Write Protection

General Description

WARNING
HAZARD OF NUISANCE TRIPPING OR FAILURE TO TRIP Protection setting adjustments must be done by qualified electrical personnel. Failure to follow these instructions can result in death, serious injury, or equipment damage.

Remote modifications of Modbus registers can either be dangerous to personnel near the circuit breaker or can cause equipment damage if the protection settings are altered. Therefore, remote control commands are hardware protected (refer to Modbus Locking Pad) and software protected.

Software Protection

To prevent an inadvertent change to the ETV trip system configuration, remote modifications of the Modbus registers are protected by both of the following settings:

• a robust data structure and a set of dedicated Modbus registers

• a user profile password scheme

This combination is called the command interface. Failure to conform to these settings results in an error code and the operation is not performed. The hardware protection has always precedence over the software protection.