Analog input
EP3314 | 4-channel analog input thermocouple
M12 I/O
connection sockets
Signal status display
Labelling areas
Power supply
status display:
Box supply (US)
Auxiliary voltage (UP)
1 | Compen-
 sation A
2 | Input +
3 | Ground
4 | Input -
5 | Shield
1 | Tx+
2 | Rx+
3 | Rx-
4 | Tx-
1 | + 24 V DC Us
2 | + 24 V DC UP
3 | GNDs
4 | GNDP
Power supply feed
Power supply down-
stream connection
signal input
signal output
extended temperature range

EP3314-0002 | 4-channel analog input thermocouple

The EP3314 EtherCAT Box with analog inputs permits four thermocouples to be directly connected. The module’s 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 a temperature measurement in the connecting plugs. This means that standard extension leads can be connected. The EP3314 can also be used for mV measurement.

The module is quite versatile, but the default values are selected in such a way that in most cases it is not necessary to perform configuration. The input filter and associated conversion times can be set within a wide range; several data output formats may be chosen. If required, the inputs can be scaled differently. Automatic limit monitoring is also available. Parameterisation is carried out via EtherCAT. The parameters are stored in the module. For the temperature compensation a PT1000 element is needed. Beckhoff offers a connector with temperature compensation (ZS2000-3712).

Technical data EP3314-0002
Number of inputs 4
Connection method screw type M12, 2-wire connection for thermocouple
Protocol EtherCAT
Bus interface 2 x M8 socket, shielded, screw type
Sensor types types J, K, L, B, E, N, R, S, T, U (default setting type K), mV measurement
Signal type thermocouple
Measuring range depending on sensor type; preset value is type K, -100…+1,370 °C
Resolution 0.1 °C per digit
Measuring error < ±0.3 % for type K (relative to full scale value), further types see documentation
Conversion time 2.5 s up to 20 ms, see documentation, default: approx. 250 ms
Nominal voltage 24 V DC (-15 %/+20 %)
Distributed clocks
Input filter 5 variations, configurable
Sensor supply
Current consumption from US (without sensor current) 120 mA
Power supply connection feed: 1 x M8 male socket, 4-pin; downstream connection: 1 x M8 female socket, 4-pin
Bit width in the process image 4 x 32 bit TC input, 4 x 16 bit TC output
Electrical isolation 500 V
Special features open-circuit recognition
Weight approx. 165 g
Operating/storage temperature -25…+60 °C/-40…+85 °C
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 65/66/67 (conforms to EN 60529)/variable
Approvals CE, UL, Ex
ZK1090-3xxx-xxxx Cables for EtherCAT signal in- and -output
ZK2000-71xx-0xxx Shielded cables for M12 I/O connection sockets
ZK2000-6xxx-xxxx Cables for M12 I/O connection sockets
ZK2020-xxxx-xxxx Cables for M8 power supply
Related products  
EQ3314-0002 EtherCAT Box, stainless steel housing, 4 analog inputs for thermocouples, type J,K,L…U, 16 bit