Data available via modbus

This maybe isn't the best advice for this question, but I can't find where to ask. For sure some experts Modbus communication engineers using LabVIEW for development and so I hope I can find the answer. At the beginning, Modbus was designed to manage a small amount of data (coils and registers on serial communication). Nowadays ModbusTCP is very popular and so bandwidth is not a problem in general. I would like to know if the current use of Modbus (taking account of the major systems with hundreds of nodes) is always to share the small amount of data (almost stationary signals and i/o). Or now it is used to share, for example, forms of waves and dynamic signals in general? In this case could someone provide a link to some devices that shared dynamic signals via Modbus? Thank you

VIX wrote:

I wonder if now some devices using a set of registers to publish a waveform, for example.

I would recommend against that.  It could if open to some interesting race conditions depending on how the modbus has been implemented.  Imagine a bunch of reading registers while the host has been updated of their.

In short, Modbus was never to be a streaming protocol.  It is intended to the industrial control there where only the last value.  If you want that the waveforms of a device, look for one that will stream.

Tags: NI Software

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