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Installing 505 System Hardware SIMATIC 545/555/575 System Manual

Replacing and Handling the Battery (continued)

The 545–1103/1104 and 555–1103/1104 CPUs use a lithium coin battery for

maintaining CPU memory contents while power is not present. The battery

is a Panasonic BR2325, PPX:2587678–8010, or equivalent, 23 mm diameter,

with a nominal capacity of 165 mAh. The lithium battery is a primary cell;

it is not rechargeable. Figure 3-11 shows the location of the battery on the

CPU card.

EEPROM

Replaceable

Lithium Battery

Battery Clip

Battery Socket

Figure 3-11 Battery Location on 545/555 CPU Modules

A fresh battery can typically maintain your system with power off for three

months at room temperature, or a substantially shorter time at elevated

temperatures. The battery indicator is illuminated as long as power is

present and the battery voltage is adequate for maintaining the memory;

however, the indicator does not show the amount of battery life remaining.

When the battery indicator blinks or goes off, the battery has dropped below

the voltage required to maintain memory and should be replaced. See page

3-20, “Replacing the Battery.”

WARNING

Charging a primary lithium battery can cause the battery to explode.

An exploding lithium battery can result in death or serious injury to personnel,

and/or damage to equipment.

Do not attempt to charge primary lithium batteries. Instead, replace your battery

following the procedure on page 3-20, and dispose of the battery according to

the instructions of its manufacturer.

Lithium Battery in

the 545 and 555

–1103/–1104 CPUs

Indicators

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Siemens SIMATIC TI500 Spezifikationen Seite 73