Problem

(A) For the previous problem, write the low-level language statements for the system using...

(A) For the previous problem, write the low-level language statements for the system using the PLC instruction set in Table 9.7

Table 9.7 Typical Low-Level Language Instruction Set for a PLC

STR

Store a new input and start a new rung of the ladder.

AND

Logical AND referenced with the previously entered component. This is interpreted as a series circuit relative to the previously entered component.

OR

Logical OR referenced with the previously entered component. This is interpreted as a parallel circuit relative to the previously entered component.

NOT

Logical NOT or inverse of the previously entered component.

OUT

Output component for the rung of the ladder diagram.

TMR

Timer component. Requires one input signal to initiate timing sequence. Output is delayed relative to input by a duration specified by the programmer in seconds. Resetting the timer is accomplished by interrupting (stopping) the input signal.

CTR

Counter component. Requires two inputs: One is the incoming pulse train that is counted by the CTR component, the other is the reset signal indicating a restart of the counting procedure.

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