TwinSAFE SC: 4-channel thermocouple input terminal with open-circuit recognition EL3314-0090
Error LED 4
Error LED 3
Error LED 2
Error LED 1
Run LED 4 
Run LED 3 
Run LED 2 
Run LED 1 
Power contact
+24 V
Power contact 0 V
+TC1
+TC2
+TC3
+TC4
-TC1
-TC2
-TC3
-TC4
Top view 
Contact assembly 
Observe for earthed
thermocoupler:
differential inputs
max. ± 2 V to ground
extended temperature range
extended shock and vibration range 25g

EL3314-0090 | TwinSAFE SC: 4-channel thermocouple input terminal with open-circuit recognition

The EL3314-0090 analog input terminal allows four thermocouples to be connected directly. The EtherCAT Terminal circuit can operate thermocouple sensors using the 2-wire technique. A microprocessor handles linearisation across the whole temperature range, which is freely selectable. Compensation for the cold junction is made through an internal temperature measurement at the terminal. The EL3314-0090 can also be used for mV measurement.

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 EL3314-0090
Number of inputs 4
Power supply via the E-bus
Thermocouple sensor types types J, K, L, B, E, N, R, S, T, U (default setting type K), mV measurement
Distributed clocks
Input filter limit frequency typ. 1 kHz; depending on sensor length, conversion time, sensor type
Connection method 2-wire
Wiring fail indication yes
Conversion time approx. 2.5 s up to 20 ms, depending on configuration and filter setting, default: approx. 250 ms
Temperature range in the range defined in each case for the sensor (default setting: type K; -200…+1370 °C); voltage measurement: ±30 mV…±75 mV
Resolution 0.1 °C per digit
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
Bit width in the process image 4 x 32 bit TC input, 4 x 16 bit TC output
Configuration no address setting, configuration via the controller
Special features TwinSAFE SC, open-circuit recognition
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.