Omron SYSDRIVE 3G3RV, User Manual

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Communications Functions
6-
77
* Set
H5-01 to 0 to disable Inverter responses to RS-422A/485 communications.
RS-422A/485
communications can perform the following operations regardless of the settings in b1-01 and
b1-02.
• Monitoring
operation status from the PLC
•
Setting
and reading parameters
• Resetting
errors
•
Inputting
multi-function commands
An
OR operation is performed between the multi-function commands input from the PLC and commands
input
from multi-function contact input terminals S3 to S7.
n
RS-422A/485 Communications Configuration
RS-422A/485
communications are configured using 1 master (PLC) and a maximum of 32 slaves. Serial com-
munications
between master and slave are normally started by the master, and the slave responds.
The
master performs signal communications with one slave at a time. Consequently, you must set the address
of
each slave beforehand, so the master can perform signal communications using that address. Slaves receiv-
ing
commands from the master perform the specified function, and send a response to the master.
Fig 6.54 Example of Connections between PLC and Inverter
U1-39
RS-422A/485
communica-
tions
error
Bit
0: CRC error
Bit
1: Data length error
Bit
2: Not used.
Bit
3: Parity error
Bit
4: Overrun error
Bit
5: Framing error
Bit
6: Timeout
Bit
7: Not used.
Refer
to the parameter tables for Digital Operator
displays.
0
to FF
- - A A A
Transmit
Err
Param-
eter
Num-
ber
Name
Description
Setting
Range
Factory
Setting
Change
during
Opera-
tion
Control Methods
V/f
V/f
with
PG
Open
Loop
Vec-
tor
LCD Display
SYSMAC-series PLC
RS-485 connections
example
Inverter Inverter Inverter