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Technical Description
2.3
Power Supply Modules
Power supply modules generate the operational voltages for the PLC from the 120/230 V AC or
24 V DC mains supply and they provide backup for the RAM with a battery or an external power
supply.
Power supply modules also execute monitoring and signalling functions.
You can set the following switches on the PS 951 power supply module:
•
The Voltage Selector switch sets the line voltage at either 120 V AC or 230 V AC for AC
modules. The PS 951 can also be operated with a 24 V DC power supply.
•
The ON/OFF switch turns the operating voltages on or off.
•
The RESET switch acknowledges a battery failure indication.
SIEMENS
SIMATIC S5
PS
Batt.
3.4V/5Ah
Replace by
trained
personnel
only!
+
-
EXT BATT 3.4V
BATT LOW
RESET
5V DC
5.2V DC
24V DC
INT DC
POWER
VOLTAGE
SELECTOR
L1
N
120/220V
2-6
Battery compartment
Sockets for external 3, 4 to 9 V DC for backup (when
battery is changed and power supply is shut off)
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 dropped below 2.8 V.
If the LED lights up, the "BAU" signal is sent to the
CPU.
RESET switch
Use this switch to acknowledge a battery failure signal
after you have installed a new battery. If you are
operating the PS 951 power supply module without a
battery, activate this switch to suppress the "BAU"
signal.
Operating voltage displays
•
+5 V
•
+5.2 V
•
+24 V
ON/OFF switch (I=ON, 0=OFF)
When the switch is in the "OFF" position, the opera-
ting voltages are disabled without interrupting the
connected line voltage.
120 V AC/230 V AC Voltage Selector switch with trans-
parent cover.
Screw-type terminals for connecting the line voltage
Figure 2-3. Power Supply Module Control Panel
supply voltage for the input/output mo-
dules
supply voltage for PG 605U, OPs, BT 777
bus terminal
for serial interface (20 mA current loop in-
terface).
EWA 4NEB 811 6130-02b
S5-115U Manual
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