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Profibus PROFILES—PPO Support Specification
6.4.1 Points to note
Only when the contents of the command request (request for changing the inverter setting: PKW, HSW,
STW/ECW) from the master changed, the inverter processes the request. If the contents of the command
request are identical with those of the last request, the inverter does not process the request. (The
received request is cleared.)
PZD
ESW
SU
signal
0
0: OFF
1: ON (Up to frequency)
OL
signal
1
0: OFF
1: ON (Overload alarm)
-
2 to 7
Not used (0 is set)
Command
count
8 to 15 Echo back of the command request.
Reserved
0 to 15 Not used (0 is set, 0 is returned)
For instance, while the master keeps sending the "network operation mode enabled" command, chang-
ing the mode to the PU operation mode with switchover function does not allow the "network operation
mode enabled" command to be executed due to the same contents as that sent last time. Therefore, the
operation mode remains the PU operation mode without changing to the network operation mode.
In this case, send another command as "PU operation mode enabled" from the master once, then send
the "network operation mode enabled" command again.
Name
Bit
Description