28
Setting lockout (HMI)
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Unpermitted or uncoordinated changes by unauthorized personnel may cause severe
damage to primary and secondary power circuits. Use the setting lockout function to
prevent unauthorized setting changes and to control when setting changes are allowed.
By adding a key switch connected to a binary input a simple setting change control cir-
cuit can be built simply allowing only authorized keyholders to make setting changes.
Security can be increased by adding SA/SMS overrides that prevents changes even by
keyholders.
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Activating the setting restriction prevents unauthorized personell to purposely or by
mistake change terminal settings.
The HMI--BLOCKSET functional input is configurable only to one of the available bi-
nary inputs of a REx 5xx terminal. For this reason, the terminal is delivered with the
default configuration, where the HMI--BLOCKSET signal is connected to NONE-
NOSIGNAL.
The function permits remote changes of settings and reconfiguration through the serial
communication ports. The setting restrictions can be activated only from the local HMI.
All other functions of the local human-machine communication remain intact. This
means that an operator can read all disturbance reports and other information and set-
ting values for different protection parameters and the configuration of different logic
circuits.
Summary of Contents for REO 517
Page 10: ... RQWHQWV ...
Page 16: ...6 Introduction to the application manual KDSWHU QWURGXFWLRQ ...
Page 64: ...54 Blocking of signals during test KDSWHU RPPRQ IXQFWLRQV ...
Page 88: ...78 Scheme communication logic ZCOM KDSWHU LQH LPSHGDQFH ...
Page 146: ...136 Unbalance protection for capacitor banks TOCC KDSWHU XUUHQW ...
Page 166: ...156 Dead line detection DLD KDSWHU 3RZHU V VWHP VXSHUYLVLRQ ...
Page 378: ...368 Monitoring of DC analog measurements KDSWHU 0RQLWRULQJ ...
Page 384: ...374 Pulse counter logic PC KDSWHU 0HWHULQJ ...
Page 412: ...402 Serial communication modules SCM KDSWHU DWD FRPPXQLFDWLRQ ...
Page 440: ...430 LED indication module KDSWHU DUGZDUH PRGXOHV ...