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Remote Data Acquisition Module provides up to 100 Channels.

Using powerful free software incorporated into one of the standard Distributed Process Interface (DPI) modules (PD 60xL) from the M36 range of process control modules produces a versatile data logger that can be configured to conditionally log between 1 and 100 variables.

The programmed unit is configured via the P-NET fieldbus using a PC utility, where individual channels can be named, and the location of variables for logging can be defined. Each channel can be individually set up for an appropriate sample rate, when further selectable conditional testing can be performed to determine whether a new log value should stored. Such tests include assessing whether the value of a variable has deviated by a defined amount or has exceeded a certain set point. An additional enabling variable can also be monitored to ensure that a measurement log is only taken under certain circumstances e.g. pump running.  Measurement transmitters can either be located local to the logging DPI, where they would most likely be connected to an attached cluster of I/O modules, and/or be taken via P-NET from various parts of the factory or building fieldbus network, or even from a distant location having a connection to the Internet or GSM phone network.

The storage capacity of the data logging enabled DPI, depends on the selected frequency of sampling and the number of channels being used.  A data logger could be left unattended for weeks or even months, but it is likely that the data collected would be required to be seen in real time or at least on a regular short term basis, e.g. daily. Here, aspects of a low cost SCADA system called Visual VIGO, running on one or a number of PCs, extracts and re-stores data not already transferred, onto the PC hard disc. This can be done either on a batch basis or in real time. The data can then be displayed graphically in the form of plotted curves or as a table showing every log point, using DAQ components provided by the SCADA system. Either form can be scanned and searched for specific data, such as max and min points or date/time. Meanwhile, the collected data can be used by other applications such as Excel, Access, SQL, perhaps for integration into enterprise wide ERP systems.

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