7SR11 & 7SR12 Description Of Operation
©2012 Siemens Protection Devices Limited Chapter 1 Page 75 of 76
6.5 Operating Mode
The relay has three operating modes, Local, Remote and Out of Service. The following table identifies the
functions operation in each mode.
The modes can be selected by the following methods:
SYSTEM CONFIG>OPERATING MODE setting, a Binary Input or Command
Table 4-1 Operating Mode
OPERATION REMOTE MODE LOCAL MODE SERVICE MODE
Control
Rear Ports Enabled Disabled Disabled
Fascia (Control Mode) Disabled Enabled Disabled
USB Disabled Enabled Disabled
Binary Inputs Setting Option Setting Option Enabled
Binary Outputs Enabled Enabled Disabled
Reporting
Spontaneous
IEC Enabled Enabled Disabled
DNP Enabled Enabled Disabled
General Interrogation
IEC Enabled Enabled Disabled
DNP Enabled Enabled Disabled
MODBUS Enabled Enabled Disabled
Changing of Settings
Rear Ports Enabled Disabled Enabled
Fascia Enabled Enabled Enabled
USB Disabled Enabled Enabled
Historical Information
Waveform Records Enabled Enabled Enabled
Event Records Enabled Enabled Enabled
Fault Information Enabled Enabled Enabled
Setting Information Enabled Enabled Enabled
6.6 Control Mode
This mode provides convenient access to commonly used relay control and test functions. When any of the items
listed in the control menu are selected control is initiated by pressing the ENTER key. The user is prompted to
confirm the action, again by pressing the ENTER key, before the command is executed.
Note that a CB must be in a Closed state before an Open command will be accepted. And that a CB must be in
an Open state before a Close command will be accepted. If not, the Relay reports that the requested command is
‘Interlocked’.
Note also that switching a protection function IN / OUT via the Control Menu will not change that function’s
ENABLED / DISABLED setting. The Control Menu selection will over-ride the setting, however.
Control Mode commands are password protected using the Control Password function – see Section 6.9.
6.7 Real Time Clock
Time and date can be set either via the relay fascia using appropriate commands in the System Config menu or
via the data comms channel(s). Time and date are maintained while the relay is de-energised by a back up
storage capacitor. The length of time for which this data will be maintained will depend on such things as
temperature, length of time in service, etc. However the data will be maintained for a minimum of 1.8 days.
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