Omron CJ Series - Sending Acyclic Messages Using SendCmd Instructions

6-3
6 Message Communications
CJ-series PROFIBUS Master Unit Operation Manual for NJ-series CPU Unit (W509)
6-2 Sending Acyclic Messages Using SendCmd Instructions
6
6-2 Sending Acyclic Messages Using
SendCmd Instructions
The SendCmd (send command) instruction can be used in the CPU Unit user program of the CJ-series
PROFIBUS Unit to send acyclic messages.
In a program that issues acyclic messages, the following execution conditions are generally used
based on the AND gate:
• Network Enabled Flag on the CPU Unit side
• *_MstrOperateSta; the PROFIBUS Master Unit is in Operate mode and commencing I/O data
exchange.
Below is an example of reading alarm information using the EXPLICIT MESSAGE SEND command
(2801) from the PROFIBUS Communication Unit with the following system configuration:
• PROFIBUS Master Unit’s station address: 05
• Unit number: 0
• Unit address: 11 Hex
• GRT1-PRT Communication Unit’s station address: 65
Example of Sending Acyclic Messages Using SendCmd Instruction
Execution Condition _Port_isAvailable *_MstrOperateSta
Execute
DstNetAdr
CommPort
CmdDat
CmdSize
RespDat
Option
Done
Busy
Error
ErrorID
ErrorIDEx
RespDat
sample
SendCmd
Explicit message
PROFIBUS Master Unit No.: 0
GRT1-PRT Communicati
o
Unit station address: 65
Master Unit station address: 05
Unit address: 11 Hex
NJ series CPU Unit
Se n d Cm d