Hitachi SJ-PB(T) instruction manual PKW-part, PCA word

CHAPTER5 OPERATING

5.2 PKW-part

The parameter part (PKW) is fixed to 4 words and can be used for reading and/or updating the parameters in the inverter one by one. Requests and responses is a handshake procedure and cannot be batched, meaning that if the master sends out a read/write request, it has to wait for the response, before it sends a new request.

The PKW is further divided into three parts; PKE- Parameter ID (2 bytes), IND – Sub-index (2 bytes) and PWE- Parameter value (4 bytes).

PKW

PZD

PKE

IND

PWE

PZD1

PZD2

STW

HSW

PCD3

PCD4

PCD5

PCD6

PCD7

PCD8

PCD9

PCD10

ZSW

HIW

PKW: Parameter ID/value.

PKE: Parameter ID.

IND: Sub-index (3rd byte, 4th byte is reserved).

PWE: Parameter value (4 bytes).

PKE handling:

b15 b14 b13 b12 b11 b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0

AK

SPM

PNU

Figure 5-1 PCA word

AK: Request/response characteristics (Range 0-15)

SPM: Toggle bit for Spontaneous Messages, not used by SJ-PB(T).

PNU: Parameter number. Range 1- 418 for Hitachi specific parameters and 900-999 for Profidrive specific parameters. Please refer to chapter 3.5 for which Profidrive specific parameters that are supported.

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