Central Controllers and Expansion Units Power Supply Units

Starting up with a Lithium Battery

When do you Require a Lithium Battery?

Whether or not you require a lithium battery depends on what type of backup you require for your system. The following table will help you to decide.

IF...

You require long backup times and do not want to supply an external backup voltage,

You require redundant backup and do not want to supply an external backup voltage,

Short backup times are sufficient,

You do not require redundant backup,

THEN...

you need a lithium battery.

you need a lithium battery.

you do not need a lithium battery.

you do not need a lithium battery.

The lithium battery must be ordered separately (see Ordering Information).

Notes Relating to The backup battery (type C) contains lithium (more than 0.5 g) and is

the Lithium Battery delivered separately from the power supply unit, because of special shipping regulations.

Depending on the manufacturer, the battery's plus pole may have a protective cover. You must remove this cover before you place the battery in the battery compartment.

!

How to Fit the Lithium Battery

Caution

Improper replacement of the battery can result in the danger of explosion.

If should only be replaced by the same type or an equivalent one recommended by the manufacturer. Used batteries should be disposed of according to the manufacturer's instructions.

The backup battery must be fitted before the programmable controller is started up. Without a backup voltage, the PLC will remain in the Stop state after system voltage is switched on.

Only use battery compartments marked -A1155-B21 (red label).

Fit the lithium battery in the following steps:

Step

Action

 

 

1Slide the battery compartment cover (A) downwards.

2Pull the battery compartment (B) out.

3Insert the lithium battery in the battery compartment. Important: Ensure correct polarity.

4Slide the battery compartment in.

5Close the cover.

System Manual

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C79000-G8576-C199-06

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Image 97
Siemens S5-135U/155U appendix How to Fit the Lithium Battery