ABB DSCA114 57510001-AA MasterPiece - Communication Module
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
combination). 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 integrated 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.
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.
You can press down the orange-coloured pin using a narrow screwdriver to open the
cage tension spring. Only press the pin in far enough to feel a noticiable resistance
( about 1 mm below the upper surface of the terminal strip ). Now insert the
stripped wire as far as it will go into the large hole on the left. Reliable contact is
only ensured if the cage tension spring grasps the wire and not the insulation around
it. The cage tension spring can receive solid wires or rough wire strands with cross
sections from 0.14 to 1.5 mm2. Please use flexible or rough wire strands with the
lowest possible cross section for better handling and reduced mechanical stress to
the terminal strip.
Terminal: Short description: Meaning:
8 F1 Potential-free alarm contact (closed in fault-free
operation) 7 F2
6 L2+ Redundant power supply and associated ground
connection 5 M
4 L1+ Cable jumper from L1+ to L2+ if no red. voltage is
present
3 L1+ +24 V power supply and associated ground con nection 2 M
1 E Connection for PE conductor

Configuration of the RLM 01 merely involves setting the baud rate. It should be set
with the rotary switch on the front panel before turning on the power supply. You
can select baud rates of from 9.6 kbd to 12 Mbd. If the baud rate is changed during
ongoing operation, you should push the reset button once briefly to reset the control
logic and the counters etc. to a defined initial state.
Example: The switch shown is at setting 3, corresponding to a baud rate of 1.5 Mbd
Switch setting: Baud rate: Unit:
0 12 Mbd or MBit/s
1 6
2 3
3 1.5
4 500 kbd or kBit/s
5 187.5
6 93.75
7 19.2
8 9.6
9 -/- No function
RLM01 is certified for applications on ships and maritime systems by the Germanic
Lloyd (GL). To meet the increased requirements regarding EMC and overvoltage,
RLM01 must have one or two "24 VDC power supply filters (surge)" depending on
the supply (single / redundant). The supply of several RLM01 behind one filter is
not admissible. The max. length of the lines between filter and RLM01 must not
exceed 1 m. Possibly needed fuse elements have to be arranged before the filter. The
electrical connection to ground potential is effected via the module attachment as
with RLM01. The following example shows the interconnection in case of a
redundant supply of RLM01. For a single supply of RLM01, the L2+ terminal has to
be bridged with the second L1+ terminal.