









The EL1252 digital input terminal acquires the fast binary control signals from the process level and transmits them, in an electrically isolated form, to the controller. The signals are furnished with a time stamp that identifies the time of the last edge change with a resolution of 1 ns. This technology enables signals to be traced exactly over time and synchronised with the distributed clocks across the system. With this technology, machine-wide parallel hardware wiring of digital inputs or encoder signals for synchronisation purposes is often no longer required. In conjunction with the EL2252 EtherCAT Terminal (digital output terminal with time stamp), the EL1252 enables responses with equidistant time intervals, largely independent of the bus cycle time.
| Technical data | EL1252 | ES1252 |
|---|---|
| Number of inputs | 2 |
| Nominal voltage | 24 V DC (-15 %/+20 %) |
| “0“ signal voltage | -3…+5 V (similar to EN 61131-2, type 3) |
| “1“ signal voltage | 11…30 V (similar to EN 61131-2, type 3) |
| Input current | typ. 3 mA (similar to EN 61131-2, type 3) |
| Resolution time stamp | 1 ns |
| Precision of time stamp in the terminal | 10 ns (+ input delay) |
| Distributed clock precision | < 100 ns |
| Input delay TON/TOFF | < 1 µs |
| Current consumption E-bus | typ. 110 mA |
| Electrical isolation | 500 Vrms (E-bus/field potential) |
| Bit width in the process image | 2 inputs + 36 byte time stamp |
| Configuration | no address or configuration setting |
| Weight | approx. 55 g |
| Operating/storage temperature | 0…+55 °C/-25…+85 °C |
| Relative humidity | 95 %, no condensation |
| Vibration/shock resistance | conforms to EN 60068-2-6/EN 60068-2-27/29 |
| EMC immunity/emission | conforms to EN 61000-6-2/EN 61000-6-4 |
| Protect. class/installation pos. | IP 20/variable |
| Pluggable wiring | for all ESxxxx terminals |