LG MASTER-K 120S Series User Manual page 87

Chapter 7 Usage of Various Functions
4) External interface circuit
I/O
Input
Input
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.
Internal circuit
3.3 kΩ
3.3 kΩ
3.3 kΩ
3.3 kΩ
3.3 kΩ
3.3 kΩ
3.3 kΩ
3.3 kΩ
Termi
Signal name
nal
1Phase 2Phase
No.
Ch0
P00 Input
pulse
Ch1
P01 Input
pulse
Ch2
P02 Input
pulse
Ch3
P03 Input
pulse
COM
Common
0
Ch0
P04 Preset
input
Ch1
P05 Preset
input
Ch2
P06 Preset
input
Ch3
P07 Preset
input
COM
Common
0
7-3
Operati
Input warranted
on
Ch0 A
On 20.4~28.8V
Phase
Off 6V or lower
Input
Ch0 B
On 20.4~28.8V
Phase
Off 6V or lower
Input
Ch2 A
On 20.4~28.8V
Phase
Off 6V or lower
Input
Ch2 B
On 20.4~28.8V
Phase
Input Off 6V or lower
Ch0
On 20.4~28.8V
Preset
Off 6V or lower
input
On 20.4~28.8V
-
Off 6V or lower
Ch2
On 20.4~28.8V
Preset
Off 6V or lower
input
On 20.4~28.8V
-
Off 6V or lower
voltage