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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 ×4 multiplier
↑ L Increment Increment Increment
H ↑ --- --- Increment
↓ H --- Increment Increment
L ↓ --- --- Increment
L ↑ --- --- Decrement
↑ H --- Decrement Decrement
H ↓ --- --- Decrement
↓ L Decrement Decrement Decrement
0
Phase A
123212
012345 6 5432 1 234
0 123456789101112111098765432 1 2345678
Phase B
×1 multiplier
×2 multiplier
×4 multiplier