Taweepol Suesut

PID Controller Design using Characteristic Ratio Assignment Method for Coupled-Tank Process

This paper presents the PID controller design for coupled-tank process using characteristic ratio assignment (CRA). The coupled-tank process is a challenge plant for testing the performance of PID controller because it is a high uncertainty nonlinear model. For this paper, the characteristic ratio assignment (CRA) which is satisfied specification of performance of control system. Furthermore, it is very convenient as a fast adjustment damping ratio as well as a high speed response. Finally, the simulation results can be illustrated the validity of our approach by MATLAB

Design of PLC networks using remote I/O module based on controller area network

The design of the networks system through a controller area network (CAN) bus is presented. To distribute the control points with a long distance and located for the application to on-off electrical equipment by the remote I/O module. The controlling and communication between the programmable logic controller (PLC) and the remote I/O modules are used by the CAN bus serial communication. The experiment has been set up with the maximum of 32 remote I/O modules. Each remote I/Os are linked to the host PLC programmed for handling an interrupt request from any remote I/O independently. Therefore, the scanning time of the controller is not affected. By using this technique, the controller (PLC) can be efficiently applied to several hundred meters.

Interpretation Petri net model to IEC 1131-3: LD for programmable logic controller

Programmable logic controllers (PLCs) are widely used in industry. Thus PLCs usually use the IEC 1131-3 standard programming language. The ladder diagram is the most popular language which does not require a lot of the steps and sequences of the operation. Therefore it is difficult to understand the program structure and developing the system. The Petri net is a graphical model that can explain the system operation easily and clearly. This paper presents the transformation structures from Petri nets to ladder diagram and possible implementation to control the process through the PLCs input and output.

Multi level contract net protocol based on holonic manufacturing system implement to industrial networks

This paper presents a flexible manufacturing system (FMS) that cooperated with the holonic manufacturing system (HMS) with automatic material handling devices via industrial networks. The HMS is described as an intelligent manufacturing system that employs multi-agent system with negotiation protocols. The traditional HMSs negotiation protocol usually used the contract net protocol (CPN) and multi-level contract net protocol (MCPN). This paper develops a cooperative system that applies the concept of HMS to implement a distributed control system for automatic warehouse and FMS. Results from simulation indicated that our approach is able to improve the overall system flexibility. The system is able to reconfigure the re-order points, increase the system fault tolerances, and provide the dynamic rescheduling.

Demand forecasting approach inventory control for warehouse automation

This paper presents a technique to control the inventory level on the warehouse automation by using continuous reviewing and forecasting system. The product demand that stored in the warehouse depends on orders from customers. For each product, the demand follows a Poisson process and the delivery lead-time is known. The demand forecast can predict the trend of order and redefine the reorder point (RP) of inventory that linked to automatic warehouse control system. The automatic warehouse plays an important role in the computer integration manufacturing system (CIMS). The functions of CIMS include production planning, material requirement planning, work order generation, process control, quality control, shipping planning, warehouse and inventory management and material cost accounting. This paper focuses on implementing an automatic warehouse control and inventory management demand forecasting system.

Implementation Programmable Logic Controller for THAILAND Industries

This paper presents a design of programmable logic controllers that can be used in manufacturing automation and process control systems. Most of controllers have been import from oversea. This research focuses on PLC local development by KMITL. The PLC system consists of CPU unit, digital I/O RTU unit and analog RTU unit. The experimental model is used to measure PLC scan time. The result can let us know controller performance to be applied in appropriate scale of plant in the manufacturing automation. In this article, there are many benefits to industries especially to support SME that can use local technology

Adjustable energy control with ICBRM technique

This paper presents a control method for single-phase and three-phase AC voltage supply by mean of ICBRM variable energy control technique which provides suitable power supply feeding to load requirements, and also, improve the feeding efficiency resulting in increased energy saving. The Integral Cycle Binary Rate Modulation (ICBRM) signals are integral cycle compositions of 8-bit binary rate multiplier (BRM) and 50 Hz, three-phase AC voltage signals which are divided into 8 parts per cycle, so that 2040 patterns are provided for the single-phase and three-phase feeding applications. Experimental results shows that such methods can be properly implemented for lighting bulbs and three-phase induction motor with low energy loss. This mean that the technique provides high efficiency performance and conducts energy saving.

A design neurofuzzy controller for level process control

This paper presents the design and implementation of a self-organizing neurofuzzy controller for tuning the fuzzy logic parameter using back-propagation neural network. The controller is implemented by software on a microcomputer to control the unknown transfer function system of a real plant for testing the learning efficiency of self-organization and proper parameter tuning where the scaling factor (g/sub 0/, g/sub 1/) is set from an experiment corresponding with process characterization and the designer experience. The results show that the performance of this controller is improved in terms of the set point compared with the PID standard controller.

New technique controlling of 4-quadrant DC motor drive

The 4-quadrant DC motor drive control considered the technique of BRM is proposed on the expectation of fast response. Power and torque control are imposed on both no load and loaded condition. The outcome response time is less than 1 second, when the resolution of input energy supply is 255 waveforms with scan time of 0.667 milliseconds. The ripple is less than 1%. The control condition of 4-quadrant are operated in quadrant I and IV for forward and reverse rotation and quadrant II and III are for sudden regenerative braking, which resulted in giving reversing time of less than 3 seconds.

VOLUME ESTIMATION OF SYMMETRICAL OBJECT USING LASER LIGHT SECTIONING

This paper presents a method to estimate volume from three-dimensional characteristics of symmetrical objects by computer vision system using laser light sectioning. The camera captures the image of laser line projected on the object moving on a conveyor. The captured images can be estimated the widths and heights at various locations along the object. The area of cross section can be integrated to be volume of the object. The image data is extracted from the structured laser light projecting on the surface. After image pre-processing, the laser profile is calculated the center of gravity in order to extract the image coordinate. The homography transformation is used to transform the extracted coordinate to the real world distance (in metric system). A metric vision based on light sectioning for estimating the volume of symmetrical shapes (rectangular shape and circular shape) of the object were tested. The accuracy of estimation can apply in the automatic size grading on the conveyer as well.