8.a. What is the purpose of relay CRE in the roll stand machine? A. Relay CRE is used as an emergency stop relay. B. Relay CRE is used to control an alarm light. C. Relay CRE is used to power the PLC. D. Relay CRE is used to power the input modules. 8.b. Which one of the following statements is true of a disabled contact or coil? A. The disabled element has been automatically disabled due to module failure. B. The disabled element is held false by the PLC. C. A disabled contact or coil is caused by a faulty memory location in the PLC. D. A contact must be in the disabled state before it can be forced ON or OFF.

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8.a. What is the purpose of relay CRE in the roll stand machine?
A. Relay CRE is used as an emergency stop relay.
B. Relay CRE is used to control an alarm light.
C. Relay CRE is used to power the PLC.
D. Relay CRE is used to power the input modules.

8.b. Which one of the following statements is true of a disabled contact or coil?
A. The disabled element has been automatically disabled due to module failure.
B. The disabled element is held false by the PLC.
C. A disabled contact or coil is caused by a faulty memory location in the PLC.
D. A contact must be in the disabled state before it can be forced ON or OFF. 

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