EL3174 – Introduction
Fig.71: EL3174EtherCAT Terminal, 4-channel analog input, multi-function, ±10 V, ±20 mA, 16-bit
The EL3174 analog input terminal has four individually parameterizable inputs. Signals either in the range -10/0 … +10 V or in the range -20/0/+4 … +20 mA can be processed per channel.
Physically, the voltage and current signals should be connected to different terminal points. Each channel should then be set by the controller/TwinCAT to U or I mode via CoE. The voltage inputs operate differentially; the current inputs are single-ended.
All inputs are digitized with a resolution of 16 bits and transmitted, electrically isolated, to the higher-level automation device. With a technical measuring range of ±107 % of the nominal range, the terminal also supports commissioning with sensor values in the limit range and the evaluation according to NAMUR NE43.
 | 107 % extended range The EL3174/ EL3174-00xx are pre-set to 107 % measuring range, e.g. 0x7FFF corresponds to +10.737 V or 3.22 V. The previously known legacy range can be reset via CoE access. Then 0x7FFF will correspond to the full scale value again (FSV, e.g. 10 V/ 3 V). |