3WL air circuit breakers
3.2 COM15 module and BSS module
3WL/3VL circuit breakers with communication capability - PROFIBUS
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System Manual, 03/2011, A5E01051353-02
3.2.4
PROFIBUS write protection (DPWriteEnable)
In applications in power distribution, it is necessary to disable write access via PROFIBUS
temporarily or permanently. There is a hardware input on the COM15 for this purpose. Pin1
provides the 24 V DC supply that can be run back via a contact to Pin 2 (DPWriteEnable), for
example.
If this input is not bridged (that is, actively enabled), write access is not possible (with
exceptions).
Without a bridge at the input of the write protection, the following actions will be disabled:
●
Switching on or off
●
Resetting the current tripping operation
●
Changing the protection parameters
●
Changing the parameters for the extended protection function (metering function)
●
Changing the parameters for communication
●
Changing the parameters for measured value setting (metering function)
●
Resetting maintenance information (counter)
●
"Forcing" the digital outputs (in the "Operate Modules" window of Switch ES Power)
●
Transfer DPV1 startup parameters from the object manager of Switch ES Power
The following actions are still permitted in write-protect mode:
●
Modifying and setting of trigger functions for the waveform buffer
●
Reading out the contents of the waveform buffer
●
Changing the parameters for threshold values
●
Setting/modifying the system time
●
Modifying the free texts (comment, plant identifier)
●
Resetting the min./max. values
●
Modifying the free user output
Transfer of necessary information
Despite the write protection, all the necessary information can be transferred, but the status
of the circuit breaker cannot be changed.
This is reserved for the operator of the power distribution system. All non-disabled actions
are used only for remote diagnostics and do not affect the current status. However, it is
possible to diagnose tripping operations and waveforms more precisely, even remotely.
3.2.5
Data exchange via the COM15
When configuring the COM15 for data exchange, you must note that the COM15 is supplied
as standard with the PROFIBUS DP address 126. This must be changed by the user when
configuring the system (e.g. with display of the ETU76B).