Until now, plants only could allow or block all Modbus traffic on a control or SCADA system, explain the firms. However, the $500 device, which is certified by Modbus-IDA, enables, e.g.: blocking all firmware upgrades while allowing normal human/machine interface (HMI) traffic; tailoring programmable-logic-controller access permissions — such as read only for monitoring panels, read/write for HMIs, and full programming for engineering workstations; restricting access permissions to specific memory locations in a controller; filtering invalid traffic; and enforcing read-only access to safety instrumented systems.
Another interesting product extends the analyses possible via the New Sensor and Sampling Initiative (NeSSI), a modular miniature approach that can provide flexibility and cost savings for sampling systems (www.ChemicalProcessing.com/articles/2008/147.html). C2V, Enschede, the Netherlands, showed off a micro gas chromatograph available with a standard NeSSI footprint. The stainless-steel C2V-200 micro GC is a 1-channel GC module with easily switchable column cartridges. The columns can be heated to 180°C and provide ppm detection levels. Four columns are available: general-purpose for use over a broad temperature range for analyzing a wide variety of compounds; one suitable for CO2, H2S, halogenated compounds, C1-C6 hydrocarbons and other materials; one for alcohols, aromatic hydrocarbons, esters, etc.; and one for gases such as He, H2, O2, CH4, CO and N2.
The company says future enhancements should include backflush, an RS232 data bus, on-board data logging, and a 1-ppm detection limit.
So, while its size and attendance might not be as large as they once were (a situation afflicting many trade shows), ISA Expo remains a place to find some interesting and potentially important developments.
Mark Rosenzweig is editor in chief of Chemical Processing. You can e-mail him at email@example.com.