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Harmony DCU is a microprocessor-based control unit which interfaces to local frame mounted or Profibus network connected S800 / S900 I/O for monitoring and controlling a process on a stand-alone basis. The difference between the Harmony DCU and the DCU3200 is strictly software based. The Harmony DCU uses software at SR2.0 or later while the DCU3200 uses software at version S7R1 or earlier. Additionally available are interfaces to serial connected I/O such as Modbus and Allen Bradley DF1 protocols.
Designed for batch, sequential, and regulatory control, the Harmony DCU includes a full range of digital and analog control functions implemented by Controlware II application software. The Harmony DCU supports a redundant Ethernet process highway with each Harmony DCU capable of interfacing to over 1,000 I/O points.