Description
2.8 Communication and system connection
3WA1 air circuit breaker
164 Equipment Manual, 02/2023, 92310000002-06
Parameter write protection
The parameter write protection is implemented via a slide switch on the communications
module. It prevents unwanted changes to circuit breaker parameters via the fieldbus
interfaces of the communications module.
The parameter write protection is an effective way to protect the circuit breaker against
unwanted changes, e.g. after installation.
The slide switch for parameter write protection is marked with two icons:
•
Parameter write protection is activated
•
Parameter write protection is deactivated
When parameter write protection is active, changes to parameters such as protection
parameters, communication parameters or device parameters via the PROFINET,
Modbus TCP or Modbus RTU communications interfaces are not accepted with a few
exceptions.
protection is activated by default. To change parameters via the
communications interfaces, parameter write protection must be deactivated.
Parameter write protection has no effect on the circuit breaker's USB and Bluetooth
interfaces.
Blocked changes and actions
The following changes and actions are blocked when parameter write protection is
active:
• Resetting the current tripping operation
• Changing the protection parameters
• Changing the parameters for the enhanced protective function
• Changing the parameters for communication
• Changing the parameters for the metering value setting/metering function
• Resetting of maintenance information (counter)
• Control of digital outputs
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