|One Duty Support
- We Find You Safely How -
Toshiba Mitsubishi-electric industrial systems Co., Ltd.
The labor saving and making work a few operators are promoted
in a recent process industry system for making to the conserve
cost. Doing the work done by two or more operators alone increases
so far, and how worker's safety is secured becomes a problem.
We Built One duty support system equipped with the life sensor
jointly developed with AJINOMOTO Co., Inc. as the solution. We
introduce one duty support system while appropriating the focus
to the development of the life sensor.
Applying Today's PLC to Process Automation Systems
Mitsubishi Electric Corporation, Industrial Products Marketing
Industrial Products Engineering Department
PLCs as a whole are widely used in the process automation industry.
The process control industry has experienced a constant change,
such as downsizing, reduced costs, and standardization, as the
forefront for process control.
This article addresses the issues of how today's PLCs in its
form are applied to process automation systems.
Application of PLC for PA and Future Evolution of
PLC-based Process Controller
OMRON Corporation Analog Controller Division
Some users have utilized the PLC for PA since the first half
of the 1980s; however, it started to be used broadly in late
At the beginning, the PLC-based process controller was used
for only small-scale batch plants. As the introduction records
the application of PLC-based process controller has expanded.
The duplex controller system accelerated the application expansion
and the PLC-based process controller is introduced for continuous
operation plants, these days.
In this writing, I will introduce some concrete application
cases of PLC-based process controller for PA, the evolution concept
of Omron's PLC "Smart Platform", and the concept of PLC-based
process controller "SMARTPROCESS".
The Most Suitable Management and Cost Reduction Measures of Air
Oji Paper Co., Ltd., KUSHIRO Mill
Enlargement of instrumentation machinery of 2000 loops was expected
by large-scale construction from 1999. I accomplished consumption
up of air for instrumentation with this without building more
We had promotion of further cost reduction measure after 2003 and I
started a new action toward reduction of compressors. As a result,
I realized reduction of annual electricity 2 million kWh, quantity
of coolant 77thousand metric ton and got a big energy saving
This paper shows overviews of this action. At the same time,
I introduce valve-positioner developed with SP DEVELOPMENT LABORATORY
CO., LTD. toward vibration-proof structure and stability control,
which played a big role of reducing air consumption.
About a Maintenance Effect of Instrumentation Equipment by Air
Tech Tokai Co., Ltd.
Pulp & paper mill selected DCS instead of old controller
system now, instrumentation equipment also became electronics
However, many pneumatic device still exist, such as a control
valve, a field type controller, and an automatic guide.
This time, we will make a report on "Air leak check of pneumatic
instruments" which was performed by Tech Tokai as a part of energy
conservation activities for two years since April, 2003, from
the view point of effects on preventive maintenance of pneumatic
Operational Record of Paper Sludge Carbonizing Plant with the
Compact PLC Control System
Hokuetsu Paper Mills, Ltd.
The PLC control system has replaced the DCS or the personal
computer DCS in recent years. In this situation the Nagaoka Mill
Paper Mills, Ltd applied the compact PLC control system to the
paper sludge carbonizing plant that had started the test operation
since July, 2003.
This plant was the first one for the maker. We applied the PLC
control system to this plant, because we could change the sequence
and the control easily.
It was the first time for us to install the PLC control system.
This report shows the process of installation and the engineering.
Especially we designed the part of the engineering by our selves
from the first time. Therefore we had a lot of trouble with the
interface between the ladder sequence and the control loop, the
interface between PLC and HMI in comparison with the DCS. This
report also shows the above trouble.
Foundation Fieldbus System Construction by a PC Method
Yufutsu Mill, Nippon Paper Industries Co., Ltd.
It aimed at "Establishment of the Fieldbus that everyone
was able to treat at a low price" last year in July,
and it set it up in the new establishment plant of draining
the anaerobic equipment by the composition "General-purpose
personal computer + Ethernet + Linking Device + Field equipment " without
the adoption case at all at that time. It reports on the development
in the obtained finding and the future, because it was possible
to be in normal operation.
It is Quickly for Investigate the Cause the Trouble by PLC's
Nippon Daishowa Paperboard Tohoku Co., Ltd.
In 1992, NDBTohoku introduced the Voith shoepress due to raise
dehydration up at press part for the first time in Japan. This
press was remodel from import facility, and the control logic
had not established. Therefore we constructed the control logic
with manufacturer (IHI).
