What you should know about analog technology
2.20 Burden with 2-wire transducers
Analog value processing
Function Manual, 06/2014, A5E03461439-AC
57
Burden with 2-wire transducers
2-wire transducers
2-wire transducers are current transducers which convert the process variable into a current
signal of between 4 and 20 mA. Two connection lines supply the transducer with an output
current of at least 4 mA. Additional information on connecting 2-wire transducers to analog
input modules can be found in the section Wiring current transducers (Page 72).
The burden indicates how great the external resistance in a current loop may be. If the
external resistance is greater than the specified burden, the 2-wire transducer supply voltage
is too low. The burden consists of the resistance of the transducer and all other resistances
connected to the current loop.
The maximum admissible burden of the transducer, e.g. 820 Ω, is specified in the technical
data of the analog module.
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