Omron CJ2M-CPU Series - Page 44

9
．
Program
41
9.1.2. CMND Instructions and Send/Receive Messages
The following overviews the basic operations to execute the network communications
instruction (instruction word: CMND, hereinafter referred to as CMND instruction) and to
send/receive messages.
Additional Information
For details on the CMND instruction, refer to Network Instructions in SECTION 3 Instructions
of the CJ Series Programmable Controllers INSTRUCTIONS REFERENCE MANUAL (Cat.
No. W474).
●CMND instruction operand data
S: First command word
・The first address is specified to set a send command.
・Data is sent from the first command word in the following format.
*Command code #2804 is a FINS command for Modbus-RTU communication.
D: First response word
・The first address is specified to store a response.
・Data is received at the first response word in the following format.
Additional Information
For the address and the function code in the first command word, a device number defined by
Destination Device and a command code for an executable function are set.
For details, refer to the manuals for Destination Device.
28
Command
04
Command
code
Address
Function
code
Data
+0CH
+1CH
**
**
**
**
**
Response
Command
code
Address
Function
code
End code
Data
28
04
+0CH
+1CH
+2CH
**
**
**
**
**
**
**