Programming instructions

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AND/OR conditions can be combined to create complex rungs of logic.
Note: A rung must have an input condition, and an output to be a complete
circuit. If a command is to be always on, there is a bit which can be
placed in front of it, addressed M8000. This bit is always on. Connecting
an output coil or bracketed instruction directly to the left power rail is not
allowed.
10.3 Common Instructions
SET – Bit Set
RST – Bit Reset
The SET
instruction latches the device on. The RST (reset) instruction releases
a latch.
PLS – Rising Edge Pulse
PLF – Falling Edge Pulse
The PLS
instruction triggers on the positive edge of the input condition, while the
PLF instruction triggers on the negative edge of the input condition. Both result
in the pulsing of the specified device ON for just 1 ladder scan.