Siemens siprotec 7SA522, User Manual

Page: 449 / 628

Control During Operation
7-41
7SA522 Manual
C53000-G1176-C119-2
Figure 7-47 Selection Window for Manual Overwriting of a Switch Position, Front Panel
A safety inquiry appears: “
$UH\RXVXUH"
” Provided manual overwriting is allowed,
a response of “
<(6
” results in an appropriate message on the display. Acknowledge
the message by pressing the key again.
Manual overwriting is cancelled if the process is restricted because, for example, “
LQ
SXWLJQRUHG
” is not set (see Sub-section 7.4.3). Manual overwriting is also canceled
if the user aborts the procedure. The display provides an appropriate message if man-
ual overwriting is canceled. Acknowledge the message by pressing the
key.
Return to the
%5($.(56:,7&+
sub-menu using the key, or the
0$,10(18
by
pressing the key.
From PC with
DIGSI
®
4
For safety reasons, manual overwriting is only possible locally using the keypad on the
front panel of the device. The feature is not available in DIGSI
®
4.
7.4.3 Set Status
A feature of the 7SA522 that is especially useful during testing and commissioning of
the device is the capability of temporarily removing the coupling between a switching
device and the 7SA522, or between the SCADA and the 7SA522, without physically
disconnecting the equipment. This type of separation is also necessary, for instance,
if a switch position feedback message is not functioning properly (refer to Sub-section
7.4.2). The menu item
6(767$786
is used to perform the decoupling.
The menu displays a list of all planned switching devices and associated status infor-
mation identified by a letter. The letters have the following meanings:
•
T Device is tagged (manually overwritten).
•
I Input ignored, which means the acquisition of an input status is de-coupled from
the process (from the switch-gear).
•
B Blocked, which means data transmissions to the central device (or SCADASCA-
DA) are blocked.
•
C Chatter block active, which means, because of frequent message changes, the
chatter block was set.
•
O Output block active, which means the command output is de-coupled from the
process (from the system).
•
– None of the listed limitations is in effect.
0$12
! 23(1
!%UH&/26 ! 23(1
!'LVF&/26
ENTER
ENTER
MENU
: