Manual

Accessories (overview)
Communication modules
PROFIBUS
9

380
EDS94SPP101 EN 7.1
Wiring of the PROFIBUS
 Observe the notes and wiring regulations given in the documentation for the
control system.
ƒ Install a bus terminating resistor only at the first and last physical bus station.
– The bus terminating resistor is integrated into the bus connector and can be
activated via a switch.
– The bus terminator is fed by the bus station. When the communication module is
provided with an external power supply, ( 379) the bus terminator can be fed
independently from the power supply of the standard device.
ƒ Check/activate the bus terminating resistors.
ƒ Use the bus connector to connect the PROFIBUS with the controller.
ƒ Only use cables which correspond to the listed specifications ( 381).
 Note!
ƒ The bus terminator must always be supplied. Otherwise, the bus can get
unstable.
ƒ If you want to disconnect individual bus stations, ensure that the bus
terminators at the first and last physical bus station remain active.
ƒ The bus terminator is no longer active if
– the connector has been pulled out e.g. in the event of service.
– the module supply has been switched off.
 For further notes on the PROFIBUS network, please refer to the PROFIBUS
Communication Manual.