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Appendix
Appendix. B
The inverter can easily be controlled and monitored using a PROFIBUS-
DP master. The controller sends a 6 word message string to the inverter.
The inverter will respond to each message with a 6 word string. Depending
on the command sent, the inverter will respond with either a AK (word #1)
and inverter status (word #5) or AK (word #1), response to message (word
#4 - i.e. output current) and inverter status (word #5).
To enable PROFIBUS-DP communication with the inverter, no parameter
needs to be set, however, the first 6 word message sent from the controller
must be the command to switch the inverter to NETWORK (NET) mode.
Failure to do so will prevent communication between the inverter and the
network master.
The following examples show how common messages are constructed.
Please be aware that some PROFIBUS-DP masters or Programmable
Logic Controllers (PLC) use high byte / low byte swapping when sending
and receiving messages.
Mitsubishi's A1SJ71PB92D is an example that does implement byte swapping.
Care must be taken when constructing and reading messages. These
examples show constructed messages with and without byte swapping.
Parameter Id
15
Parameter Index
15
Page Index
Parameter Value
15
Parameter Value HIGH
Parameter Value LOW
Process Data
15
Command Count
Reserved
AK:
SPM: Toggle bit for processing the parameter change report.
PNU: Parameter Number
Commonly used PROFIBUS-DP commands
12
11
AK
SPM
(IND)
8 7
Parameter Value
8 7
Status
(HIW)
Task or Response Id
(Not supported, should always be zero.)
(PKE)
Word #1
10
0 Bit No:
PNU
Word #2
0 Bit No:
(PWE)
0 Bit No:
(PWE1) Word #3
(PWE2) Word #4
0 Bit No:
(ZSW1) Word #5
Word #6
38
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