Endress+Hauser PROline promag 53 - Wiring; 4.1 PROFIBUS Cable Specifications

Wiring Promag 53 PROFIBUS DP/PA
46 Endress+Hauser
4 Wiring
#
Warning!
When connecting Ex-certified devices, see the notes and diagrams in the Ex-specific
supplement to this Operating Manual. Please do not hesitate to contact your
Endress+Hauser sales office if you have any questions.
!
Note!
The device does not have an internal power switch. For this reason, assign the device a
switch or power-circuit breaker which can be used to disconnect the power supply line from
the power grid.
4.1 PROFIBUS cable specifications
4.1.1 PROFIBUS DP cable specification
Cable type
Two versions of the bus line are specified in IEC 61158. Cable type A can be used for all
transmission rates up to 12 Mbit/s. Please refer to the table for the cable parameters:
Bus structure
Note the following points:
• The maximum line length (segment length) depends on the transmission rate.
For cable type A, the maximum line length (segment length) is as follows:
• A maximum of 32 users are permitted per segment.
• Each segment is terminated at either end with a terminating resistor.
• The bus length or the number of users can be increased by introducing a repeater.
• The first and last segment can comprise max. 31 devices.
The segments between the repeaters can comprise max. 30 stations.
• The maximum distance between two bus users can be calculated as follows: (NO_REP + 1)
x segment length
!
Note!
NO_REP = maximum number of repeaters that may be switched in series depending on
the repeater in question.
Cable type A
Characteristic impedance 135 to 165  at a measuring frequency of 3 to 20 MHz
Cable capacitance < 30 pF/m
Core cross-section >0.34 mm

, corresponds to AWG 22
Cable type Twisted in pairs, 1 x 2, 2 x 2 or 1 x 4 wire
Loop-resistance 110 /km
Signal damping Max. 9 dB over the entire length of the cable section
Shielding Copper braided shielding or braided shielding and foil shielding
Transmission rate [kBit/s] 9.6 to 93.75 187.5 500 1500 300 to 12000
Line length [m] ([inch]) 1200 (4000) 1000 (3300) 400 (1300) 200(650) 100(330)