LC2H
Preset Counter
3
CAUTIONS FOR USE
Input and output connection
Input connection
• Contact input
Use highly reliable metal plated contacts. Since the
contact's bounce time leads directly to error in the count
value, use contacts with as short a bounce time as
possible.
In general, select input to have a maximum counting
speed of 30 Hz.
1
3 4
2
Reset
input
Count
input
5
6
• Non-contact input (Transistor input)
Connect with an open collector. Use transistors whose
characteristics satisfy the criteria given below.
V
CEO
= Min. 20 V
I
C
= Min. 20 mA
I
CBO
= Max. 6 μA
Also, use transistors with a residual voltage of less than 2
V when the transistor is on.
* The short-circuit impedance should be less than 1 kΩ.
When the impedance is 0 Ω, the current coming from the
count input terminal is approximately 5 mA and from the
reset input terminal is approximately 1.5 mA.
Also, the open-circuit impedance should be more than
100 kΩ.
1 2
3 4
Reset
input
Count
input
5
6
• Input wiring
When wiring, use shielded wires or metallic wire tubes,
and keep the wire lengths as short as possible.
Output connection
Since the transistor output of counter is insulated from the
internal circuitry by a photo-coupler, it can be used as an
NPN output or PNP (equal value) output.
1 2
5
6
Load
Load's
power
supply
+
–
1 2
3
3
4
4
5
6
Load
Load's
power
supply
+
–
As NPN output
As PNP output
Self-diagnosis function
If a malfunction occurs, one of the following displays will
appear.
Display Contents Output
condition
Restoration
procedure
Preset
values after
restoration
Err-00
Malfunctioning
CPU
OFF
Enter front
reset key
or restart
counter
The preset value at
start-up before the CPU
malfunction occurred.
Err-01
Malfunctioning
memory*
0
* Includes the possibility that the EEPROM's life has expired.
Terminal connection
• When wiring the terminals, refer to the terminal layout
and wiring diagrams and be sure to perform the wiring
properly without errors.
An external power supply is required in order to run the
main unit.
Power should be applied between terminals and .
Terminal acts as the positive "+"connection and
terminal as the negative "–".
1
Operating voltage
+
–
2
3
4
5
6
• After turning the counter off, make sure that any resulting
induced voltage or residual voltage is not applied to
power supply terminals through . (If the power
supply wire is wired parallel to the high voltage wire or
power wire, an induced voltage may be generated at the
power supply terminal.)
• Have the power supply voltage pass through a switch or
relay so that it is applied at one time.
