TwinSAFE SC: 4-channel analog input terminal 4…20 mA, differential input, 16 bit EL3124-0090
Error LED 4
Run LED
Error LED 2
Run LED
Error LED 3 
Run LED 
Error LED 1 
Run LED 
Power contact
+24 V
Power contact 0 V
+Input 1
-Input 1
+Input 3
-Input 3
+Input 2
-Input 2
+Input 4
-Input 4
Top view 
Contact assembly 
extended temperature range
extended shock and vibration range 25g

EL3124-0090 | TwinSAFE SC: 4-channel analog input terminal 4…20 mA, differential input, 16 bit

The EL3124-0090 analog input terminal handles signals in the range from 4 to 20 mA. The current is digitised to a resolution of 16 bits and is transmitted, in an electrically isolated form, to the higher-level automation device. The input channels of the EtherCAT Terminal have differential inputs and possess a common, internal ground potential.

With the aid of the TwinSAFE SC technology (TwinSAFE Single Channel) it is possible to make use of standard signals for safety tasks in any network or fieldbus. To do this, EtherCAT I/Os from the areas of analog input, position measurement or communication (4…20 mA, incremental encoder, IO-Link, etc.) are extended by the TwinSAFE SC function. The properties typical for the signals and the standard functions of the I/O components are retained. TwinSAFE SC I/Os differ optically from standard I/Os by a yellow stripe on the front of the housing.

The TwinSAFE SC technology enables communication via a TwinSAFE protocol. These connections can be distinguished from the usual secure communication via Safety over EtherCAT.

The data from the TwinSAFE SC components is fed via a TwinSAFE protocol to the TwinSAFE Logic, where it can be used in the context of safety-relevant applications. Detailed examples confirmed/calculated by the TÜV SÜD for the correct application of the TwinSAFE SC components and the respective normative classifications can be found in the TwinSAFE application manual.

Technical data EL3124-0090
Number of inputs 4 (differential)
Power supply via the E-bus
Technology differential input
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 ~ 100 µs
Resolution 16 bit (incl. sign)
Measuring error < ±0.3 % (relative to full scale value)
Surge voltage resistance 35 V DC
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: 16 byte
Configuration no address or configuration setting
Special features TwinSAFE SC, standard and compact process image, activatable FIR/IIR filters, limit value monitoring
Weight approx. 60 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. class/installation pos. IP 20/variable
Approvals CE, UL, Ex
Related products  
EK1960 TwinSAFE Compact Controller
EL6910 TwinSAFE Logic
System  
TwinSAFE SC For further TwinSAFE SC products please see the system overview.