Cpu Battery; Setting Cpu Dipswitches; Figure 3-11 Cpu Dipswitch Location - Siemens SIMATIC TI555 System Manual

CPU Battery

! CAUTION
Setting CPU
Dipswitches
TI545/TI555 System Manual
A permanent, rechargeable battery protects user memory and programs
during a power cycle. Battery backup typically lasts six months at
temperatures ranging from 0 to 60 C provided the battery was fully
charged.
If the battery LED does not light, the battery may be discharged. A blinking
LED indicates a marginal charge. The LED lights steadily when the battery
is sufficiently charged with the switch enabled and power applied. The
battery will be only be fully charged following 36 hours of being powered
after the LED first lights steadily.
Because the CPU contains a 3 V lithium battery that is soldered in the CPU
module, the CPU must be sent to the factory to replace the battery. Refer
also to Section 7.2 for more information on the battery LED.
Battery Damage: Do not leave the unit powered down with the
battery switch on for longer than six months.
Doing so could damage the battery to the point it cannot be
recharged.
Return a unit in this condition to the factory for battery
replacement.
Dipswitches are used to set CPU operating parameters. The dipswitches are
located near the front of the CPU behind the bezel door; see Figure 3-11. To
gain access, lower the access door. With the CPU in its (normal) vertical
position, dipswitches pushed to the left are On; dipswitches pushed to the
right are Off.
Dipswitch

Figure 3-11 CPU Dipswitch Location

Port 2 = RS-232/422
Port 1 = Programming port
Battery ON
Installing Series 505 System Hardware
ON OFF
Port 2 = RS-485
Port 1 = Printer port
Port 1
Baud rate
Port 2
Baud rate
Battery OFF
Not used
3-13