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Data set registers are updated in a fast cyclic interval. Updating of parameter registers happens in a slower interval. In case of a single parameter register read or write request, the parameter value is updated directly from the drive’s internal memory. In case of a multiple parameter register read or write request, the parameter values are updated from the internal memory of the NMBA-01.Presets values into a sequence of holding registers (4X references). When broadcast, the function presets the same register references in all attached slaves.Presets a value into a single holding register (4X reference). When broadcast, the function presets the same register reference in all attached slaves.

Multiple Drive Control 

It is possible to connect multiple (theoretical maximum 247) drives to one NMBA-01. Multiple Drive Control has the same control principle as the point-to-point connection. The NMBA-01 behaves like a multipleaddress node on the Modbus network. The Modbus network can contain several Multiple Drive Control segments. However, the total number of drives cannot exceed 247. Note: Only one type of drive (e.g. ACS 300 or ACS 600) can be connected to one Multiple Drive Control segment.

Multiple Drive Control Connection. 

The Multiple Drive Control connection does not significantly add to the DDCS communication delay. The update interval of the data in the parameter registers is longer than in point-to-point connection, due to the fact that each parameter value is updated from the drive’s internal memory. The delay is most noticeable when multiple parameter register read or write is requested.