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3-21

SIMATIC 545/555/575 System Manual

Installing 505 System Hardware

3. Remove the CPU from the chassis and place the CPU, component-side

up, on a static-dissipative surface.

The components in the CPU card can be degraded or destroyed by

electrostatic discharge (ESD). Follow proper handling precautions in

order to prevent ESD damage.

4. Remove the battery from the socket, observing the following

precautions:

WARNING

The terminals of the lithium coin cell are extremely close together. In the course

of removing the battery, it is possible for you to short the battery.

Shorting the battery presents the danger of explosion and/or high

temperatures, and could cause death or serious injury to personnel, and/or

damage to equipment.

Follow the instructions given below in order to avoid shorting the battery.

• Use a non-conductive implement when removing the battery from

the socket. Do not allow a conductive device (for example, a metal

screwdriver blade) to contact both sides of the battery

simultaneously. Since the battery is shaped like a coin, it is easy

for the screwdriver blade to make contact with both rim and

underside, which would cause a short.

CAUTION

The positive contact of the battery socket is a thin metal strip, easily bent.

If you deform the positive contact of the socket, the socket is ruined.

Extract the battery gently so that you do not overflex the socket. Follow the

instructions given below.

• If you pull the battery straight up from the socket, you could

spring the positive contact and ruin the socket. Instead, lift the

battery up to the height of the socket rim and carefully slide it out,

making certain you do not bend the socket’s positive contact.

5. Slide a fresh battery into the socket, being careful to observe polarity.

The battery and the socket are both marked with plus signs (+),

indicating positive contacts. The positive contact is the upper contact.

6. Reinstall the CPU in the chassis.

7. Ensure the battery is enabled (SW9 is set to On). (See page 3-22.)

8. Restore power to the chassis.

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Siemens SIMATIC TI500 Spezifikationen Seite 76