Omron CP1H CPU Operation Manual page 377

Serial Communications
Communications are easily achieved by simply by
turning ON a software switch after setting the
Modbus-RTU command in the DM fixed allocation
words.
Modbus-RTU Master
Execution Bit for Port 1
A640.00
Modbus-RTU
DM Fixed Allocation
Words for the
Modbus-RTU Easy
Master
Modbus-RTU commands can be set simply by turning ON a software switch
after setting the Modbus slave address, function, and data in the DM fixed
allocation words for the Modbus-RTU Easy Master. The response when
received is also store in the DM fixed allocation words for the Modbus-RTU
Easy Master.
D32200
D32201
D32202
D32203
:
:
Modbus-RTU commands are stored in the DM Area in D32200 to D32249 for
serial port 1 and in D32300 to D32349 for serial port 2. When a response is
received after turning ON the Modbus-RTU Master Execution Bit, it is stored
in D32250 to D32299 for serial port 1 and in D32350 to D32399 for serial port
2.
Words
Serial Serial
port 1 port 2
D32200 D32300 00 to 07
08 to 15
D32201 D32301 00 to 07
08 to 15
D32202 D32302 00 to 15
D32203 to D32303 to 00 to 15
D32249 D32349
D32250 D32350 00 to 07
08 to 15
D32251 D32351 00 to 07
08 to 15
D32252 D32352 00 to 07
08 to 15
D32253 D32353 00 to 15
D32254 to D32354 to 00 to 15
D32299 D32399
15
08 07
Slave address
Function code
Number of communications data bytes
Communications data
Slave address Function code
Slave address Function code
Modbus-RTU
Bits
Command Slave address (00 to F7 hex)
Reserved (Always 00.)
Function code
Reserved (Always 00.)
Number of communications data
bytes (0000 to 005E hex)
Communications data
(94 bytes maximum)
Response Slave address (00 to F7 hex)
Reserved (Always 00.)
Function code
Reserved
Error code
Reserved (Always 00.)
Number of response bytes (0000
to 03EA hex)
Response data
(92 bytes maximum)
Section 6-1
00
Communications data
Communications data
OMRON Inverters
3G3JV, 3G3MV, or 3G3RV
Contents
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