Maintenance
7-3
Distributed I/O Device ET 200M
EWA-4NEB780600602-06
7.2 Replacing the IM 153-1
Initial Situation
The IM 153-1 is installed. You want to install a new IM 153-1 of the same type.
Slot Numbering
If you have given slot numbers to the modules in your system, you must remove
the numbering from the old module when you replace the module and use it on the
new module.
Unplugging the Bus Connector
With a looped-through interconnecting cable you can unplug the bus connector
from the PROFIBUS-DP interface without interrupting data traffic on the network.
Note
A data communication error may occur on the network.
A network segment must always be terminated at both ends with the terminating
resistor. This is not the case, for example, if the power supply is not activated on
the last slave with a bus connector. The efficacy of the terminating resistor is
impaired because the terminating resistor in the bus connector gets its voltage
from the node.
Please make sure that power is always supplied to nodes
on which the terminating resistor is active.
Tip: You can use the PROFIBUS terminator as an active bus terminating element.
Removing a Module
To remove the module, proceed as follows:
1. Put the on/off switch of the power supply module in the 0 position ( :output
voltage 0 V).
2. Remove the bus connector.
3. Disconnect the wiring.
4. Remove the fixing screws of the IM 153-1.
5. Swing the IM 153-1 out.
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