4

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 Start of a Rung

When a Normally-Closed contact is the first element of the rung, program a

START NOT, as shown below.

46017

Ladder Diagram

I2O18

Timing Diagram

Input I2

Output O18

Hand-held Programmer

START

F3 (NOT)

II2

OUT

 

O18

The output O18 status is the reverse signal of input I2, when I2=1, output O18=0.

GFK-0804B

Chapter 4 The Micro PLC Instruction Set

4-7

Page 48
Image 48
GE GFK-0804B manual Normally- Closed Contact, Programming Normally-Closed Contact at the Start of a Rung