Bus Cables - AUMA AUMATIC AC 01.1 Short Instructions

Short instructions
3.5.3

Bus cables

Figure E: Example: Profibus with one segment
2-wire cable
Profibus DP board
Connection
board
AUMATIC
Profibus DP
Only cables according to standard DIN 19245 or EN 50170-2, cable type A,
may be used for Profibus DP wiring.
A maximum of up to 32 Profibus devices may be connected in one segment.
If more devices are to be connected to one Profibus network, several
segments must be connected with repeaters.
The bus cable must be laid at a distance of at least 20 cm from other cables.
It should be laid in a separate, conductive and earthed cable trunking.
It must be ensured that there are no potential differences between the indi-
vidual devices on the Profibus (Perform a potential compensation).
Table 5
Transmission speed
in kBit/s
Maximum segment length
in m
Cable specification cable type A for Profibus DP
Impedance: 135 to 165 Ohm, at a frequency
of 3 to 20 MHz.
Cable capacity: < 30 pF per metre
Cable diameter > 0.64mm
Cross section: > 0.34 mm², corresponds to AWG 22
Loop resistance: 110 Ohm per km
Screening: CU shielding braid or shielding braid and
shielding foil
Actuator controls AUMATIC AC 01.1 / ACExC 01.1
≤ 93,75
1200
Controls (master)
Bus termination
switched on
Bus termination
switched on
Profibus DP
187.5 500 1500
1000 400 200
9