Electrical installation
42/14-39 EN
Sensyflow iG, Version 1.00
19
5.5 PROFIBUS bus terminator and cable
To minimize line reflections and to ensure a defined steady level on the transmission line, the transmis-
sion line must be fitted with the following termination resistor combination at both ends.
5.5.1
PROFIBUS DP bus terminator
Fig. 5-4 PROFIBUS DP bus terminator
The number in parenthesis correspond to the pin assignment at the 9-pole D-Sub connector.
5.5.2
PROFIBUS cable DP
The cables for the PROFIBUS connection must comply with the following parameters according to PRO-
FIBUS Specification EN50170 part 8-2:
Note
For safe functioning or to minimize line reflections and to establish a defined steady level, the PROFIBUS
network must be terminated (see PROFIBUS Termination Specification according to EN50170 Volume).
Stub lines should be avoided, as they may cause line reflections and malfunctions.
Note
To ensure safe operation of the PROFIBUS communication you must take the PROFIBUS DP/FMS gui-
deline/installation into consideration.
5.6 Cable connection between sensor and evaluation electronics (remote version)
With the remote version you can use cables with a length up to 25 m between sensor and evaluation elec-
tronics. The connection is made via 10-pole, numbered terminal blocks that can be accessed after remo-
ving the covers at the sensor connection housing and the terminal box of the electronics unit. The
individual wires are wired 1:1 to the 10-pole terminal blocks in the sensor connection housing and at the
terminal box.
You can use a round data cable LIYCY 10
×
0.5 mm² with braided copper shield.
Note
Ready-made cables can be ordered in lengths of 5, 15, and 25 m as accessories (see data sheet).
Parameter
DP, line type A, shielded
Surge impedance in
Ω
135...165 at a frequency of 3...20 MHz
Operating capacitance (pF/m)
30
Loop impedance (
Ω
/km)
≤
110
Solid wire
AWG 22/1
Stranded wire
> 0.32 mm²
390 ohms
220 ohms
390 ohms
VP (6)
Line type B (3)
Line type A (8)
DGND (5)