Operation manual Profibus PBD 100
23.07.2007
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5.4
Redundant bus connection
PROFIBUS PBD 100 devices can be connected with a second (redundant) PROFIBUS cable. If the bus on channel 1 fails, e. g. through
cable break, the slave automatically switches to channel 2. Connect redundant bus cable to channel 2 (optional 2. plug connector )
according to connection diagram (same as channel 1, figure B). The setting of the redundant bus connection is realised via the parameters 4
and 5
5.5
Bus cables
Only cables according to standards DIN 19245 or EN 50170-2, cable type A, may be used for PROFIBUS-DP wiring. A maximum of up to 32
PROFIBUS stations may be connected in one segment. If more stations are to be connected to one PROFIBUS, 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 individual stations on the
PROFIBUS.
Transmission rate in kBit/s
<=93.75
187.5
500
1500
Maximum segment length in m
1200 1000 400 200
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 meter
Cable diameter: 0.64 mm
Core diameter: 0.34 mm², corresponds to AWG 22
Loop resistance: 110 Ohm per km
Screening: CU shielding braid or shielding braid and shielding foil
5.6
Setting of the bus address
The bus address is set on the PROFIBUS-DP board. Loosen screws of PBD 100 case and remove cover. Only addresses from 0 to 125 may
be set. Set the required address with rotary switches (S2) and (S3) (figure C). Switch (S2) for setting the units digit. Switch (S3) for setting
the tens digit. Example:
Figure C: PROFIBUS PBD 100 BOARD
The address ‘65’ is set as follows: (S3) on position 5 (5 * 1 = 5)
(S2) on position 6 (6 * 10 = 60)
Haselhofer
Profibus PBD 100
