Omron FQM1-MMP21 Processing Time, Interrupt Response Time Calculation Example, Description Time

Programming Appendix A

Processing Time

The time required from when the interrupt factor occurs until the interrupt task is called and the time required from completing the interrupt task until program execution returns to the original position are shown below.

	Item	Description	Time
1	Interrupt input ON delay	This is the additional time required from when the interrupt input contact turns	30 ∝s
		ON until the interrupt is generated. This time applies only to input interrupts.
↓
Interrupt condition established
↓
2	Waiting for interrupt pro-	Time may be required to wait for interrupt prohibition to be released. See	See below.
	hibition to be released	below for details.
↓
3	Switchover time	This is the time required to switch over to interrupt processing.	72 ∝s
↓
Interrupt processing routine executed
↓
4	Return	This is the time from the END(001) in the interrupt task until returning to the	61 ∝s
		process that was being performed when the interrupt occurred.

• Online Editing:	If online editing is performed during operation, operation will be
	stopped for a maximum of 65 ms, during which time interrupts
	will be prohibited and the program will be overwritten.

•Data Exchange with Coordinator Module: Interrupts will be prohibited for 10 ∝s when data is exchanged with the Coordinator Module.

• Analog I/O Refreshing:	Interrupts will be prohibited for approximately 40 ∝s while analog
	conversion is being performed for analog I/O.
• Hardware-supported Instructions:	Some FQM1 ladder instructions are implemented using hard-
	ware. Interrupts will be placed on standby during execution of
	hardware-supported instructions that require time to process,
	such as XFER(070) and BSET(071).

Interrupt Response Time Calculation Example

The interrupt response times from the interrupt input turning ON until the interrupt task is started for when an input interrupt occurs under the following conditions are given below.

•No 1-ms timers are being used.

•No non-fatal errors occur or are cleared.

•Online editing is not performed.

Minimum Response Time
	Interrupt input ON delay:	10 ∝s
	Interrupt prohibition release time: 0 ∝s
+	Switchover time:	72 ∝s
Total: Minimum response time:		82 ∝s
Maximum Response Time
	Interrupt input ON delay:	30 ∝s
	Interrupt prohibition release time: 10 ∝s
+	Switchover time:	72 ∝s
Total: Minimum response time:		112 ∝s

Note (1) To return to the process being performed before the interrupt occurred, the execution time of the interrupt task and 61 ∝s are required in addition to the above response time.

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