A PLC component suitable for interfacing temperature sensors like thermocouples is best described as a:

A PLC component suitable for interfacing temperature sensors like thermocouples is best described as a:

• A. Special module
• B. Analog output module
• C. Digital input module
• D. Relay module

Answer: (A)

Interfacing temperature sensors such as thermocouples with a PLC requires handling very small, low-level signals with proper conditioning, including cold-junction compensation and scaling to the PLC’s input range. This is provided by a module designed specifically for temperature sensing, often labeled as a special module in PLC catalogs. Such a module incorporates the signal conditioning needed for thermocouples and presents a suitable analog input to the PLC, making it the appropriate choice. The other options don’t fit because a digital input module reads only binary signals, a relay module provides switching contacts, and an analog output module sends out varying signals rather than reading them. A specialized thermocouple/interface module is the correct type for this sensing role.

Interfacing temperature sensors such as thermocouples with a PLC requires handling very small, low-level signals with proper conditioning, including cold-junction compensation and scaling to the PLC’s input range. This is provided by a module designed specifically for temperature sensing, often labeled as a special module in PLC catalogs. Such a module incorporates the signal conditioning needed for thermocouples and presents a suitable analog input to the PLC, making it the appropriate choice.

The other options don’t fit because a digital input module reads only binary signals, a relay module provides switching contacts, and an analog output module sends out varying signals rather than reading them. A specialized thermocouple/interface module is the correct type for this sensing role.