Cable recommendation:
Impedance:
135 to 165 Ohm, at a measurement frequency
between 3 and 20 MHz
Cable capacity:
< 30 pF per metre
Wire diameter:
> 0.64 mm
Wire 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
Prior to installation, please note:
●
Connect maximum 32 devices to one segment.
●
If more devices are to be connected:
-
Allot devices to different segments.
-
Connect segments using repeaters.
●
Install fieldbus cables at a distance of minimum 20 cm to other cables.
●
If possible, fieldbus cables should be laid in a separate, conductive, and earthed
cable tray.
●
Ensure absence of equipotential earth bonding differences between the indi-
vidual devices at fieldbus (perform an equipotential earth bonding).
1,500
500
187.5
≥
93.75
Baud rate [kbit/s]
200
400
1,000
1,200
Maximum segment length [m]
6.2.
Connection via bayonet connector
Figure 10: Arrangement of connections
[XK1] Power terminals (mains cables)
[XK2] Control contacts/fieldbus cables
↑
from previous device
[XK3] Control contacts/fieldbus cables
↓
to next device
Cross sections:
●
Power terminals: max. 1.5 mm² flexible
●
Control contacts: max. 1.5 mm² flexible
15
SGM 04.1 – SGM 14.1 / SGMR 04.1 – SGMR 14.1
Profibus DP
Electrical connection
