Omron FQM1-CM001, FQM1-MMA21 7-6-8Time Measurement with the Pulse Counter, Pulse Outputs, Section

Pulse Outputs Section 7-6

7-6-8 Time Measurement with the Pulse Counter

The one-shot pulse output function can be used to create a high-precision pulse counter timer.

To measure time with high-precision, start the timer by executing the STIM(980) instruction with C1 = 000B or 000C and C2 = 0000, and stop the timer by executing STIM(980) with C1 = 000B or 000C and C2 = 0001.

Counting mode (Time measurement)

Timer start condition

Timer started by executing

STIM with C2 = 0000.

Timer stop condition

Timer stopped by executing

STIM with C2 = 0001.

Timer PV in

A620 and A621PV held or A622 and A623

PV reset

Time

Elapsed time

The timer’s elapsed time is stored in 8-digit hexadecimal in words A621 and A620 (pulse output 1) or A623 and A622 (pulse output 2). When the timer starts, the corresponding words are initialized to 0000 0000 hex and the con- tent is incremented as time passes. The final value is retained when the timer stops.

Word	Bits	Function		Contents
A620	00 to 15	Pulse time	Lower	Contains the pulse counter’s time mea-
		measurement	4 digits	surement in 8-digit hexadecimal.
		1		The content can range from 0000 0000
A621	00 to 15		Upper
			4 digits	to FFFF FFFF hex.
				Note These words are refreshed dur-
				ing the Motion Control Module’s
				I/O refreshing.
A622	00 to 15	Pulse time	Lower	These words function just like the
		measurement	4 digits	words for pulse time measurement 1,
		2		described above.
A623	00 to 15		Upper
			4 digits

Set the pulse output operation mode to Calculation (time measurement) in advance in the System Setup, as shown in the following table.

Tab page	Function	Details
Pulse Output	Pulse output 1 − Operation mode	Calculation (time measurement)
	Pulse output 2 − Operation mode

Note (1) The external pulse output from the port is disabled when this mode is se- lected.

(2)A pulse output port that is being used as a pulse counter timer cannot be used for any other pulse output functions.

178