Thermocouple (TC)

Comparative overview of Beckhoff thermocouple (TC) devices (terminals, boxes, modules)

The following table is intended to provide a quick overview of the available Beckhoff I/O devices for the direct connection of thermocouples for temperature and mV measurement.

Notice

Device documentation is solely authoritative

The values may be shortened extracts from the respective documentation, which is decisive and recommended for detailed analysis.

All devices feature:

If applicable, the following functions are still available

Notice

Measurement uncertainty in TC measurement

The measurement uncertainty in the table is only a rough orientating value, since it depends strongly on the TC type and the measuring temperature; details in the respective documentation.

For a possibly more up-to-date overview, please consult www.beckhoff.com.

 

Design

Number of TC
channels

Connection technology

Resolution

Maximum sampling rate per channel for control

KL3311, KL3312, KL3314

K-bus terminal IP20

1-4

Cage Clamp

0.1 °C

4 sps

EL3311, EL3312, EL3314, EL3318

EtherCAT terminal IP20

1-8

Cage Clamp

0.1/0.01 °C

50 sps

EL3314-0090

EtherCAT terminal IP20

4

Cage Clamp

0.1/0.01 °C

50 sps

EL3314-0010

EtherCAT terminal IP20

4

Cage Clamp

0.1/0.01/0.001 °C

50 sps

EL3314-0002

EtherCAT terminal IP20

4

Cage Clamp

0.1/0.01/0.001 °C

200 sps

ELM3344, ELM3348

EtherCAT terminal IP20

2/4

Push-In

0.1/0.01/0.001 °C

1,000 sps

ELM3344-0003, ELM3348-0003

EtherCAT terminal IP20

2/4

Mini-TC

0.1/0.01/0.001 °C

1,000 sps

ELM3702-xxxx, ELM3704-xxxx

EtherCAT terminal IP20

2/4

Push-In, LEMO

0.1/0.01/0.001 °C

10,000 sps

EP3314-0002

EtherCAT Box IP67

4

M8

0.1/0.01 °C

50 sps

EPP3314-0002

EtherCAT P Box IP67

4

M12

0.1/0.01 °C

50 sps

EJ3318

EtherCAT plug-in module

8

On application-specific signal distribution boards

0.1 °C/ digit

25 Sps

Continuation:

 

Measurement uncertainty of temperature measurement incl.
internal cold junction

Measuring ranges - mV measurement

Oversampling

Operation with
external cold
junction is possible

Distributed Clocks for
timestamp operation

KL3311, KL3312, KL3314

< ±0.5 %

30/60/120 mV

-

-

-

EL3311, EL3312, EL3314, EL3318

< ±0.3 %

30/75 mV

-

X

-

EL3314-0090

< ±0.3 %

30/75 mV

-

X

-

EL3314-0010

< ±0.2 %

78 mV

-

X

-

EL3314-0002

< ±0.2 %

78 mV / 2.5 V

-

X

-

ELM3344, ELM3348

< ±0.1 %

20 mV to 10 V

X

X

X

ELM3344-0003, ELM3348-0003

< ±0.05 %

20 mV to 10 V

X

X

X

ELM3702-xxxx, ELM3704-xxxx

< ±0.1 %

20 mV to 10 V

X

X

X

EP3314-0002

< ±0.3 %

30/60/75 mV

-

X

-

EPP3314-0002

< ±0.3 %

30/60/75 mV

-

X

-

EJ3318

< ±0.3 %

30//6075 mV

-

X

-

Continuation:

 

Electrically isolated
channels

TwinSAFE SC

Measured value
filtering

Extended
diagnosis

Special features

KL3311, KL3312, KL3314

-

-

-

-

-

EL3311, EL3312, EL3314, EL3318

-

-

Various predefined internal digital filters

-

-

EL3314-0090

-

X

Various predefined internal digital filters

-

TSC variant of the EL3314-0000

EL3314-0010

-

-

Various predefined internal digital filters

-

Calibrated version EL3314-0030 available

EL3314-0002

Yes, 2500 V functional
isolation

-

Various predefined internal digital filters

-

-

ELM3344, ELM3348

-

-

Various predefined internal digital filters

Freely parameterizable with TwinCAT Filter Designer

Yes, with
CommonMode
measurement

-

ELM3344-0003, ELM3348-0003

-

-

Various predefined internal digital filters

Freely parameterizable with TwinCAT Filter Designer

Yes, with
CommonMode
measurement

-

ELM3702-xxxx, ELM3704-xxxx

-

-

Various predefined internal digital filters

Freely parameterizable with TwinCAT Filter Designer

Yes

Multi-function terminal

EP3314-0002

-

-

Various predefined internal digital filters

-

-

EPP3314-0002

-

-

Various predefined internal digital filters

-

-

EJ3318

-

-

Various predefined internal digital filters

-

-