Siemens S5-135U/155U appendix Using the RAM Submodule with Battery Backup

Models: S5-135U/155U

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CPUs, Memory Cards, Memory Submodules, Interface Submodules

Using the RAM Submodule with Battery Backup

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Proceed as follows to replace the submodule battery:

Step

Action

 

 

1Open the upper side of the cover by releasing the snap-on catch.

2Slacken the screws on the left and right of the battery.

3Replace the submodule battery and secure the new battery with screws, observing the polarity.

4Close the cover again.

Caution

EPROM-battery-backed RAM submodules must not be programmed via the EPROM interface of the PG, otherwise they can be destroyed.

Before inserting or removing the RAM submodule into or out of the CPU, switch the PLC power supply off: this is to ensure that data of the RAM submodule are not corrupted.

Inserting

Unprogrammed

Memory

Submodules

Initial situation:

SThe CPU is in the programmable controller.

SThe power supply of the PLC is switched off.

SThe mode switch of the CPU is at STOP.

Step

Action

 

 

1First insert the battery in the RAM submodule.

2Insert the RAM submodule in the CPU.

3Switch the power supply of the programmable controller on.

4Carry out an overall reset.

5Connect your programmer (PG) to the CPU.

6When the user program has been loaded into the RAM submodule, reset the CPU.

5-88

System Manual

C79000-G8576-C199-06

Page 228
Image 228
Siemens S5-135U/155U Using the RAM Submodule with Battery Backup, Proceed as follows to replace the submodule battery