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Automating Manufacturing Systems - Process Control and ...

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plc design - 10.8<br />

Description: A h<strong>and</strong>icap door opener has a button that will open two doors. When the button<br />

is pushed (momentarily) the first door will start to open immediately, the second<br />

door will start to open 2 seconds later. The first door power will stay open for a total of<br />

10 seconds, <strong>and</strong> the second door power will stay on for 14 seconds. Use a timing diagram<br />

to design the ladder logic.<br />

Timing Diagram:<br />

door 1<br />

door 2<br />

Ladder Logic:<br />

2s 10s 14s<br />

open button<br />

auto<br />

T4:2/DN<br />

auto<br />

auto<br />

TON<br />

Timer T4:0<br />

Delay 2s<br />

TON<br />

Timer T4:1<br />

Delay 10s<br />

T4:1/TT<br />

T4:2/TT<br />

T4:0/DN<br />

TON<br />

Timer T4:2<br />

Delay 14s<br />

door 1<br />

door 2<br />

Figure 10.5<br />

Design With a Timing Diagram

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