FDT offers device setpoint confidence

22 October 2013

For one chemical intermediate manufacturer in Switzerland, FDT Technology and the company's chosen FDT Frame Application, have provided the peace of mind that its measurement device setpoint documentation is always up to date. Suzanne Gill reports.

The Swiss site of the SI Group, a developer and manufacturer of chemical intermediates, phenol resins, alkylphenol resins, and alkylated phenols, is based in Pratteln, where the company produces a range of intermediates for the plastics industry.

The site relies on FDT (Field Device Tool) Technology used in the Endress + Hauser Frame Application FieldCare, the plant asset management tool. FieldCare enabled with FDT Technology provides this site access to the majority of its field measurement devices, providing diagnostic data from a central location.

Janos Horvath, head of instrumentation and control for SI Group in Pratteln, explains how this came about: “Our introduction to FDT was really through the use of Endress + Hauser’s FieldCare plant asset management tool,” he said.

This FDT-based asset management tool, FieldCare was the first to pass the FDT Group’s conformance test. It offers a solution to configure intelligent devices and offers a simple method of checking the continuing health of devices that support FDT. The tool provides a range of functionality – from device parameterisation, through to engineered condition monitoring. Using device status information it is able to provide a simple tool for checking the health of a device.

The plant installed its first radar level transmitters that supported FDT technology over 10 years ago. Horvath went on to explain that the facility also makes use of the manufacturer-independent PACTware software (Process, Automation, Configuration Tool). Its independence is possible because of the standardised interface description of the FDT concept and using an appropriate DTM (Device Type Manager) to set up and adjust field instruments including pressure transmitters and radar level sensors. “We find this tool to be easy to use and it makes it easy to document the setpoints etc.,” said Horvath.

“Work processes have changed for engineers at the plant,” continued Horvath. “In the past we would take measurements manually or would need to use different tools for each instrument. With FDT-enabled solutions we are able to use just one tool for almost every device. The capability of FieldCare and the DTM to be product, supplier, host system and protocol independent makes it a universal tool allowing standardised work processes
Remote measurements

“We now take field device measurements remotely, usually from the central office at the facility, so we do not have to travel around the facility to the same extent that we did in the past and data is more quickly available to use.” Because the Pratteln facility consists of three production buildings and two infrastructure buildings, being able to access data remotely can offer some impressive manpower time-savings. “We are now able to connect with every part of the plant from the office,” said Horvath. “This is a particular benefit because some areas of the plant are hazardous areas, and a permit is needed to access these areas to collect data manually.”

For Horvath, the real benefit, however, is not the manpower time he has saved, it is the fact that the last setpoints are now properly documented that is one of the biggest benefits of the system. “We are always confident that we have the latest setpoint data,” he said.

To access and collect data a four strong engineering team uses two laptops for data collection around the facility, and one fixed PC for use when in the office.

At present, around 70% of plant measurement devices at the facility are connected to the FieldCare asset management tool. Although the plant does still employ some older equipment, and also some very specialist devices used for water treatment, the majority of devices used in the facility are now supported by a DTM or have available DTMs and this percentage is growing. “Today, when we look at purchasing new devices we will look more favourably on devices that support FDT. Currently we are changing around two or three devices every week,” he said

The fieldbus independence offered by FDT Technology was also a bonus for Horvath. He said: “One of the benefits of FDT is that we can use one tool across a wide range of different devices which means that we are not tied into one vendor for our device selection. Having this independence makes it easier for us to choose the best device for us for each application. Being FDT enabled is not our main requirement when specifying new equipment. However, it is a big bonus – and we will generally choose a device with an available DTM, where practicable. We do need to choose the best device for an application and the fieldbus is not our main criteria. So, it is a benefit for us if all our devices can use the same independent bus.

“I have also found that FDT devices are cheaper than, say, similar Profibus enabled devices. Of course, with a DTM-enabled solution you usually have a maximum of four readable process measurements while Profibus can offer more possibilities. However, with a pressure or temperature transmitter we are really only interested in getting one measurement, so the FDT Technology adequately meets our needs.”

Moving forward
Moving forward, Horvath hopes to be able to use FDT more proactively to gain further value from the technology that already exists in devices at the plant. He said: “We are currently looking at using more of the diagnostic capabilities offered by the intelligent device and using FDT Technology to access it. A diagnosis tool that will alert us automatically if a device is going to have problems will enable us to ensure that it is replaced or fixed before it has an effect on productivity. Making better use of this capability will allow us to be more proactive with maintenance.”

Offering a specific example of the benefits this could offer in his plant, Horvath said:
“For example, we have some temperature transmitters with two PT100s and if one is damaged it will automatically switch to the other, without letting us know that the change has occurred. The diagnosis tool in FieldCare will alert us to the fact that one of the PT100s has been damaged, and will give us an opportunity to ensure it is changed when the plant is next shut down.”

Although the engineering team at SI Group in Pratteln do appreciate the benefits that FDT can offer, the move to remote working was quite a drastic change for many of the technicians. Horvath explains: “Any IT or network issues can be frustrating for the engineers as they are not IT experts and may not recognise the problem or be able to rectify it. However, we do need them to work with the equipment to ensure that we do not lose the latest setpoint data. It would be very problematic if a device needed to be replaced and we did not know which setpoints to use. The documentation element of the system is vital and this is the reason that we insist that the engineers always use the remote technology supplied to them, even if they are out in the plant and standing next to the device they are working on.”

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