Setting up a network
Section 2-3
15
Fieldbus connector
The connector plug to be used on the C200HW-PRM21 is a 9-pin male sub-
D, preferably with a metal case, and a facility to connect the shield of the
cable to the case. The cable should at least be connected to pin 3 (B-line) and
pin 8 (A-line) of the connector.
At baud rates of 1.5 Mbit/s or higher, always use special PROFIBUS-DP
plugs with built-in series inductances, to ensure that cable reflections caused
by the capacitive the load of each unit are minimised.
Connector plugs with built-in inductors, as shown here schematically, are
available from various manufacturers.
A standard 9-pin sub-D plug can only be used if the C200HW-PRM21 is at
the start or at the end of a bus segment, or on a stub line at baud rates of 500
kbit/s or less.
To ensure electro-magnetic compatibility (EMC), the shield of the cable
should be connected to the metal case of the connector. If this is impossible,
use pin 1.
If the Unit is installed within a control cabinet, the cable shield of the bus cable
should be electrically connected to a grounding rail as close as possible to the
cable lead-through using a shield grounding clamp or similar. The cable shield
should continue within the cabinet to the fieldbus device.
Ensure that the PLC and the control cabinet in which the device is mounted
have the same ground potential by providing a large-area metallic contact to
ground (use e.g. galvanised steel to ensure a good connection). Grounding
rails should not be attached to painted surfaces.
You may find further information about
•
Commissioning of PROFIBUS equipment
•
Testing the PROFIBUS cable and bus connectors
•
Determining the loop resistance
•
Testing for correct bus termination
•
Determining the segment length and cable route
•
Other test methods
•
Example of an equipment report
in the PROFIBUS guideline "Installation Guideline for PROFIBUS-DP/FMS"
(PNO Order No- 2.112), which is available at every regional PROFIBUS user
organisation.
A
A
B
B
3
8
in
d
u
c
to
rs
to next
station
outside
cabinet
ground rail
Содержание C200HW-PRM21
Страница 1: ...C200HW PRM21 PROFIBUS DP Master Unit OPERATION MANUAL Cat No W349 E2 2...
Страница 2: ......
Страница 3: ......
Страница 4: ......
Страница 5: ...C200HW PRM21 PROFIBUS DP Master Unit Operation Manual Produced May 2000...
Страница 6: ...iv...
Страница 8: ...vi...
Страница 12: ...x...
Страница 66: ...Debug mode Section 4 4 50...
Страница 98: ...Messages Section 6 4 82...
Страница 108: ...Maintenance Section 7 3 92...
Страница 110: ...94...
Страница 112: ...96...
Страница 116: ...100...
Страница 120: ...104...
Страница 124: ......
Страница 126: ...Authorised Distributor Cat No W349 E2 2 Note Specifications subject to change without notice Printed in the Netherlands...