Omron FQM1-MMP21 Pulse Input Function Description, High-speed Counter Function Description

Pulse Inputs Section 7-5

7-5-8 Pulse Input Function Description

The pulse input function uses the high-speed counters. The pulse input func- tion can be used to monitor changes (movement) in the high-speed counter PV (mode 1) or changes in the high-speed counter frequency (mode 2).

High-speed Counter Function Description

Input Signal Type and Count Mode

High-speed counters 1 and 2 support the following inputs. The input method application depends on the signal type.

Phase Differential Inputs

This method uses the phase Z signal and the two phase signals (phase A and phase B) for a ⋅1, ⋅2, or ⋅4 phase differential. The count is incremented or decremented according to the offset between the two phase signals.

Increment/Decrement Pulse Inputs

The phase-A signal is the UP pulse and the phase-B signal is the DOWN pulse. The count is incremented or decremented by these pulses.

Pulse + Direction Inputs

The phase-A signal is the pulse signal and the phase-B signal is the direction signal. The count is incremented or decremented based on the ON/OFF sta- tus of the phase-B signal.

■Phase Differential Input Operation

Phase A

Phase B

⋅1 multiplier

⋅2 multiplier

0		1		2		3			2		1			2
0	1	2	3	4	5	6	5	4	3	2	1	2	3	4

⋅4 multiplier 0 1 2 3 4 5 6 7 8 9 1011 12			1110 9 8 7 6 5 4 3 2 1		2 3 4 5 6 7 8
Phase A	Phase B	⋅1 multiplier		⋅2 multiplier	⋅4 multiplier
↑	L	Increment		Increment	Increment
H	↑	---		---	Increment
↓	H	---		Increment	Increment
L	↓	---		---	Increment
L	↑	---		---	Decrement
↑	H	---		Decrement	Decrement
H	↓	---		---	Decrement
↓	L	Decrement		Decrement	Decrement

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