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4-13GFK-0804B Chapter 4 The Micro PLC Instruction Set
Set/Reset Coil Pair
The Set/Reset coil pair can be used to control the state of an associated reference. The Set
coil sets the reference to 1. The reference (O17 in the example below) STAYS set to 1 until
it is reset to 0 by the Reset coil. Notice that the Set and Reset coil are programmed with
the same associated reference; that of reference being controlled.
In the example below, the Set coil and Reset coil are shown in adjoining rungs of logic.
That is not necessary, however.
Programming Software Instructions
If you are using the programming software, refer to the instructions on page 4-11.
Example and HHP Instructions
Set Reset
Ladder Diagram Hand-held Programmer
Timing Diagram
This is a flip-flop operation. Input I1 sets
output O17 to 1. Output O17 remains 1
even if I1 changes to 0. Output O17 is only
reset to 0 when I2 is activated.
When both I1 and I2 are ON, the last
occurrence in the scan (RST in this case)
takes precedence.
I1 O17
START
OUT
START
OUT
F2 (SET)
F2 (RESET)
I1
O17
I2
O17
Input I1
Output O17
SET RST
SET
RST
I2 O17
Input I2
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