(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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