Answer the following with reference to the process control PLC ladder logic diagram of Figure 1-20 of this chapter:
a. What do the individual symbols represent?
b. What do the numbers represent?
c. What field device is the number I/2 identified with?
d. What field device is the number O/1 identified with?
e. What two conditions will provide a continuous path from left to right across the rung?
f. Describe the sequence of operation of the controller for one scan of the
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