GE GFK-0804B 用户手册
4
4-7
GFK-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.
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.
position in a rung, as explained below.
Programming Normally-Closed Contact at the Start of a Rung
When a Normally-Closed contact is the first element of the rung, program a
START NOT, as shown below.
START NOT, as shown below.
Ladder Diagram
Hand-held Programmer
I2
O18
START
OUT
OUT
II2
O18
O18
F3 (NOT)
The output O18 status is the
reverse signal of input I2, when
I2=1, output O18=0.
reverse signal of input I2, when
I2=1, output O18=0.
Input I2
Output O18
Timing Diagram
46017