Hitachi SJ-PB(T) Instruction Manual page 15

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
PKE IND PWE
PKW: Parameter ID/value.
PKE: Parameter ID.
rd
IND: Sub-index (3 byte, 4
PWE: Parameter value (4 bytes).
PKE handling:
b b b b b
15 14 13 12 11
AK SPM
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.
PZD
PZD1 PZD2
STW HSW
ZSW HIW
th
byte is reserved).
b b b b b
10 9 8 7
Figure 5-1 PCA word
PCD3 PCD4 PCD5
b b b b
6 5 4 3 2
PNU
11
CHAPTER5 OPERATING
PCD6 PCD7 PCD8
b b
1 0
PCD9 PCD10