s Information by Communication in Process Analytics

Information by Communication in Process Analytics Communication with process analyzers

Fieldbus and process industry

Process analyzers are intelligent process devices installed in or close by the process stream to be analyzed. They continuously measure chemical or physical parameters or concentration values of chemical components. Their reliability in operation is of extreme importance for running the process properly. For that task measuring values must be recorded, evaluated and transmitted, parameters set or changed, functionalities and adjustments (calibrations) checked or actualized and status signals, for preventive maintenance, controlled.Thus communication between operator and analyzer has become an important part of process analysis. And the relevant device features, offering these communication facilities, belong to the key characteristics of a modern and high performance analyzer.

The demand for extended communication facilities and resulting user benefits drives the increasing interest of the process industry in the fieldbus technology. Utilization of the device intelligence, central access to the devices, cost reduction in plant planning, installation and operation and reduced vendor dependence by device interoperability are further user benefits. Siemens´ last generation gas and liquid analyzers are designed with flexible and extendable interfacing concepts. They have been made field bus suitable now by providing them with communication hard- and software for connection to the leading fieldbus technology of PROFIBUS DP and PA.

Performance by communication

A Profile is the key

Instead of the expensive cabling in former days a single 2-wire connection is sufficient today for digital transmission of e.g. all measuring values of several measuring channels, of status informations as well as diagnosis signals for preventive maintenance.The limited dynamics of 4-20 mA signals must not be tolerated and the time consuming configuration of measuring ranges does not exist any more.The use of simulated measuring values without process medium will create improved safety in plant configuration and help to avoid errors in configuration. Sets of parameters can be put together off-line and afterwards fed and stored into the analyzer. Thus direct handling of the analyzer on the spot can be reduced to a minimum.

Analyzers are fieldbus suitable, if, among others, their functionality is decribed in a uniform way, which is agreed between and utilized by several manufacturers and can be adressed from a central control station via a bus connection.The uniform PROFIBUS “Analyzer profile“, developed recently by 10 manufacturers, solves this task. OXYMAT, ULTRAMAT and SIPAN from Siemens are between the very first analyzers world-wide available, which got this profile (accepted and documented by the PNO) integrated. This enables interoperability and means longer life cycle of the analyzers.

Intrinsically safe or not No question about Both the two versions DP und PA of PROFIBUS are very similar now, since the, for process automation requirements, extended version of the DP protocoll is used today also for DP applications. And the analyzer profile is identical in both versions as well. The only difference left is the physical design of the communication interface: DP uses a RS 485 (non-intrinsically safe), while PA uses the intrinsically safe technology of IEC 1158-2.

Gas analysis, flexible with PROFIBUS DP and PA OXYMAT and ULTRAMAT proven in the field The Siemens gas analyzers OXYMAT and ULTRAMAT are, in all application areas, famous for their outstanding reliability and measuring accuracy. Especially the process industry utilizes this analyzers, if installations are necessary to be performed in critical environments and utmost reliability is required to handle e.g. corrosive process gas samples.Thus Siemens gas analyzers are field proven since decades. So it was only a consequent step to make them also field bus suitable as well, with success! No communication without physical interfaces Profiles and communication protocols do not help at all without the proper physical interfaces.The new Siemens gas analyzers are well prepared for that with their interface

concept. The interfaces are located on optional electronic boards to be placed into the analyzer, thus being easyly interchangeable and also allowing upgrading of already installed analyzers of series 6 and ULTRAMAT 23. This is especially advantageous if a fieldbus is used, which offers two different interface technologies in one bus system, as

PROFIBUS does. Based on the new analyzer profile, whether Ex or non Ex, whether RS 485 or IEC 1158-2, intrinsically safe with PA or highest baud rate with DP, Siemens gas analyzers are flexibel to be equipped and to communicate in a way, that the application requires.

Liquid Analysis, with HART and PROFIBUS very well prepared SIPAN 32, the two wire one cable analyzer

SIPAN 32, flexible in communication

Two wire technology is trendy. Very easy installation, power supply over the bus and unlimited applications in explosive areas are remarkable advantages. The entire wiring, including power supply, is designed intrinsically safe and may, without any negative impact, be simply cut off in case of danger.

Besides conventional operation using the analyzers keybord and large display, communication is possible through the HART and PROFIBUS technology, including upgrading of already installed analyzers. The HART communication provides access to all device specific commands and diagnosis informations and further allows handling of up to 4 sets of parameters.That´s available only from Siemens! HART is internationally standardized and provides communication between PCS, HART compatible field devices and a remote control tool, which may be a PC or a handheld. The standardized handheld operation can happen on the spot, even in

Meas. value 20 mA 2200 Hz 1200 Hz "0" "1"

4 mA Time

hazardous areas, including off-line parameterizing and data refresh.

For fieldbus communication SIPAN is well prepared as well. Based on the new analyzer profile SIPAN 32 can be connected directly with the new, successful field bus version PROFIBUS PA or, via a coupling module, with the widely used and highly qualified PROFIBUS DP. Including all advantages and with no demands left open.

Handling as you like On the spot, with Handheld or PC remote control Handling is complex But shall be easy Analyzer handling (parameterizing, status recording, servicing) normally is quite complex, but shall be easy and safe. And it shall be possible directly at the device, but also from a central PCS or PC. And, of course, in both cases with the same graphical user interface! And, finally, it should also be possible, to control with one single tool, analyzers and field devices of other manufacturers, operated at the same bus. A very ambitious task, which the Siemens tool SIMATIC PDM (Process Device Manager) performs very well for Siemens analyzers.

thanks to windows. The complex parameter structure of the analyzer will appear clearly arranged (“Explorer“-like) and parameterizing can be done simply by “clicking“.

SIMATIC PDM makes it SIMATIC PDM is software, which, as universal tool, runs on a PC or Laptop under Windows 95/98/NT and which can be integrated as well into the SIMATIC PCS 7 process control system.The new analyzer profile, accepted and published by PNO as data sheet of PROFIBUS PA 3.0, has been implemented recently into SIMATIC PDM. SIMATIC PDM supports PROFIBUS DP and PA and HART together with external multiplexer or as stand-alone version using the same graphical user interface. Many operators will be quite familiar with this user interface,

Communication on the spot Possible as well Some users may still prefer the direct access to the analyzer on the spot or have no bus system installed yet. Also they have no restrictions in handling the analyzers at all! Via keyboard of the analyzer, via Laptop using the device interface or via handheld (liquid analyzers). And last but not least via the servicePC interface SIPROM GA available in all gas analyzers. Realizing innovations and, at the same time, continuing with well proven device features, this concept of Siemens Process Analytics will keep the user well equipped for future challenges.

Analyzers concerned Analyz er

Measuring principle

Comminication

Operating and Monitoring

OXYMAT 6

Paramagnetic

PROFIBUS DP/PA

Keyboard, PDM, PCS 7

ULTRAMAT 6

NDIR

PROFIBUS DP/PA

Keyboard, PDM, PCS 7

ULTRAMAT 6/ OXYMAT 6

NDIR/ Paramagnetic

PROFIBUS DP/PA

Keyboard, PDM, PCS 7

ULTRAMAT 23 NDIR/ Electrochemical

PROFIBUS DP/PA

Keyboard, PDM, PCS 7

SIPAN 32

PROFIBUS PA HART

Keyboard, PDM, PCS 7, Handheld

Conductivity, pH Redox Dissolved O2

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