Hardware

For most systems, DSU(s) obtain data from field instruments via direct communications, but data may also be acquired using I/O interface modules. Our systems are built according to the analysers and instruments on plant, and the available communications protocols from these sensors. If direct communications are not available, Envirosoft utilise the proven Advantech ADAM modules, either serial (RS232 or RS485) or Ethernet. The advantage of the Ethernet base units is that multiple computers can access the data. RS485 units may be useful for remote I/O over long distances (>1 mile) and can use existing site analogue cables. The ADAM I/O base units are expandable with individual I/O cards, and analogue and digital inputs are acquired by the DSU, where the primary data is stored before onward transmission to the Data Acquisition System PC(s). Where analogue or digital retransmission is a requirement, output cards may be fitted.

All emission data is usually accessed directly from the CEMS analysers and stored on the DSU’s integral SSD, then transmitted to all CEMS PCs on the system via Ethernet. If the host PC is unable to accept data for a period (when off or disconnected) all missing data is automatically downloaded when reconnected. The storage capacity of our DSUs is usually greater than 10 years.