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PROFIBUS Redundancy Link Module RLM01

Field devices equipped with only a single PROFIBUS DP interface can be integrated in the redundant PROFIBUS network by using the Redundancy Link Module RLM01.

Acting like an active switch, it converts two redundant lines to one PROFIBUS DP line or vice versa. The RLM01amplifies signal form and amplitude of the incoming data and monitors activities and error statuses of all three lines.

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Field devices equipped with only a single PROFIBUS DP interface, can be integrated in the redundant PROFIBUS network by using the Redundancy Link Module RLM01. Acting like an active switch, it converts two redundant lines to one PROFIBUS DP line or vice versa. The RLM01amplifies signal form and amplitude of the incoming data and monitors activities and error statuses of all three lines.

RLM01 at a glance:

  • Three PROFIBUS ports
  • Transparent for PROFIBUS configuration, i.e. no slave address required
  • Supports transmission rates of 9.6 Kbps to 12 Mbps
  • Serve up to 31 Profibus clients. While using repeaters (optical - electrical), this number can extend
  • Errors are signalized via an LED on the frontplate and a signaling contact
  • Specific messages that can be read at the 8-pin terminal strip serve diagnostic purposes
  • CE, UL and CSA certified
  • Type Approval Certificate "Germanischer Lloyd" for use in marine area.  
Conversion of one simple, non redundant PROFIBUS line into two reciprocally redundant lines A/B and vice versa.

  • Use on PROFIBUS DP/FMS lines
  • Automatic line selection
  • Transmission rate 9.6 kBit/s .... 12 MBit/s
  • Communication Monitoring
  • Repeater functionality
  • Wire cross section 8-pin terminal strip, up to 1.5 mm²
  • Redundant power supply, 24 VDC (+20 .. +33 V), 150 mA typically at 24 V
  • Operating temperature 0 ... 50°C
  • Status and error display
  • Power supply monitoring
  • Potential-free signaling contact
  • Easy assembly on a DIN mounting rail 
The RLM01 module can be positioned directly next to a master, in front of a bus segment with several slaves, or in front of an individual slave. Several PROFIBUS stations with redundant couplers can be connected directly to the PROFIBUS that has been made redundant by RLM01. Stations with just one interface can be positioned either on the A line or on the B line. Each RLM01 PROFIBUS interface can operate up to 31 PROFIBUS stations.

RLM01 Application

Line redundancy:
The module reinforces die signal form and amplitude of the data received and monitors all three lines with regard to activity and faults. Any faults that are recognized are indicated with the aid of a LED on the front panel. Suitable messages are available for diagnostic purposes and can be picked up on the 8-pole terminal strip.

Combining redundant lines:
The data that arrives first via line A or line B (see the diagram above), with the correct start of frame, is forwarded to connection M. If the data arrives at the same time, either line A or line B is selected at random. If an error is detected at line A, the control logic switches to line B, which is still available. The procedure is the same in reverse for line B.

Splitting a non-redundant line:
Data arriving via line M with the correct start of frame is passed in parallel to the other two connections, A and B. If the start of frame is incorrect, the control logic does not output any data at A and B.
For increased availability of the RLM 01 itself, a redundant power supply with 24 V d.c. can be connected. The monitoring logic checks whether both voltages are available and reports any malfunction that may occur. 

Application on ships and maritime systems
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 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. 

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