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Installing 505 System Hardware SIMATIC 545/555/575 System Manual
3.10 Setting the CPU Dipswitches
Dipswitches
are used to set 545/555 CPU operating parameters. The
dipswitches are located near the front of the CPU, behind the bezel or
battery door
. See Figure 3-12. T
o gain access, lower the access door
. W
ith the
CPU in its (normal) vertical position, dipswitches pushed to the left are On;
dipswitches pushed to the right are Off.
Dipswitch
Port
2 = RS-485* Port 2 = RS-232/422
Port 1 = Programming port
Port 1 = Printer port
Port 1
Baud rate
Port 2
Baud rate
Battery Of
f
Battery On
Not used
0
(Of
f)1
*
For the 545–1
103, port 2 is an RS-232 port only
.
(On)
Figure 3-12 545/555
CPU Dipswitch Location
SW9 is used to set the back-up battery On or Off. As Figure 3-12 indicates,
moving the switch to the left enables the back-up battery; setting the switch
to the right disables the back-up battery
.
NOTE:
When SW9 is set to the On position, the battery LED indicates the
state of the battery back-up circuit. If the battery LED is illuminated,
memory contents should be maintained; if the LED is not illuminated,
memory contents will not be maintained.
Dipswitch Location
and Settings
Enabling Battery
Backup
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