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MELSEC-Q
5 BASIC USAGE
POINT
For 1-phase pulse input and counting up, make sure that the phase B pulse input
and CH
Down count command (Y3, YB) are off before inputting pulses to phase
A.
When the phase B pulse input or CH
Down count command (Y3, YB) is on,
pulses are counted down in phase A pulse input.
(1) Phase 1 pulse input
For phase 1 pulse input, either a multiple of 1 or multiple of 2 count method can
be selected.
The following figure shows the relationship between phase A pulse input and
phase B pulse input or CH
Down count command (Y3, YB).
A
B
Pulse input
Encoder
QD62(E/D)
B or CH Down count command
(Y3, YB)
(2) CW/CCW pulse input
For CW/CCW pulse input, the up count is performed when there is a phase A
pulse input, and the down count is performed when there is a phase B pulse input.
The relationship between the phase A pulse input and phase B pulse input is
shown below.
Addition pulse input
Subtraction pulse input
Encoder
QD62(E/D)
A
B
Encoder
(3) Phase 2 pulse input
For phase 2 pulse input, either a multiple of 1, multiple of 2, or multiple of 4 count
method can be selected.
The phase difference between the phase A pulse and phase B pulse determines
whether the up count or down count is performed.
The relationship between the phase A pulse input and phase B pulse input is
shown below.
Phase A pulse input
Phase B pulse input
QD62(E/D)
Encoder
A
B
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