Communications Specifications; Communications Connection Terminal - Omron VARISPEED V7 User Manual

Communications Specifications

Interface
Synchronization
Communication
Parameters
Communication
Protocol
Max. Number of
Inverters That Can Be
Connected

Communications Connection Terminal

Use the following S+, S-, R+ and R- terminals for MEMOBUS commu-
nications. Change the termination resistor as shown below.
At RS-422, RS-485 communications: Turn ON SW2 ON/OFF switch of
Terminal Resistor (1/2 W, 120 Ω)
Note: 1. Separate the wiring for communication from the
main circuit wiring or other power lines.
2. Use shielded cables for communication wiring;
connect the shielded sheath to the ground terminal
and terminate the other end to prevent it from
being connected (to prevent noise malfunction).
3. When communication is performed through RS-
485, connect S+ and R+, S- and R- terminals outside the Inverter as
shown at the right.
142
RS-422, RS-485
Asynchronous (Start-stop synchronization)
Baud rate: Selected from 2400/4800/9600/19200 bps
Data length: 8 bits fixed
Parity: Selected from even/odd/none
Stop bits: 1 bit fixed
MEMOBUS (MODBUS) (RTU mode only)
31 (When using RS-485)
RS-422A
or RS-485
SW1
PNP
NPN
S5 S6 S7 P1 P2
S1 S2 S3 S4 SC PC S+ S- AM AC RP
only the Inverter at the termina-
tion viewed from the PLC.
S+
S-
R+
SW2
R-
SW2 ON/OFF Switch
SW2
OFF
V
R+ R- FS FR FC
ON
I
P2 R+
PC
S+
R-
S-