Mitsubishi 700 Series - Page 134

PROTOCOL-SPECIFIC INFORMATION
121
9
NetCtrl: Run/stop control source selection (0=local control, 1=network control). Maps to inverter register
4 (operation mode).
NetRef: Speed reference source selection (0=local control, 1=network control). Maps to inverter register
4 (operation mode).
NetCtrl and NetRef explanation: Although the intent of
these bits is to be able to independently separate the
inverter’s run/stop command source and speed
reference source, the inverter only has one externally-
accessible “operation mode” command register, which
controls both the run/stop source and speed reference
source simultaneously. Therefore,
Table 31 can be
used to determine the resultant value of the “operation
mode” register based on the various combinations of
NetCtrl and NetRef.
Speed Reference: Inverter speed reference in RPM. Maps to inverter register 14 (frequency command).
The frequency command value written to the inverter depends on the settings of parameters Pr. 37 and
Pr. 144 (refer to
Table 32). The speed reference component of the AC/DC drive profile output instances
is always in units of RPM. With certain combinations of Pr. 37 and Pr. 144, however, the inverter
interprets its incoming frequency command either as an actual frequency command (with units of Hz) or
as a speed reference (with units of RPM). Therefore, the interface card will apply an RPM-to-Hz
conversion equation when necessary, or will pass the consumed speed reference value directly on to
the inverter as-is when the inverter is already expecting the frequency command to be in units of RPM.
Table 31: NetCtrl/NetRef Behavior
NetCtrl NetRef
“Operation Mode”
Register Value
0
0
0x0010 (EXT mode)
0
1
No change from
current value
1
0
1
1
0x0014 (NET mode)