C-34
PCB-mounting Counters
H7E
@-N
@-N@-N
@-N@P
@P@P
@P
Note that the above calculation provides an approximate value,
which varies depending on the environment under which the Counter
is used and also on the type of capacitors used. Provide some allow-
ance in selecting capacitors.
Keep the wiring between the H7E
@
-N
@
P and R
2
or C as short as
possible (within 50 mm).
Input Connections
Input Connection Contact Input
When the H7EC-NP is used, relay chattering may be counted. Use
the H7EC-NLP, one of the low-speed input models.
Solid State Input
Use a transistor for input that satisfies the following conditions:
Collector breakdown voltage
≥
50 V
Leakage current < 1
µ
A
Use a diode (D) having a forward voltage as small as possible (0.1 V
max. at I
F
of 20
µ
A).
Operation
■
Operating Modes
Reset input Count/Timer input
Or Or
H7E
@
-N
@
P
Relay Relay
Open-collector Transistor Input
Reset input Count/Timer input
H7E
@
-N
@
P
TTL or C-MOS IC Input
Reset input Count/Timer input
TTL or C-MOS IC TTL or C-MOS IC
H7E
@
-N
@
P
H7EC Total Counter H7ET Time Counter
Reset
Counting display values
Full-scale
Count input
Full-scale
Reset
Timer input
Timer display values
Incrementing Operation
(Up)
(Full-scale
−1)
Incrementing Operation
(Up)
Internal clock
timer value
(Full-scale
−0.1
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