKW request
PKE	Parameter logic address
RIW	Request code:

0:No request

1:Read

2:Write

PWE	For a read request: Not used
	For a write request: Parameter value

Cyclic control and adjustment parameters:

PZD1: Communication scanner output word 1 (NC1)

PZD2: Communication scanner output word 2 (NC2)

The default assignment of the periodic output data is:

•PZD1 = Command word

•PZD2 = Speed target

1	2	3	4	5	6	7	8	9	10	11	12
			PKW						PZD1		PZD2
	PKE	0	R/W			PWE		Command word		Speed target

Input PZDs

The first eight bytes contain the response (PKW) to the aperiodic read/write request.

The remaining 4 bytes contain the input PZDs (read mode).

1	2	3	4	5	6		7	8	9	10	11		12
			PKW						PZD1			PZD2
PKE		0	R/W/N			PWE			ETA			RFRD
PKW request
PKE	Parameter logic address
R/W/N	Response code:

0:No request

1:Successful read report

2:Successful write report

7:Error report

PWE	For a successful request: Parameter value
	For an incorrect request:

0:Incorrect address

1:Write access denied

Cyclic monitoring parameters:

PZD1: Communication scanner input word 1 (ETA)

PZD2: Communication scanner input word 2 (RFRD)

The default assignment of the periodic input data is:

•PZD1 = Status word (ETA)

•PZD2 = Output speed (RFRD)

1	2	3	4	5	6	7	8	9	10	11	12
			PKW						PZD1		PZD2
	PKE	0	R/W			PWE		Status word		Output speed

S1A10386 10/2009 21