Process Data High-Speed Response Function; Overview - YOKOGAWA UTAdvanced Series User Manual

4.6 Process Data High-speed Response Function
4.6.1

Overview

RS-485
rear terminal
communication
connection
Periodical read of
the process data
RS-485
rear terminal
communication
connection
IM 05P07A01-01EN
The UT75A/UT55A/UT35A/UP55A/UP35A has a function that reads periodically the
process data from the UT75A/UT55A/UT35A/UP55A/UP35A itself and the process data
from other serial devices connected to the RS-485 serial communication line and stores
them in the UT75A/UT55A/UT35A/UP55A/UP35A.
With this function, when process data read-out command is sent form the host computer,
the UT75A/UT55A/UT35A/UP55A/UP35A can return the process data stored in itself at
high speed, without communicating with the serial devices one by one. This function is
called the Process data high-speed response function.
The figure below shows the data flow when the host computer reads process data in the
case of not using / using the function.
When Process Data High-speed Response Function is not Used
Response speed : Low
Host computer
(4)
Ethernet 10BASE-T cable
(1)
UT75A/UT55A/UT35A/UP55A/
UP35A with Ethernet function
RS-485
communication address = 01
(2) (3)
RS-485 communication
RS-485 communication RS-485 communication
address = 02 address = 03
UTAdvanced Series
When Process Data High-speed Response Function is Used
Response speed : High
Host computer
(2)
Ethernet 10BASE-T cable
(1)
UT75A/UT55A/UT35A/UP55A/
UP35A with Ethernet function
RS-485
communication address = 01
RS-485 communication RS-485 communication
address = 02 address = 03
UTAdvanced Series
(1) The host compiter sends the command to read the
process data from the serial devices through the
UT75A/UT55A/UT35A/UP55A/UP35A.
(2) The UT75A/UT55A/UT35A/UP55A/UP35A sends
the command to the serial devices using the
Ethernet-serial gateway function.
(3) The serial devices return the process data.
(4) The UT75A/UT55AUT/35A/UP55A/UP35A sends
the received process data to the host computer
using the Ethernet-serial gateway function.
RS-485 communication RS-485 communication
address = 04 address = 05
(1) The host computer sends the command to read the
process data from the serial devices through the
UT75A/UT55A/UT35A/UP55A/UP35A.
(2) The UT75A/UT55A/UT35A/UP55A/UP35A returns
the process data of the serial devices stored in the
UT75A/UT55A/UT35A/UP55A/UP35A to the host
computer.
RS-485 communication
RS-485 communication RS-485 communication
address = 04 address = 05
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