Johnson Controls Penn VFD68D Series Technical Bulletin page 91

Using the Modbus RTU communication protocol, you can set the communication operation or parameter using
the operation panel on the VFD68 drive. These parameters can be set when P.160 = 0.
Table 86: Parameters for ModBus RTU RS485 Communications
Parameter Name
Number
P.117 PU
communication
station number
P.118 PU
communication
speed
P.120 PU
communication
parity check
2 PU
P.122
communication
check time
interval
P.343 Communication
error count
P.502 Stop mode
selection at
communication
error
P.549 Protocol
selection
1. When Modbus RTU communication is performed from the master with address 0 (station number 0) set, broadcast
communication is selected and the VFD does not send a response message. When a response from the VFD is
necessary, set a value other than 0 in P.117. Some functions are invalid for broadcast communication.
2. Specifications differ according to the date assembled.
Default Range
0 0
No reply to the master
1 to 247 VFD station number specification
Set the VFD station numbers when two or more VFDs are
connected to one computer.
96 48, 96, Communication speed
192, 384
The setting value x 100 equals the communication speed.
For example, if the communication setting is 96, the
communication speed is 9600 bps.
2 0 Without parity check; Stop bit length: 2 bits
1 With odd parity check; Stop bit length: 1 bit
2 With even parity check; Stop bit length: 1 bit
9999 0
0.1 to
999.8
9999
0 ___ Displays the number of communication errors during
Modbus RTU communication (reading only)
0 At Fault
Occurrence
0 Coasts to stop
1 Decelerates to
stop
2 Decelerates to
stop
0 0 VFD (computer link operation) protocol
1 Modbus RTU protocol
VFD68 Variable Frequency Drives
91
1
Indication Fault
Output
E.PUE Output
After stop, Output after
E.PUE stop
After stop, Without
E.PUE output
At Fault
Removal
Stop
(E.PUE)
Stop
(E.PUE)
Automatic
restart
functions