Beckhoff EL3681 Documentation page 132

Commissioning
Fig. 140: Connection of externally supplied sensors
Classification of Beckhoff Terminals/ Box modules - Beckhoff 0/4-20 mA Terminals/ Box modules (and
related product groups) are available as differential and single-ended:
Single-ended
EL3x4x: 0-20 mA, EL3x5x: 4-20 mA, same as KL and related
product groups
Preferred current direction because of internal diode
Designed for the connection of externally-supplied sensors with a
3/4-wire connection.
Designed for the connection of self-supplied sensors with a 2-
wire connection
132
Differential
EL3x1x: 0-20 mA, EL3x2x: 4-20 mA, same as KL and related
product groups
Preferred current direction because of internal diode
The terminal/box is a passive differential current measuring
device; passive means that the sensor is not supplied with
power.
Version: 3.0 EL3681