But, we complained about analyze the factor of sequence delay,
because of complicate systems and less operation experience.
For speed up of the failure factor analysis, we observed this
shoepress control logic in 2003, using by PLC observation monitor.
Supervisory Improvement by DCS-PLC Integration
Mishima Mill, Daio Paper Corporation
We have renewed the DCS and PLCs for our LKP bleaching & washing
plant which has been running since 1984.
Latest models of DCS have the ability to communicate with PLCs
of various vendors in high speed owing to protocols adopted.
We have integrated the DCS with the PLCs aiming not only operational
improvement, but plant diagnoses through PLCs internal data access
Introduction of PLC Instrumentation and Application Example
Ohnest Co., Ltd.
In the field of process instrumentation and control field,
EI integrated functionality and excelled cost per performance
furnished "PLC instrumentation system" has been expanding
the application field where mid to small DCS traditionally
has been serving.
It is expected that PLC instrumentation system could be deployed rapidly for
environmental satellite control such as utility/waste water control and monitoring
particularly in pulp and paper factories.
We have developed the pH control system to overcome non linear process characteristics
by adding fuzzy control function as an advanced control to PLC instrumentation
system and applying continuous flow pump for the actuator.
We expect that these technologies could be utilized as key for the environment
monitoring/waste water processing system, which are expected to be replaced actively
Toward Optimization/High Promotion of Efficiency of Control Valve
- Control Valve Maintenance Support System "Valstaff" -
Marketing Department, Advanced Automation Company, Yamatake Corporation
Since the operation of control valve has direct influence on
a process, control valve maintenance has the very important role
same with turn apparatuses such as a pump, a turbine, a compressor.
The control valve maintenance is dependent on experience of an
expert. Since the expert's age is high, if technical succession
is not carried out to the next generation, a possibility that
a plant will become unusual will become high. Therefore, the
following is needed, additional data for determining the optimal
maintenance cycle of control valve, the tool for performing a
prompt action when a plant becomes unusual, and the diagnosis
system which can detect failure of control valve before the abnormalities
of a plant occur.
In this report, Control Valve Maintenance Support System "Valstaff" developed
in our company for optimization and high promotion of efficiency
of control valve maintenance is proposed.
Performance Improvement of Consistency Profile Control by the
Latest CD Adaptive Control
Hironobu Maruno and Takashi Sasaki
P&W Solution Dept., Industrial Automation Systems Business
Yokogawa Electric Corporation
In this paper, we introduce the concept of consistency profile
control in B/M9000CS. It is composed of mainly the following
four parts. 1) Virtual actuator corresponding optimizing control.
2) Model predictive control. 3) Auto tuning tool. 4) CD adaptive
control. Especially, CD adaptive control has succeeded to realize
world first fully automated identification of mapping. CD adaptive
control constantly and automatically executes analysis and adjustment
of mapping during profile control.
Water Vapor Transmission Behavior through Porous and Dense Enthalpy
Exchange Sheets Treated with CaCl2, LiCl and Colloidal Silica
Bong-Yeol Yeom and Byoung-Ryul Min
Department of chemical engineering, Yonsei University, Seoul,
This report is concerning the sheet to be utilized to the air-to-air
heat exchanger. Observation on the characters of the moisture
permeation for two types of the enthalpy sheet (porous and dense
enthalpy sheets) has been conducted. To improve the efficiency
of the moisture permeation through the enthalpy sheet, the moisture
absorbents CaCl2, LiCl and colloidal silica have been used. Throughout
the wet cup test according to the ASTM standards, the tests of
the moisture permeation according to the changes of the air gap
have been conducted. For both of the porous and dense enthalpy
sheets, it showed 2 to 2.5 times of increase for the permeability
of water vapor when the air gap reduced from 13 mm to 6 mm. Also,
according to the treatment of the moisture absorbent, the permeability
of water vapor increased, but after the certain amount of the
processing no further increase of the permeability was shown.
For the dense enthalpy sheet compared with the porous enthalpy
sheet, it showed more increase of permeability of water vapor
due to the moisture absorbent and also it was seen that the dense
enthalpy sheet has the similar permeability of water vapor to
the porous enthalpy sheet’s when processing the moisture absorbent.
Keywords: air-to-air heat exchanger, enthalpy sheet, wet cup
test, air gap, permeability, moisture absorbent