About profibus pa, 1 outline, 2 internal structure of dpharp – Yokogawa EJX115A User Manual
Page 16: 1 function block, 3 logical structure of each block, 4 wiring system configuration, About profibus pa -1, Outline -1, Internal structure of dpharp -1 3.2.1, Function block -1
<3. About PROFIBUS PA>
3-1
IM 01C25T04-01EN
3. About PROFIBUS PA
3.1 Outline
PROFIBUS PA is a widely used bi-directional
digital communication protocol that enables the
implementation of technologically advanced
process control systems. The DPharp EJX/EJA
Series PROFIBUS PA communication type meets
the specifications of PROFIBUS Nutzerorganisation
e.V. and is interoperable with devices from
Yokogawa and other manufacturers.
3.2 Internal Structure of DPharp
3.2.1 Function Block
The transmitter contains five function blocks that
share the following functions:
(1) Physical block
• Manages the status of transmitter hardware.
(2) SENSOR Transducer block
• Converts sensor output to pressure, static
pressure, and capsule temperature signals, and
transfers to the AI function blocks.
• Carries out square root signal characterize
extraction.
• Flow rate calculation.
(3) LCD Transducer block
• Controls the display of the integral indicator.
(4) AI (Analog Input) function block
• Condition raw data from the Transducer block.
• Output differential pressure, static pressure
and capsule temperature signals setting via the
channel.
• Carry out scaling, damping and square root
extraction.
(5) Totalizer function block
• Execute totalizer management of signal from AI
function block.
• Output totalized signal.
3.3 Logical Structure of Each
Block
F0301.ai
DPharp
PROFIBUS PA
Physical block
Block tag
Parameters
LCD
Transducer block
Block tag
Parameters
LCD
Totalizer function
block
AI function
block
AI function
block
Sensor
input
Output
SENSOR
Transducer block
Block tag
Parameters
AI function
block
Block tag
OUT
Parameters
Sensor
Figure 3.1
Logical Structure of Each Block
Setting of various parameters, Bus addresses, and
TAG is required before starting operation.
3.4 Wiring System Configuration
The number of devices that can be connected to
a single bus and the cable length vary depending
on system design. When constructing systems,
both the basic and overall design must be carefully
considered to achieve optimal performance.