■ When inputting pulse train with terminals [X6] and [X7]
If connecting to an open collector output pulse generator, it may not be possible to correctly recognize input
pulses due to the stray capacitance of the wiring. In response to this, if the changeover switch is set to the
SINK side, connect a pull-up resistor between the open collector output signals (terminals [X6], [X7]) and the
power supply (terminal [PLC]), and if the changeover switch is set to the SOURCE side, connect a pull-down
resistor between the open collector output signals (terminals [X6], [X7]) and the digital common (terminal
[CM]). 1 kΩ, 2 W pull-up and pull-down resistors are recommended. The stray capacitance of wiring varies
greatly depending on such factors as the wire type and method in which wiring is laid. It is therefore necessary
to check whether it is possible to recognize pulse train input correctly.
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