Introduction
Fig.4: EL33111 channel analog thermocouple input terminals with open-circuit recognition
The EL3311 analog input terminals allow the direct connection of thermocouples. The EtherCAT Terminals circuit can operate thermocouple sensors using the 2-wire technique. Linearization over the full temperature range is realized with the aid of a microprocessor. The temperature range can be selected freely. The error LEDs indicate a broken wire. Compensation for the cold junction is made through an internal temperature measurement at the terminals. The EL33xx can also be used for mV measurement.