
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 –
PKW | PZD |
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PKE | IND | PWE | PZD1 | PZD2 |
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| STW | HSW | PCD3 | PCD4 | PCD5 | PCD6 | PCD7 | PCD8 | PCD9 | PCD10 |
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| ZSW | HIW |
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PKW: Parameter ID/value.
PKE: Parameter ID.
IND:
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
SPM: Toggle bit for Spontaneous Messages, not used by
PNU: Parameter number. Range 1- 418 for Hitachi specific parameters and
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