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Automating Manufacturing Systems - Process Control and ...

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plc memory - 14.16<br />

between 3 <strong>and</strong> 999.<br />

3. Program files 0 <strong>and</strong> 1 are reserved for system functions. File 2 is the default ladder logic program,<br />

<strong>and</strong> files 3 to 999 can be used for other programs.<br />

4. binary, octal, BCD, 2s compliment, signed binary, floating point, bits, hexadecimal<br />

5. both are similar. The timer <strong>and</strong> counter memories both use words for the accumulator <strong>and</strong> presets,<br />

<strong>and</strong> they use bits to track the status of the functions. These bits are somewhat different,<br />

but parallel in function.<br />

6. Inputs cannot be changed by the program, <strong>and</strong> some of the status bits/words cannot be changed<br />

by the user.<br />

7.<br />

door open<br />

seat belt connected<br />

Inputs<br />

door open<br />

seat belt connected<br />

key on<br />

key on<br />

Outputs<br />

buzzer<br />

light<br />

TON<br />

Timer T4:0<br />

Delay 5s<br />

T4:0/TT<br />

door open<br />

buzzer<br />

TOF<br />

Timer T4:1<br />

Delay 10s<br />

T4:1/DN<br />

key on<br />

light<br />

8. S2:1/14 for micrologix, S2:1/15 for PLC-5.

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