TwinSAFE SC: 4-channel input terminal PT100 (RTD) for 3-wire connection EL3214-0090
Run LED
Err LED
CH1...4
Power contact
+24 V
Power contact 0 V
+R1 
RL1 
+R2 
RL2 
+R3 
RL3 
+R4 
RL4 
-R1
-R2
-R3
-R4
Top view 
Contact assembly 
extended shock and vibration range

EL3214-0090 | TwinSAFE SC: 4-channel input terminal PT100 (RTD) for 3-wire connection

The EL3214-0090 analog input terminal allows four resistance sensors to be connected directly. The EtherCAT Terminal circuit can operate sensors using the 3-wire technique. A microprocessor handles linearisation across the whole temperature range, which is freely selectable.

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 EL3214-0090
Number of inputs 4
Power supply via the E-bus
Technology 2-/3-wire
Distributed clocks
Input filter limit frequency typ. 1 kHz
Sensor types PT100, PT200, PT500, PT1000, Ni100, Ni120, Ni1000 resistance measurement (e.g. potentiometer, 10 Ω…1.2/4 kΩ), KTY sensors (types see documentation)
Connection method 3-wire
Conversion time approx. 170 ms default setting
Measuring current < 0.5 mA (load-dependent)
Measuring range -200…+850 °C (PT sensors); -60…+250 °C (Ni sensors)
Temperature range -200…+850 °C (PT sensors); -60…+250 °C (Ni sensors)
Resolution 0.1 °C per digit
Measuring error < ±0.5 °C for PT sensors, 4 x 3-wire connection
Electrical isolation 500 V (E-bus/signal voltage)
Current consumption power contacts
Current consumption E-bus typ. 140 mA
Special features TwinSAFE SC, integrated digital filter, limit value monitoring, variable connection technology
Weight approx. 60 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, UL
Further information
TwinSAFE SC TwinSAFE SC technology
Related products  
EK1960 TwinSAFE Compact Controller
EL6910 TwinSAFE Logic