Siemens SIMATIC S5-115F - Page 95

System Startup S5-115F Manual
Power supply module
You can set the following switches on the PS 951 power supply module ( Figure 4-1):
• The ON/OFF switch turns the 5V power on or off.
• The RESET switch acknowledges a battery failure indication.
Battery compartment
Sockets for external DC voltages 3.4 to 9 V for memory
backup during battery change. The battery can be
changed in PLC RUN.
Battery failure indicator
The LED lights up under the following conditions:
• there is no battery
• the battery has been installed incorrectly
• the battery voltage has gone below 2.8 V
If the LED lights up, the ”BAU” signal is sent to the CPU
and the PLC goes to STOP.
RESET switch
Use this switch to acknowledge a battery failure signal
after you have installed a new battery. If you are oper-
ating the PS 951 power supply module without a
battery, activate this switch to suppress the ”BAU” sig-
nal.
Operating voltage display of 5 V for the central control-
ler and expansion units in centralized configurations.
ON/OFF switch (I=ON, O= OFF)
When the switch is in the ”OFF” position, the operating
voltage is disabled without interrupting the connected
line voltage.
Screw-type terminals for connecting the line voltage
a a a a a a a a a a
a
a a a a a a a a
a
a
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a
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SIEMENS
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a
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a
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a
a
a a a a a a a a a a
a
a a a a a a a a a a a a
SIMATIC S5
PS
7A/15A
EXT BATT
3.4...9V
BATT LOW
a a a a a a
a
a a a a
a
a a a a a a
RESET
a a a a a a
a
a a a a
a
a a a a a a
5V DC
a a a a a a a
a
a a a a a
a
a a a a a a a
5.2V DC
a a a a a a a
a
a a a a a
a
a a a a a a a
24V DC
a a a a a a a
a
a a a a a
a
a
a a a a a
a
a
a a a a a
a
a a a a a a a
INT DC
POWER
a a a a
a
a a
a
a a a a
+
a a a
a
a
a
a a a
-
a a a a
a
a a
a
a a a a
L+
a a a
a
a
a
a a a
M
a a a a a a a
a
a a a a a
a
a a a a a a a
24 V DC
a a a a a
a a a a a
a a a a a
a a a a a
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a
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a
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a a a a a a a a a
a
a
a a a a a a a a a
a
a a a a a a a a a a a
BATT1-BATT2
3.4V/2Ah
Replace by
trained
personnel
only!
Figure 4-1. Front View of the Power Supply Module
4-2 EWA 4NEB 811 6148-02