Siemens siprotec 7SA522 User Manual page 411

Binary Outputs
Front Panel
PC–Interfaces
7SA522 Manual
C53000-G1176-C119-2
LEDs that display a condition should light for as long as the condition is maintained.
The LED action is therefore generally not latched. Of course, these LEDs are also in-
cluded in the function check with the LED key
Indications can be configured to output relays for external indication (e.g. annunciator,
sequence-of-events recorder, RTU, etc), and operate like LEDs. See also Chapter 5
for details.
To retrieve messages using the front panel:
First press the 0(18 key
FLDWLRQ) is marked.
All menus and message lists begin with a title. The number in the upper right corner
of the display indicates presently selected menu entry or message, and, behind the
slash, the total number of menu entries or messages (see Figure 7-1, each first line).
key to go to the $1181&,$7,21 sub-menu, as shown in Figure 7-1. In
Press the
this menu the messages can be reached by entering the associated selection number,
or by selecting the desired entry using the
key. This procedure is described in more detail below.
0$,1 0(18

!$QQXQFLDWLRQ
0HDVXUHPHQW
Selection of messages on the
Figure 7-1
A personal computer running the program can be connected to the operating interface
on the front of the device to retrieve the messages. A PC can also be connected to the
service interface on the back of the device. This connection typically applies when the
PC is hard-wired with several devices, using a data bus (station computer) or modem.
Details about the operation of are contained in the " Device Operation" handbook, or-
der no. E50417-H1176-C097.
LED
. The 0$,1 0(18 appears. The first menu item $QQXQ
MENU
and

²! 
²! 
operator control panel
Control During Operation
.
keys and moving further with the
$1181&,$7,21 

!(YHQW /RJ ²!
7ULS /RJ ²!


7-3