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7. Appendix A: Technical Characteristics
Profibus-DP
characteristics
(cont'd)
• Maximum number of stations: 32 stations per segment, repeater included; up to
126 stations with all three repeaters (repeaters included). Address 126 is reserved
and should therefore not be used for exchanging data.
• Possible types of stations: there are three types of Profibus-DP stations:
- Class 1 DP master (DPM1): PLC, PC, etc. exchanging information with DP slaves.
- Class 2 DP master (DPM2): A programming, bus configurating, or commissionning
device, used to configure the Profibus-DP network upon commissioning and operation,
or supervision.
- DP slave: Peripheral device that exchanges data cyclically with “its” active DPM1
station.
• Mono-master or multi-master network.
• Hybrid access method: Acyclical communication between masters using the
transfer of a token (synchronisation); cyclical master/slaves communications
(application data transfers).
• Up to 244 input bytes and 244 output bytes per DP slave; typical exchange of
32 bytes per slave.
• Operating modes: Functional operations (cyclical I/O exchanges), resetting to
zero (input reading and output resetting), or disruption (only inter-master
functions are allowed).
• Input (Freeze-Mode) and/or output (Sync-Mode) synchronisation of all DP
slaves.
• Other services offered:
- Verification of DP slaves configuration.
- Advanced diagnostics on three hierarchical levels.
- Allocation of DP slaves addresses.
- DP slaves provided with a watchdog triggering timeout.
- Protection of DP slaves' access to I/O.
• Possibility to connect or disconnect a station without impacting on
communications between other stations.
• Performance
results:
diagram
presenting the bus
cycle time of a mono-
master Profibus-DP
network, according to
the number of DP
slaves present on
that network (with 2
input bytes and 2
output bytes per DP
slave).
Test conditions: minimum slave time interval = 200 µs; TSDI = 37 × duration of
one bit; TSDR = 11 × duration of one bit.
Profibus-DP LUFP7
gateway specifics
• Network type: PROFIBUS EN 50 170 (DIN 19245).
• Protocol version: v1.10.
• Standard connections: Female SUB-D 9-point connector, which is
recommended for baud rates exceeding 1.5 Mbits/s.
• All baud rates supported (9.6, 19.2, 93.75, 187.5, 500, 1,500, 3,000, 6,000 and
12,000 kbits/s); automatic baud rate detection.
• "DP slave" Profibus-DP station.
• Cyclical data transmissions: up to 244 input bytes and 244 output bytes;
416 bytes exchanged maximum, inputs and outputs included; 24 modules
maximum used to configure these I/O.