TwinSAFE SC: 4-channel analog input, -10/0…+10 V, -20/0/+4…+20 mA, 16 bit EL3174-0090
Run LED
Err LED
CH1...4
Power contact
+24 V
Power contact 0 V
Ch1 U+ 
Ch2 U+ 
Ch3 U+ 
Ch4 U+ 
+24 V 
+24 V 
+24 V 
+24 V 
Ch1 U-
Ch2 U-
Ch3 U-
Ch4 U-
Input Ch1
Input Ch2
Input Ch3
Input Ch4
Top view 
Contact assembly 

EL3174-0090 | TwinSAFE SC: 4-channel analog input, -10/0…+10 V, -20/0/+4…+20 mA, 16 bit

The EL3174 analog input terminal has four individually parameterisable inputs. Signals in the range from -10/0 to +10 V or -20/0/+4 to +20 mA can be processed via each channel. Physically, the voltage and current signals should be connected to different terminal points. Each channel should then be set by the controller/TwinCAT to U or I mode via CoE. The voltage inputs operate differentially; the current inputs are single-ended. All inputs are digitised with a resolution of 16 bits and transmitted, electrically isolated, to the higher-level automation device. With a technical measuring range of ±107 % of the nominal range, the terminal also supports commissioning with sensor values in the limit range and diagnostics according to NAMUR NE43.

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 EL3174-0090
Number of inputs 4
Power supply via the E-bus
Technology U differential, I single-ended
Oversampling factor
Distributed clocks yes
Distributed clock precision << 1 µs
Internal resistance > 200 kΩ | typ. 85 Ω
Input filter limit frequency 5 kHz
Common-mode voltage UCM max. 35 V (voltage measurement)
Dielectric strength max. 30 V (current measurement)
Conversion time minimum 150 µs
Measuring range, nominal -10/0…+10 V | -20/0/+4…+20 mA
Measuring range, technical -10.73…+10.73 V | -21.47…+21.47 mA
Resolution 16 bit (incl. sign)
Measuring error < ±0.3 % (relative to full scale value)
Electrical isolation 500 V (E-bus/signal voltage)
Current consumption power contacts
Current consumption E-bus typ. 200 mA
Configuration no address or configuration setting
Special features TwinSAFE SC, U/I parameterisable, ExtendedRange,standard and compact process image, activatable FIR/IIR filters
Weight approx. 65 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
EMC immunity/emission conforms to EN 61000-6-2/EN 61000-6-4
Protect. class/installation pos. IP 20/variable
Approvals CE
Further information
TwinSAFE SC TwinSAFE SC technology
Related products  
EK1960 TwinSAFE Compact Controller
EL6910 TwinSAFE Logic
Product announcement
estimated market release 1st quarter 2018