3WL air circuit breakers
3.5 External CubicleBUS modules
3WL/3VL circuit breakers with communication capability - PROFIBUS
System Manual, 03/2011, A5E01051353-02
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3.5.2 Digital input module
Up to two digital input modules can be operated simultaneously on a CubicleBUS, once as a
module with the position "PROFIBUS INPUT" and once as a "PARAMETER SWITCH". The
polarity of the inputs is not important.
Input module function
The digital input module offers connections for up to six additional binary signals (24 V DC).
The signals are transferred direct via PROFIBUS DP and processed at the fieldbus level.
Such signals include:
● The status of a Buchholz relay
● The open/closed signal of the control cabinet door
● Violation of a specified temperature
● The status of an MCCB without direct communications capability or of a switch
disconnector can also be transferred on PROFIBUS DP.
These protective devices can also be switched in conjunction with the configurable output
module, resulting in a low-cost alternative to other solutions with additional PROFIBUS DP
input/output modules.
Switch position "PROFIBUS INPUT"
In switch position "PROFIBUS INPUT", a total of six inputs are available.
Switch position "PARAMETER SWITCH"
If the rotary coding switch is in position "PARAMETER SWITCH", there are also six inputs
available, but in this configuration the first input has the effect of changing the active
parameter set. If the connected ETU does not have two parameter sets (e.g. ETU45B), this
input can also be used without restriction.
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