Siemens SIMATIC ET 200M Manual page 154

IM 153-2: 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.
IM 153-2 FO: Removing the Fiber-Optic Cable
If you remove the fiber-optic cable from the IM 153-2 FO, all the following DP
slaves will also no longer be accessible to the DP master.
Caution
!
Do not look directly into the opening of the optical sender diodes.
The light beam could damage your eyes.
Distributed I/O Device ET 200M
EWA-4NEB780600602-06
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Maintenance
7-5