Alarm
Applications/Failover Option
A-4
SIMATIC PCS 7 OSx 4.0.0 Hardware (PA RISC)
A.2 Application 1: Single Alarm
Figure
A-1
shows a typical single-alarm application using one alarm
annunciator
. Use this application in a multiple-station configuration to
provide a separate alarm from each OSx station. This configuration
provides one critical alarm level.
Output
Channel
#1
Output
Channel #2
24 V
AC or VDC
120 V
AC
Power
Supply
Power
Supply
Manual
Silence
(NC)
Relay
Annunciator
Q0.5
2L
Q0.4
2L
Q0.3
S7–200 CPU 212
Figure A-1 Single
Alar
m
Use the Output Channel #1 for the alarm annunciator silence switch and
Output Channel #2 for the critical alarm annunciator
. The numbers for each
of the outputs are the S7–200 outputs.
Y
ou need two external power supplies (a 24 V
AC or 24 VDC and a 120 V
AC)
for this application. Use a 120 V
AC power supply to drive the alarm
annunciator and a 24 V
AC or 24 VDC power supply for the alarm
acknowledge circuit.
T
o run this application, you need to make the following configuration
changes in the Event Preferences Configuration dialog box. Set the External
Alarm Annunciator
to
Enabled
, and ensure that the alarm output mode is
set to
Pulsed Critical,
which is the default configuration. For instructions on
configuring the alarm output mode, refer to the section on Event
Preferences Configuration in the chapter on configuring OSx stations in the
SIMA
TIC PCS 7 OSx System Administration Manual.
General
Description
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