Omron CJ1W-DRM21 Operation Manual page 332

Appendices
You can change multiple bits to TRUE simultaneously and you can send output data to multiple node
addresses simultaneously.
The following diagram shows the transmission timing. After the COS send instruction is sent to the
DeviceNet (at the I/O refresh timing for the CPU Unit), the COS transmission is executed to each slave
immediately after the refresh (remote I/O communications), which is performed with each slave during
the communications cycle. Therefore, when there are a lot of destination slaves, the COS send timing
may be delayed in order of the node addresses.
CPU Unit user
program
DeviceNet Unit
Slave # 1
Slave # 2
Slave # 3
A-40
Multiple COS send switches (node address #1, #2, #3) changed to
FALSE to TRUE
Node #1 Node #2 Node #3 Node #4 Node #1
Communications cycle time
CJ-series DeviceNet Units Operation Manual for NJ-series CPU Unit(W497)
Time
I/O refresh
COS send instruction
COS COS COS
Node #2 Node #3
#1 #2 #3
Communications cycle time
: I/O using normal connection
: Output using COS (sent to fit in between
normal cycles)
Node #4