Hcmarc-0ct B & R Automation
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The B & R Automation Hcmarc-0ct is part of the HCM Maestro PLC Modules series and supports the ARCNET network protocol with a data rate of 2.5 MBaud. It uses token passing (ISO 802.4) as an access method and can support up to 255 nodes per network, with a maximum station distance of 6 km using amplifiers.
Internal Product Review
The Hcmarc-0ct from the HCM Maestro PLC Modules series by B & R Automation is an ARCNET network module featuring a 2.5 MBaud data rate with token passing (ISO 802.4) access. Supporting up to 255 nodes per network and both coaxial and twisted pair segments, it offers flexible integration for large-scale control systems. This module stands out for its reliable communication and scalable architecture.
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Product Description:
The Hcmarc-0ct is a communication interface module produced by B & R Automation for the HCM Maestro PLC Modules series. Installed in a PLC rack, it links the controller to ARCNET field segments so distributed I/O and motion nodes can share deterministic data. By converting backplane signals into ARCNET frames, the module supports coordinated machine sequences and time-critical interlocks across multiple control cabinets in industrial automation lines.
The module transmits at a sustained rate of 2.5 MBaud, and access to the medium follows a Token Passing (ISO 802.4) scheme, so only the node holding the token can initiate traffic. When coaxial trunk cabling is used, the recommended impedance is 93 Ω. Matching this value minimizes signal reflections that could otherwise distort the Manchester-encoded ARCNET waveforms. A single coax segment may extend up to 300 m, allowing controllers to sit in remote enclosures without repeaters, and each such segment may host 8 active stations before signal loading requires an amplifier. The electrical layer also supports a twisted-pair option, providing an alternative where coax installation is impractical.
Network growth is handled logically and physically. An ARCNET domain supported by this module may contain up to 255 node addresses, keeping configuration tables manageable while still covering sizable plants. With inline amplifiers, station spacing can be stretched so the farthest device sits 6 km from the PLC cabinet, which benefits conveyor or pipeline installations with long corridors. For shielded two-wire media, a segment length of 120 m remains within the timing guard bands used by the ARCNET protocol, and although only 10 stations are permitted on that segment, deterministic token rotation is preserved because the propagation delay stays below the maximum slot time.
