Using temperature controllers and micro PLCs to speed small-scale automation projects
In addition to DSF PID, these controllers support on/off control and include a heater burnout error detection function. They include EtherNet/IP and EtherCAT for network connectivity and can accept a variety of thermocouple or RTD sensor inputs. You can’t optimize what you don’t measure Power-switching designs, temperature controllers, and thermo management software can’t deliver optimal performance in an information vacuum. Temperature sensors provide the operational data that enables controllers and software to do their jobs. There’s a wide array of temperature sensor technologies available to designers, including: ■ Thermistors function as temperature-sensitive resistors. They typically have repeatability and stability of about ±0.1°C. Model E52-THE5A-0/100C has an operating temperature range of -50°C to 300°C. ■ A Type K temperature sensor is a thermocouple containing chromel and alumel conductors. They can be configured as immersion
sensors, surface sensors, or other styles. Model E52- CA1GTY 2M has an operating temperature range of 0°C to 300°C. ■ RTD sensors are highly accurate, and their immunity to electrical noise makes them suitable for harsh industrial environments. The E52-P6DY 1M platinum pt100 RTD sensor is rated for operation from -50°C to 250°C.
■ Non-contact infrared (IR) sensors like the ES1-LW100-N can measure temperatures of a 35 mm diameter target area at a distance of 1,000 mm. It’s specified for temperatures up to 1,000°C. Tying it together into a system Designers of small- to medium- sized machines with up to 320 I/
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