TwinSAFE SC: 4-channel analog input terminal 4…20 mA, differential input, 16 bit EL3124-0090
Error LED 4
Run LED
Error LED2
Run LED
Error LED3 
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

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. The standard functions and features of the I/Os remain available. The data from these TwinSAFE SC I/Os is fed to the TwinSAFE Logic, where they undergo safety-related multi-channel processing. In the Safety Logic the data originating from different sources is analysed, checked for plausibility and submitted to a “voting”. This is done by certified function blocks such as Scale, Compare/Voting (1oo2, 2oo3, 3oo5), Limit, etc. For safety reasons, however, at least one of the data sources must be a TwinSAFE SC component. The remainder of the data can originate from other standard Bus Terminals, drive controllers or measuring transducers.

With the aid of the TwinSAFE SC technology it is typically possible to achieve a safety level equivalent to PL d/Cat. 3 in accordance with EN ISO 13849-1 or SIL 2 in accordance with EN 62061.

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 85 Ω typ. + diode voltage
Input filter limit frequency 5 kHz
Common-mode voltage UCM 10 V max.
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
Further information
TwinSAFE SC TwinSAFE SC technology
Related products  
EK1960 TwinSAFE Compact Controller
EL6910 TwinSAFE Logic