Lenze E84AYCPM - Manual (Page 25)

5 Installation
5.2 Electrical installation
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Lenze · E84AYCPM communication module (PROFIBUS®) · Communication Manual · DMS 5.0 EN · 11/2012 · TD17
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5.2 Electrical installation
5.2.1 Network topology
The following examples show two simple RS485 networks.
Every segment of the network must be terminated at both ends. The bus terminators of the
PROFIBUS are marked with a "Z" in the below examples.
In the case of an RS485 network of only one segment, the PROFIBUS master (M) with the integrated
bus terminator starts the segment while the bus terminating resistor in the connector of the last
PROFIBUS station (S) must be activated.
[5-4] RS485 network with one segment
An RS485 network consisting of several segments contains repeaters (R) for coupling the segments.
The repeaters are provided with integrated bus terminating resistors.
[5-5] RS485 network with a repeater
If no repeater is to be used at the end of the segment, the bus terminating resistor must be activated
in the connector of the last device. The bus termination is supplied by the station itself.

Documentation for the standard device, control system, plant/machine
Observe the notes and wiring instructions given in the documentation.
E94YCPM012a
M
Z
Z
S S S
1
E94YCPM012b
M
Z
Z
S S S
Z Z Z Z
1 2 3
R
S S
R

Stop!
The bus terminator must always be supplied. Otherwise, the bus can get unstable.