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Maintenance

7-6

Distributed I/O Device ET 200M

EWA-4NEB780600602-06

In the Case of Redundancy

Note

Only replace the IM 153-2/-2 FO in a de-energized state!

If you carry out a replacement in an energized state, the specified switchover

times cannot be guaranteed and the I/O modules could fail for a certain time and

output “0”.

If you replace the IM 153-2/-2 FO in a redundant configuration, the following

applies:

”ACT” LED is on: ”ACT” LED is off:

The IM 153-2/-2 FO is the active one of the

two IM 153-2/-2 FO modules.

The IM 153-2/-2 FO is the passive one of

the two IM 153-2/-2 FO modules.

You can replace these IM 153-2/-2 FO

modules without the need for switchover

operations in the ET 200M.

Removing a Module

To remove the module, proceed as follows:

1. In the case of redundancy: The IM 153-2/-2 FO to be replaced must be

de-energized! Switch off the associated power supply module or disconnect it

from the IM 153-2/-2 FO.

Warning

If in redundancy mode the two IM 153-2 modules are connected to a power supply

module, a short circuit could occur at the non-insulated (loose) cable ends if the

24 V supply is disconnected from one of the IM 153-2.

If the power supply is short-circuited in this way, the second IM 153-2 and

therefore your ET 200M fail completely.

The greatest care must therefore be taken when disconnecting the supply voltage

and the two cable ends must be insulated until they are connected to the new

IM 153-2.

No redundancy: Put the on/off switch of the power supply module into the 0

position ( : output voltage 0 V).

2. Remove the bus connector or fiber-optic cable.

In the case of fiber-optic cables: Flip open the grip of the plug-in adapter and

remove it from the IM 153-2 FO.

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Siemens SIMATIC Distributed I/O System DP/ASi Link Specifiche Pagina 154