Omron CP1H-CPU - 05-2006, Operation Manual

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