About Fieldbus; Overview; Internal Structure; System/Network Management Vfd - YOKOGAWA Admag TI Series User Manual

2.

About Fieldbus

2.1

Overview

Fieldbus is a widely used bi-directional digital communication protocol for field devices that
enable the simultaneous output to many types of data to the process control system.
The ADMAG TI Series Fieldbus communication type employs the specifications standardized
by FieldComm Group, and provides interoperability between Yokogawa devices and those
produced by other manufacturers. Fieldbus comes with software consisting of AI, DI, IT, AR, PID
and MAO (only AXG) function blocks that enable the flexible implementation of systems.
For information on other features, engineering, design, construction work, startup and
maintenance of Fieldbus, refer to "Fieldbus Technical Information" (TI 38K03A01-01E).
2.2

Internal Structure

This product contains two Virtual Field Devices (VFD) that share the following functions.
2.2.1

System/network Management VFD

• Sets node addresses and Physical Device tags (PD Tag) necessary for communication.
• Controls the execution of function blocks.
• Manages operation parameters and communication resources (Virtual Communication
Relationship: VCR).
2.2.2

Function Block VFD

(1) Resource block (RB)
• Manages the status of hardware.
• Automatically informs the host of any detected faults or other problems.
(2) Sensor transducer block (STB)
• Calculates the flow velocity, volumetric flow rate, mass flow rate, calorie, and totalized value
from a sensor output.
• Transfers the calculated process value to the AI and DI function blocks (totalized value only
to the AI function block).
• Obtains a temperature value from the MAO function block.
(3) Diagnosis transducer block (DTB)
• Obtains transmits the adhesion resistance, electrode potential, flow noise and conductivity
from the sensor output, and transfers them to the AI and DI function blocks.
• Has functions to set each of the adhesion, flow noise, conductivity, empty check and
verification functions and to monitor them.
<2. About Fieldbus>
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