Digital Input
EL1252
 
2-channel digital input terminal with time stamp EL1252
Signal LED1
Input 1
Power contact PE
 Signal LED2
 Input 2
 +24 V
 0 V
 PE
Power contact 0 V
Power contact
+24 V
4-wire
3-wire
2-wire
Top view
Contact assembly
Connection

EL1252 | 2-channel digital input terminal with time stamp

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