Omron CS1W-ETN21 CPU Bus Unit Service Processing Time Local Node, Transmission Processing Time

Communicating between OMRON PLCs Section 6-6

CPU Bus Unit Service Processing Time (Local Node)

The processing time will be as follows, depending on the CPU processing mode settings at the CPU Unit:

CPU execution mode	Processing time considerations
Normal Mode	Set time for peripheral servicing
	(Default: 4% of CPU Unit cycle time)
Priority peripheral servicing
Parallel processing with synchro-
nous memory access
Parallel processing with asynchro-	1 ms max.
nous memory access

For details, refer to the CPU Unit operation manual.

Transmission Processing Time

Number of words sent x 0.002 + 0.550 ms

Transmission Delay

The transmission delay time will be as given below, depending on the baud rate set for the Ethernet Unit. (There may be additional delays depending on devices, such as hubs, in the network configuration.)

Baud rate	Delay time
100Base-TX	Number of words sent ⋅	0.0013 + 0.0118 ms
10Base-T	Number of words sent ⋅	0.0019 + 0.0157 ms

Reception Processing Time

Number of words sent ⋅ 0.003 + 0.704 ms

CPU Bus Unit Service Cycle (Remote Node)

The processing time will be as follows, depending on the CPU processing mode settings at the CPU Unit.

CPU processing	Processing time considerations
mode settings
Normal Mode	CPU Unit cycle time
Priority peripheral ser-	Ethernet Unit is given	Time slice instruction execution
vicing	priority.	time
	Ethernet Unit is not	CPU Unit cycle time
	given priority.
Parallel processing with	CPU Unit cycle time
synchronous memory
access
Parallel processing with	0.2 ms + peripheral servicing time (1 ms max. of peripheral
asynchronous memory	servicing time for each Special I/O Unit, CPU Bus Unit,
access	peripheral port, RS-232C port, or Inner Board)

For details, refer to the CPU Unit operation manual.

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