Which of the hardwired relay schematics is being implemented by the PLC program shown?
A)(a)
B)(b)
C)(c)
D)(d)

Question

Which of the hardwired relay schematics is being implemented by the PLC program shown? 
A)(a) 
B)(b) 
C)(c) 
D)(d)

Quizplus · Accepted Answer

The PLC program shown matches the hardwired relay schematic (b). This is because the program uses the normally open (NO) contacts of input I0 to control the coil of output Q0, which matches the way the hardwired relay schematic is set up. Option (a) is incorrect because it uses the normally closed (NC) contact of input I1 to control the coil of output Q0. Option (c) is incorrect because it uses a latch circuit to control the output, which is not present in the hardwired relay schematic. Option (d) is incorrect because it uses a different input (I2) than the one used in the hardwired relay schematic.

Which of the Hardwired Relay Schematics Is Being Implemented by the PLC