Field Bus Specification

1 FILEDBUS REQUIREMENTS 1.1

Transmitters shall be tested, approved and certified as being Fieldbus compatible including meeting the standard and interfaces properly, by FF. Blocks used in the Transmitters shall also be certified. Uncertified blocks available in field device shall not be used.

1.2

Transmitters shall be connected easily by plug and play.

1.3

Transmitters shall be easily configurable using FF techniques to perform complex control tasks without interaction from DCS, if required.

1.4

Provide online monitoring like device failure, memory failure, power failure etc.

1.5

Transmitters shall report themselves to the automation system and make available all information stored in device sheet as soon as their wires are connected to their permanent wiring terminals (plug and play).

1.6

It shall be possible to add / remove new / existing transmitters to/from Fieldbus at any time without any restriction. Broadcast the change to all Fieldbus devices.

1.7

Transmitters shall be able to upload / down load data and programs over the Fieldbus.

1.8

Each Transmitter shall have interoperability through Device Descriptions (DDs) to provide information needed for DCS or other hosts to understand the meaning of data send by the field device.

1.9

Transmitters shall have standard Device Descriptions provided by the FF, in addition to vendor specific features (calibrations & diagnostic procedures) to their devices.

1.10

Supply standard DDs and device suppliers specific incremental DDs in electronic format (CDs / DVDs).

1.11

All DDs shall be read directly from devices over the Fieldbus by uploading. Also provide facility to read the DD from host side also.

1.12

Each device manufacturer shall provide FF approved interoperability test report for each device / model Nos. so that all FF certified device from different manufacturers can communicate and operate together. The test report to identify all levels of DDs defined by FF (universal,

function block, transducer block) and Manufacturer specific parameters. 1.13

It shall be possible to connect different vendor devices to the same Fieldbus and shall allow operation with only one version of host / HMI program.

1.14

Transmitters on the main Fieldbus segment shall be able to communicate at a speed of 31.25 Kbps, as a minimum. Transmitter shall support peer-to-peer communication.

1.15

Transmitters shall have valid interoperability test clearance certificate like ITK4.1 for FOUNDATION™ Fieldbus or equivalent.

1.16

The operating voltage levels available at bus level shall typically be minimum 9.0V and maximum 32V DC. Transmitters, which don’t require power supply, shall be capable of operating on the Fieldbus without affecting the existing Fieldbus voltage.

1.17

No Fieldbus instrument, in general, shall draw more than 28mA current from the bus power supply.

1.18

None of the Fieldbus devices shall be polarity sensitive.

1.19

Transmitters shall have capability to perform continuously their own self-diagnostics to check their own health state.

1.20

Transmitters shall have a reference accuracy of ± 0.075% of calibrated range and shall preferably have 30:1 rangeability (Turndown Ratio).

1.21

Transmitter shall be able to update output at the rate of 250milli second.

1.22

Transmitter shall have selectable damping feature over and above sensor response time. This shall be user selectable from 0 to 36 seconds, as a minimum.

1.23

Each transmitter shall be provided with an integral output meter, which shall be able to display, measured variable with its units, which shall be user configurable.

1.24

Each transmitter shall have capability to provide input and control function blocks such as signal linearization, input selector, arithmetic function, integrator and PID control.

1.25

Transmitter shall be able to provide real time instrument diagnostics.

1.26

Each transmitter shall have capability to become device link master.

As a minimum, the transmitter shall be able to deliver following diagnostic data a)

For Transmitter Sensor temperature, failure type (sensor or electronics), manufacturer and model No., device material of construction, application type (gauge pressure, absolute pressure, differential pressure etc), calibration data, calibration date and time, impulse line plugging, transmitter diagnostics.

b) All the above features should also be available in the transmitter.