Setting Restriction Of Hmi (Srh); Application; Functionality - ABB REL 501-C1 2.5 Technical Reference Manual

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Setting restriction of HMI (SRH)

Setting restriction of HMI (SRH)
Note!
The HMI--BLOCKSET functional input must be configured to the selected binary input before
setting the setting restriction function in operation. Carefully read the instructions.

Application

Use the setting restriction function to prevent unauthorized setting changes and to control when
setting changes are allowed. Unpermitted or uncoordinated changes by unauthorized personnel
may influence the security of people and cause severe damage to primary and secondary power
circuits.
By adding a key switch connected to a binary input a simple setting change control circuit can
be built simply allowing only authorized keyholders to make setting changes from the local
HMI.

Functionality

The restriction of setting via the local HMI can be activated from the local HMI only. Activating
the local HMI setting restriction prevent unauthorized changes of the terminal settings or con-
figuration.
The HMI-BLOCKSET functional input can be configured only to one of the available binary
inputs of the terminal. The terminal is delivered with the default configuration HMI--BLOCK-
SET connected to NONE-NOSIGNAL. The configuration can be made from the local HMI
only, see the Installation and comissioning manual.
The function permits remote changes of settings and reconfiguration through the serial commu-
nication ports. The restriction of setting from remote can be activated from the local HMI only.
Refer to section 1.4.3 "Setting parameters"
All other functions of the local human-machine communication remain intact. This means that
an operator can read disturbance reports, setting values, the configuration of different logic cir-
cuits and other available information.
for SPA communication parameters.
Chapter 3
Common functions