NAiS FP1, Hardware Manual

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2. Relays and Timer/Counter Contacts in the FP1
The FP1 programmable controller contains many relays and timer/counter contacts as follows.
Input terminals
External input relay (X)
This relay feeds signals to the programmable controller from an external input
device such as a limit switch or photoelectric sensor.
External output relay (Y)
This relay outputs the program execution result of the programmable controller
and activates an external output device such as a solenoid or motor.
Internal relay (R)
This relay does
not provide an
external output
and can be used
only within the
programmable
controller.
Counter contact (C)
This contact is the
output of the
counter instruction
(CT). If a counter
instruction counts
up, the contact with
same number turns
ON.
Timer contact (T)
This contact is the
output of the timer
instruction (TM). If
a timer instruction
times out, the
contact with the
same number
turns ON.
Output terminals
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4-2. How to Program the Programmable Controller 4-2. How to Program the Programmable Controller