GE GFK-0804B Normally-Closed Contact

4
4-7GFK-0804B Chapter 4 The Micro PLC Instruction Set
Normally-Closed Contact
A Normally-Closed contact passes power flow to the right when the associated reference
is equal to 0.
Programming Software Instructions
If you are using the programming software, refer to the instructions on page 4-4.
Examples and HHP Instructions
The HHP programming keystrokes to create a Normally-Closed contact depend on its
position in a rung, as explained below.
Programming Normally-Closed Contact at the Star t of a Rung
When a Normally-Closed contact is the first element of the rung, program a
STARTNOT, as shown below.
Ladder Diagram Hand-held Programmer
I2 O18 START
OUT II2 O18
F3 (NOT)
The output O18 status is the
reverse signal of input I2, when
I2=1, output O18=0.
Input I2
Output O18
Timing Diagram
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