Cycle Time Calculation Example; Increase In Cycle Time For Online Editing - Omron SYSMAC CP Series Instruction & Reference Manual

4 Monitoring and Computing the Cycle Time
4-2-4

Cycle Time Calculation Example

The following example shows the method used to calculate the cycle time when Expansion I/O Units
are connected to a CP1E CPU Unit.
Conditions
CP1E CPU Unit
Ladder diagram
Peripheral USB port connection
Minimum cycle time processing
Serial port connection
Other peripheral servicing
Calculation Example
Process name
(1)Overseeing
(2)Program execution
(3)Cycle time calculation
(4)I/O refreshing
(5)Peripheral servicing
Cycle time
4-2-5

Increase in Cycle Time for Online Editing

When online editing is executed to change the program from the CX-Programmer while the CPU Unit is
operating in MONITOR mode, the CPU Unit will momentarily suspend operation while the program is
being changed. The cycle time is extended by the writing programs for the CPU Unit. And the schedule
task will not be executed while the CPU Unit suspends operation.
If the program size is 8K steps, the cycle time extension will be as follows:
CPU Unit
CP1E CPU Unit
When editing online, the cycle time will be extended and the schedule task execution may be delayed or
become abnormal according to the editing that is performed.
4-6
Item
40-point I/O Unit
CP1W-40EDR
5K steps
Yes or no
None
None
None
1.19µs×2,500+1.61µs×2,500
(Minimum cycle time not set.)
0.45 ms
(Only peripheral USB port connected)
(1)+(2)+(3)+(4)+(5)
Increase in cycle time for online editing
Maximum: 16 ms, Normal: 6 ms (for a program size of
8K steps)
Description
Equation
Peripheral USB
port connected
−
CP1E CPU Unit Instructions Reference Manual(W483)
1 Unit
LD instructions: 2.5K steps
OUT instructions: 2.5K steps
Processing time
Peripheral USB
port not
connected
0.4 ms 0.4 ms
7.0 ms 7.0 ms
0 ms 0 ms
0.45 ms 0.45 ms
0.2 ms 0 ms
8.15 ms 7.85 ms