Drehmo c-matic - Bus Cable

DREHMO - MaticC Profibus DPV0/DPV1 Page 8 of 28
Complementary operating manual
The circuit board is equipped with different connection terminals. The small connection terminal
can be used for a wire cross section of up to 0,5mm², the large connection terminal for up to
2,5mm².
Table 1: Process structure
Connection terminal small –
bus connection , optional inputs
AWG 20 - 28 0.08 – 0.5 mm²
Connection terminal large –
external 24V input
AWG 12 - 20 0.5 – 2.5mm²
The bus circuit board DiM-10 is equipped with RS485 transceivers. For that reason the internal
length of the stub cable does not affect the signal quality of the bus segment.
Pay attention to the ESD protection of the bus circuit board. Especially good personal
earthing is required.
If the bus circuit board is disassembled from its housing transport and storage must
meet ESD requirements.
3.3 Bus cable
Only cables according to IEC 61158 and 61784 standards, cable type A, may be used for Profibus
DP wiring.
A maximum of 32 devices can be connected to a segment. If more devices should be connected
to the Profibus connect the segments using repeaters. Respect a distance of minimum 20 cm
between the bus cable and other cables. If possible, bus cables should be laid in a separate,
conductive, and earthed cable tray.
Make sure to avoid potential differences between the individual devices on the bus (perform a
potential equalisation).
For Profibus wiring the directives for segment length and maximum spur/stub length have to be
observed.
Bitrate [kbit/s]
Bit time
Max. segment lengt
h
[m]
Max. stub length [m]
9,6 104 µs 1200 500
19,2 52 µs 1200 500
45,45 22 µs 1200 100
93,75 10.6 µs 1200 100
187,5 5.3 µs 1000 33
500 2 µs 400 20
1500 666 ns 200 6,6
3000 333 ns 100 -
6000 166 ns 100 -
12000 83 ns 100 -
Connection data:
Strip length: 5 to 6 mm
Wire insertion angle relative to PCB: 40°
Connection technology: CAGE CLAMP
®
PCB terminal with slider
(WAGO series 218)
Cross section (solid-conductor): 0.08 to 0.5 mm²; AWG 28 to 20
Cross section (multi-conductor): 0.08 to 0.5 mm²; AWG 28 to 20
Cross section (multi-conductor): up to 0.25 mm², AWG 28 to 23
(ferrule without plastic shroud allowed)