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

3.9 Replacing and Handling the Battery

The 545–1105/1106 and 555–1105/1106 CPUs use a lithium battery for

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

battery is a primary cell; it is not rechargeable. The battery in these CPU

models is accessible through the bezel door on the front of the module, as

shown in Figure 3-9.

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

the voltage required to maintain memory and should be replaced. Request

battery kit replacement part number PPX:2587678-8005 for the appropriate

replacement battery. Refer to page 3-19 for guidelines on handling batteries.

NOTE: As a good engineering practice, design your user program to monitor

Status Word 01 on a cyclic basis and trigger an alarm if the battery-low bit

(15) is set. Additionally, you can use the battery life specifications listed in

Table A-2 to determine how often you routinely replace the battery.

Replaceable Lithium Battery

Figure 3-9 Battery Location in –1105 and –1106 CPU Modules

Lithium Battery in

the 545 and 555

–1105/–1106 CPUs

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Siemens SIMATIC TI500 Spezifikationen Seite 71