EL3311, EL3312 | 1-, 2-channel thermocouple input terminals with open-circuit recognition

The EL3311 and EL3312 analog input terminals allow thermocouples to be connected directly. The EtherCAT Terminals circuit can operate thermocouple sensors using the 2-wire technique. Linearisation over the full temperature range is realised with the aid of a microprocessor. The temperature range can be selected freely. The error LEDs indicate a broken wire. Compensation for the cold junction is made through an internal temperature measurement at the terminals. The EL3311/EL3312 can also be used for mV measurement.

Technical data	EL3311	EL3312
Number of inputs	1	2
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
Connection method	2-wire
Temperature range	in the range defined in each case for the sensor (default setting: type K; -100…+1,370 °C)
Resolution	0.1 °C per digit
Wiring fail indication	yes
Conversion time	approx. 750 ms up to 20 ms, depending on configuration and filter setting, see documentation, default: approx. 75 ms	approx. 1.2 s up to 20 ms, depending on configuration and filter setting, see documentation, default: approx. 125 ms
Measuring error	< ±0.3 % (relative to full scale value)
Electrical isolation	500 Vrms (E-bus/signal voltage)
Current consumption E-bus	200 mA
Bit width in the process image	1 x 32 bit TC input, 1 x 16 bit TC output	2 x 32 bit TC input, 2 x 16 bit TC output
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 60068-2-27/29
EMC immunity/emission	conforms to EN 61000-6-2/EN 61000-6-4
Protect. class/installation pos.	IP 20/variable