LG Electronics 120S - page 87

Chapter 7 Usage of Various Functions
7-3
4) External interface circuit
Signal name
I/O Internal circuit Termi
nal
No. 1Phase 2Phase
Operati
on
Input warranted
voltage
On 20.4~28.8V
P00
Ch0
Input
pulse
Ch0 A
Phase
Input Off 6V or lower
On 20.4~28.8V
P01
Ch1
Input
pulse
Ch0 B
Phase
Input Off 6V or lower
On 20.4~28.8V
P02
Ch2
Input
pulse
Ch2 A
Phase
Input Off 6V or lower
On 20.4~28.8V
P03
Ch3
Input
pulse
Ch2 B
Phase
Input Off 6V or lower
Input
COM
0 Common
On 20.4~28.8V
P04
Ch0
Preset
input
Ch0
Preset
input Off 6V or lower
On 20.4~28.8V
P05
Ch1
Preset
input
- Off 6V or lower
On 20.4~28.8V
P06
Ch2
Preset
input
Ch2
Preset
input Off 6V or lower
On 20.4~28.8V
P07
Ch3
Preset
input
-
Off 6V or lower
Input
COM
0 Common
5) Wiring instructions
A high speed pulse input is sensitive to the external noise and should be handled with special care. When wiring the built-in
high speed counter of MASTER-K120S, take the following precautions against wiring noise.
(1) Be sure to use shielded twisted pair cables. Also provide Class 3 grounding.
(2) Do not run a twisted pair cable in parallel with power cables or other I/O lines which may generate noise.
(3) Before applying a power source for pulse generator, be sure to use a noise-protected power supply.
(4) For 1-phase input, connect the count input signal only to the phase A input; for 2-phase input, connect to phases A and B.
3.3 kΩ
3.3 kΩ
3.3 kΩ
3.3 kΩ
3.3 kΩ
3.3 kΩ
3.3 kΩ
3.3 kΩ