Asked by Ansley Bailey on May 05, 2024
Verified
Hardwired MCRs are used to interrupt power to the I/O rack.
Hardwired MCRs
Master Control Relays that are directly wired and function to control the operation of circuit blocks within a hardwired control system.
I/O Rack
The physical framework in a control system that holds input/output modules, interfacing the processors with field devices.
- Understand the basic concepts and functions of hardware components in programmable logic controllers (PLCs).
Verified Answer
PJ
Prettyme JanetMay 12, 2024
Final Answer :
True
Explanation :
Hardwired MCRs (Master Control Relays) are indeed used to interrupt the power supply to the Input/Output (I/O) rack in industrial control systems. They are typically wired in series with the power line feeding the I/O rack and are controlled by the Programmable Logic Controller (PLC) program. When the PLC program detects a fault condition, it de-energizes the MCR, thereby interrupting power to the I/O rack and preventing further damage or hazards.
Learning Objectives
- Understand the basic concepts and functions of hardware components in programmable logic controllers (PLCs).