Streaming precise positioning data from valve positioners

05 July 2021

The ability to use existing industrial Ethernet and wireless networks in process manufacturing plants and automation facilities has made data exchange within a facility and even throughout global corporate networks easier than ever.

Process and diagnostics data from smart HART digital field instruments can be being shared with mid and higher-level control, asset management and data information systems without having to upgrade expensive process control systems.

Moore Industries has seen numerous customers using its HES HART to Ethernet Gateway System to collect and transmit smart HART device data to higher-level systems over Ethernet via MODBUS/TCP for predictive analysis and control decision-making.

In a recent application, a customer needed to control two valves that had Siemens smart HART positioners installed and had a further requirement to communicate actual valve position over Ethernet using MODBUS/TCP to their higher-level systems.

Originally the customer wanted to use the Moore Industries model 535 or 545 PID Controllers to control the two valves in order to balance and/or limit each valve’s travel to maintain final pressure through the system, but it was quickly realised that the controller’s communication capability did not support Modbus/TCP and this was required by the  installed DCS and Historian.

Moreover, the higher-level monitoring systems wanted to monitor and record where actual stem positions currently were, not where the valve controller was driving them to via the 4-20mA signal.  This could only be obtained by reading the HART data from the smart positioners.

The HES 4-channel model was utilised to pick up the actual stem position HART data from the smart positioners and send it to the higher-level systems – no longer requiring the valve controller to communicate the CV (Controlled Variable), or desired stem position, output. The HES was an effective and economical solution that enabled the customer to take advantage of existing HART data from the positioners and share that critical data with their higher-level systems on their existing Ethernet infrastructure.

More about HES
Timely knowledge about the process can result in better decisions and faster preventive action. Getting data from HART devices to MODBUS/TCP and HART-IP based monitoring and control systems at the speed of Ethernet, is made possible with the HES HART to Ethernet Gateway System. Up to 64 Smart HART devices can be connected to the HES. 

The HES supports HART field devices both old and new with HART 5, 6 and 7 revisions, including devices such as Coriolis, magnetic, vortex, ultrasonic and multivariable mass flowmeters along with pressure, pH, level, temperature transmitters, and even smart valve positioners. 

The HES is simple to configure over Ethernet using PACTware or other FDT compliant host with supplied HES DTM. 

All of the HART data can be viewed from connected field devices in read-only mode with any web browser via the HES’ built-in web server or a MODBUS/TCP compliant host. The HES also supports HART-IP, which allows you to monitor any of the connected HART device variables, HES variables, or diagnostics. Support for these open industrial protocols enables interface with any process control or asset management system while taking advantage of any Industrial Internet of Things (IIoT) initiatives that facilitate the propagation of process data to higher level corporate or analytical systems.

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