GE P444 User Manual

P44x/EN SC/H
b6
SCADA Communications
(SC) 12
-30 MiCOM P40 Agile
P442, P444
3.7 Setting changes
The relay settings can be split into two categories:
• Control and support settings
• Disturbance record settings and protection setting groups
Changes to settings within the control and support area are executed immediately. Changes
to the protection setting groups or the disturbance recorder settings are stored in a
temporary ‘scratchpad’ area and must be confirmed before they are implemented. All the
relay settings are 4xxxx page addresses. The following points should be noted when
changing settings:
• Settings implemented using multiple registers must be written to using a multi-register
write operation.
• The first address for a multi-register write must be a valid address, if there are
unmapped addresses within the range being written to then the data associated with
these addresses will be discarded.
• If a write operation is performed with values that are out of range then the illegal data
response will be produced. Valid setting values within the same write operation will be
executed.
• If a write operation is performed attempting to change registers that require a higher
level of password access than is currently enabled then all setting changes in the write
operation will be discarded.
3.7.1 Password protection
As described in the introduction to this service manual, the relay settings can be subject to
password protection. The level of password protection required to change a setting is
indicated in the relay setting database. Level 2 or 3 (relays with cyber security features) is
the highest level of password access, level 0 indicates that no password is required.
The following registers are available to control password protection:
a) Models without Cyber Security
40001 & 40002 Password entry
40022 Default password level
40023 & 40024 Setting to change password level 1
40025 & 40026 Setting to change password level 2
30010 Can be read to indicate current access level
b) Models with Cyber Security
420008 - 420011 Setting to change password level 1
420016 - 420019 Setting to change password level 2
420024 - 420027 Setting to change password level 1
3.7.2 Control and support settings
Control and support settings are executed immediately on the write operation.
3.7.3 Protection and disturbance recorder settings
Setting changes to either of these areas are stored in a scratchpad area and will not be used
by the relay unless a confirm or an abort operation is performed. Register 40405 can be
used either to confirm or abort the setting changes within the scratchpad area. The relay
supports four groups of protection settings. The MODBUS addresses for each of the four
groups are repeated within the following address ranges:
Group 1 41000 - 42999
Group 2 43000 - 44999

GE P444 Specifications

General

Brand	GE
Model	P444
Category	Protection Device
Language	English