LG Electronics 120S user manual External interface circuit, Wiring instructions

Chapter 7 Usage of Various Functions

4) External interface circuit

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

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.

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