Installation - ABB RLM01 Inbetriebnahmeanweisungen

Commissioning

3.4 Installation

Note:
12
The redundant PROFIBUS lines are connected to the two terminals A and B. Termi-
nal M is provided for the non-redundant PROFIBUS line. All three PROFIBUS con-
nections A, B and M are designed uniformly with 9-pin Sub-D connectors (sockets).
The pin assignment conforms to the PROFIBUS standard. RLM 01 uses only pins
3+8 for data transfer and 6+5 for power supply to an external resistor combination for
bus termination. The following table shows the maximum assignment for PROFIBUS
usage.
Pin: Short description:
1 Shield
2 -/-
3 RxD/TxD, positive
4 CNTR-P
5 DGND
6 VP
7 -/-
8 RxD/TxD, negative
9 DGND
If terminals A/B of RLM 01 are positioned at the beginning or end of a bus segment,
two terminals must be provided with one bus termination each (resistor combina-
tion). The same also applies for terminal M if it is located at the beginning or the end
of a PROFIBUS segment. It is preferable to use PROFIBUS terminals with an inte-
grated resistor combination that can be turned on and off. A short-circuit-proof
power supply to supply the resistors located in the connector is available on pins 5
(VP+) and 6 (DGND). The designation A/B in the following figure refers to the cables
in the PROFIBUS cable and not to the redundant PROFIBUS cables, which are also
named A/B.
Fig.: Resistor combination in the PROFIBUS connector
Use only shielded PROFIBUS connectors of suitable design. The connectors should
preferably have a cable connection that is angled down at 35° and is no wider than
18 mm.
The power supply and alarm lines are connected directly to the terminals labelled 1
to 8. If it is necessary to replace the module, you need only remove the terminal
strips. The maximum of 8 cables remain connected. The functions of terminals 1... 8
are given in the following table.
Meaning:
Shield
Not assigned
Receive or transmit, positive
Repeater control signal
Earth for digital signals
Power supply for external terminator
Not assigned
Receive or transmit, negative
Earth for digital signals
3BDD011600R05