Indirect Connection refers to what type of interface between a PLC and another machine controller?

Indirect Connection refers to what type of interface between a PLC and another machine controller?

• A. Directly Wired Terminals
• B. Involves An Intermediary Connection Rather Than Wiring Terminals Directly
• C. Wireless Direct Link
• D. USB Tethering

Answer: (B)

Indirect Connection means the PLC and the other machine controller communicate through an intermediary interface rather than wiring from terminals to terminals. In practice, this uses a network, fieldbus, gateway, or other communications interface so data, commands, and status are exchanged as messages rather than hard-wired signals. This is why the option describing an intermediary connection is the best. It captures the idea that there’s a middle layer handling the communication, not a direct, point-to-point wiring between the two controllers. Directly wired terminals would involve running individual wires from one controller’s outputs to the other controller’s inputs, which is not an indirect interface. A wireless direct link can be a direct path as well, and USB tethering is a specific, nonstandard method for peripheral connections rather than the general PLC-to-machine interface concept.

Indirect Connection means the PLC and the other machine controller communicate through an intermediary interface rather than wiring from terminals to terminals. In practice, this uses a network, fieldbus, gateway, or other communications interface so data, commands, and status are exchanged as messages rather than hard-wired signals.

This is why the option describing an intermediary connection is the best. It captures the idea that there’s a middle layer handling the communication, not a direct, point-to-point wiring between the two controllers. Directly wired terminals would involve running individual wires from one controller’s outputs to the other controller’s inputs, which is not an indirect interface. A wireless direct link can be a direct path as well, and USB tethering is a specific, nonstandard method for peripheral connections rather than the general PLC-to-machine interface concept.