The PLC chassis comes in different sizes according to the:
A. size of the program.
B. type of I/O modules used.
C. number of slots they contain
D. all of these.
Answer: C
Share your understanding of this question with the correct explanation.
Explanation:
The correct answer is C. The PLC chassis comes in different sizes according to the number of slots they contain.
PLC chassis or racks are the physical housing that holds the various modules and components of a programmable logic controller (PLC) system. The number of slots in a PLC chassis determines how many modules can be installed in the system.
The size of a PLC chassis is determined by the number of slots it has available to accommodate input/output (I/O) modules, communication modules, processor modules, and other specialized modules. The chassis typically has a backplane that provides electrical connections between the modules.
By having different sizes of chassis with varying numbers of slots, PLC systems can be customized and scaled according to the specific application requirements. Smaller systems may have fewer slots, while larger systems may have more slots to accommodate a higher number of I/O modules and expansion options.
It’s worth noting that the size of the program or the type of I/O modules used does not directly determine the size of the PLC chassis. These factors may influence the overall configuration and requirements of the PLC system, but they are not directly tied to the physical size of the chassis.