
AED
CONNECTING INTERFACES AND I/OS
30
PROFIBUS cable length and bit rate
Bit rate in kBit/s
9.6
19.2
93.75
187.5
500
1500
12000
Max. cable length in m
1200
1200
1200
1000
400
200
100
Master
Node 1
Node X
...
IN
OUT
IN
OUT
IN
OUT
A B
A B
A B
A B
A B
A B
Bus termination
Bus termination
+U
390
Ω
220
Ω
390
Ω
GND
+U
390
Ω
220
Ω
390
Ω
GND
Fig. 7.5
Connecting nodes to the PROFIBUS
Important
The termination resistors may only be activated at the end points of the interface cable. If
resistors are also activated in between, this will weaken the signal and anything from
interference to data transmission failure could result.
7.1.4
Connection to the diagnostic bus
The diagnostic bus is used for analysis during the development of a measuring system,
and for the encrypted exchange of data with digital indicator DWS2103 in a legal-for-
trade configuration.
The bus is a 2-wire bus with RS‐485 (lines TA/RA, TB/RB and GND, also see Fig. 7.2 on
page 27).
The interface settings of the bus are fixed and cannot be changed: 38400 bit/s, 8E1 (8
bits, even parity, 1 stop bit). The factory-set address is 31.
Bus termination resistors are not required for this bus; otherwise the same conditions
apply to connection as for the normal RS-485 interface with 2-wire connection.
All diagnostic bus functions are also available via the PanelX program. See the program's
online Help for more information.
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