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Description
Overview
Essential details：EL3121 BECKHOFF EtherCAT Terminal
The EL3121 analog input terminal processes signals in the range between 4 and 20 mA. The current is digitized to a resolution of 16 bits and is transmitted, electrically isolated, to the higher-level automation device. The input channels of the EtherCAT Terminal have differential inputs and possess a common, internal ground potential. The EL3121 is the single-channel version and is characterized by its fine granularity and electrical isolation. An open lead or overload condition are detected. The terminal status is relayed to the controller via the E-bus. The EtherCAT Terminal indicates its signal state by means of light emitting diodes. The error LEDs indicate an overload condition and a broken wire.
EL3121
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EL3121 BECKHOFF EtherCAT Terminal
| Technical data | EL3121 |
|---|---|
| Number of inputs | 1 (differential) |
| Power supply | via the E-bus |
| Technology | differential input |
| Signal type | differential |
| Signal current | 4…20 mA |
| Distributed clocks | yes |
| Internal resistance | typ. 85 Ω + diode voltage |
| Input filter limit frequency | 5 kHz |
| Common-mode voltage UCM | max. 10 V |
| Conversion time | ~ 40 µs |
| Resolution | 16 bit (incl. sign) |
| Measurement error/ uncertainty | < ±0.3 % (relative to full scale value) |
| Surge voltage resistance | max. 35 V |
| Electrical isolation | 500 V (E-bus/signal voltage) |
| Current consumption power contacts | – |
| Current consumption E-bus | typ. 130 mA |
| Bit width in the process image | inputs: 4 byte |
| Special features | standard and compact process image, activatable FIR/IIR filters, limit value monitoring |
| Weight | approx. 55 g |
| Operating/storage temperature | -25…+60 °C/-40…+85 °C |
| Relative humidity | 95 %, no condensation |
| Vibration/shock resistance | conforms to EN 60068-2-6/EN 60068-2-27 |
| EMC immunity/emission | conforms to EN 61000-6-2/EN 61000-6-4 |
| Protect. rating/installation pos. | IP20/variable |
| Pluggable wiring | for all ESxxxx terminals |
| Approvals/markings | CE, UL, ATEX, IECEx |
| Ex marking | ATEX: II 3 G Ex nA IIC T4 Gc IECEx: Ex ec IIC T4 Gc |
