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4-6 Micro PLC Programmer’s Guide – April 1994
GFK-0804B
Programming a Normally-Open Contact in Series
When a Normally-Open contact is not the first element of the rung, program an AND
with the HHP, as shown below. The example shows how to use the HHP to program a
Normally-Open contact at the first and second positions in a rung.
Ladder Diagram Hand-held Programmer
AND operation of inputs I1 and I2;
output O17 is 1 when I1 and I2 are
both 1.
I1 O17
START
AND
OUT
I2
I1
I2
O17
Timing Diagram
Input I1
Output O17
Input I2
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Programming a Normally-Open Contact in Parallel
To enter a Normally-Open contact in parallel, as shown by I2 in the following example,
program an OR with the HHP.
Ladder Diagram Hand-held Programmer
Timing Diagram
OR operation of inputs I1 and I2.
The output O17 is 1 when either I1
or I2 is 1.
I1 O17
START
OR
OUT
I1
I2
O17
Input I1
Output O17
I2
Input I2
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