Omron FQM1-CM001 Example of Calculating the Cycle Time, Online Editing Cycle Time Extension

Programming Appendix A

Example of Calculating the Cycle Time

An example is given here for FQM1-MMP21 Motion Control Modules connected to a Coordinator Module.

Conditions

Item	Condition
Motion Control Modules	FQM1-MMP21	2 Modules
User program	5 Ksteps	LD: 2.5 Ksteps
		OUT: 2.5 Ksteps
Peripheral port connection	None
Constant cycle time setting	None
RS-232C port connection	None
RS-422A port connection	None
Other peripheral servicing	None

Calculation Example for FQM1-MMP21

	Process	Calculation	Processing time
			Without CX-Programmer
			connected to peripheral port
1.	Overseeing	---	0.029 ms
2.	Program execution	40 ∝s + 0.1 ∝s ⋅ 500 + 0.35 ∝s ⋅ 500	0.265 ms
3.	Cycle time calculation	(No cycle time set)	0.008 ms
4.	I/O refresh		0.048 ms
5.	Cyclic refresh		0.021 ms
6.	Sync bus Refresh		(In Async Mode: 0 ms)
7.	Peripheral servicing		0.04 ms
Cycle time		1. + 2. + 3. + 4. + 5. + 7.	0.411 ms

Online Editing Cycle Time Extension

When online editing is executed from the CX-Programmer while the FQM1 is operating in MONITOR mode to change the program, the Coordinator Module will momentarily suspend operation while the program is being changed. The period of time that the cycle time is extended is determined by the following conditions.

•The number of steps that is changed

•Editing operations (insert/delete/overwrite)

•Instructions used

The cycle time extension for online editing will be negligibly affected by the size of largest task program. If the maximum program size for each task is 5 Ksteps, the online editing cycle time extension will be as shown in the following table.

Module	Online editing cycle time extension
FQM1-CM001	65 ms max., 14 ms typical
	(for a program size of 5 Ksteps)
FQM1-MMP21/MMA21

When editing online, the cycle time will be extended by the above time.

Note When there is only one task, online editing is processed entirely in the cycle time following the cycle in which online editing is executed. When there are multiple tasks (cyclic task and interrupt tasks), online editing is separated, so that for n tasks, processing is executed over n to n ⋅ 2 cycles max.

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