Omron SYSDRIVE 3G3RV Series User Manual page 293

Name
Param-
eter
Num-
LCD Display
ber
RS-422A/485 communica-
tions error
U1-39
Transmit Err
* 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.
nRS-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.
RS-485
example
Fig 6.54 Example of Connections between PLC and Inverter
Description
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.
SYSMAC-series PLC
Inverter
connections
Communications Functions
Change
Setting Factory during
Range Setting Opera-
tion
0 to FF - -
Inverter Inverter
Control Methods
Open
V/f
Loop
V/f with
Vec-
PG
tor
A A A
77
6-