#12 2012

CONTENTS №12

Discussing a Topic…

Data communication media

Introduction

Aristova N.I.  Once again about industrial networks

The paper briefly overviews network standards most popular at Russian plant floor: Profibus DP/PA, CANopen, DeviceNet, SDS, Interbus-S, AS-Interface, Modbus, СС-Link, FOUNDATION Fieldbus, and HART. Performance data, merits and drawbacks, and application fields are discussed.

Keywords: network standards, industrial network, data transfer rate, openness, twisted pair, optical fiber.

Lopukhov I.V.  Industrial network media and protocols

Merits and drawbacks of data communication environments are examined. Principle Ethernet standards for optical and copper media are listed, a new wireless communication standard is discussed. The challenges of Ethernet application in real-time industrial networks are briefly overviewed.

Keywords: wireless communication, Ethernet, protocol, data communication medium, switch, extender, point of presence, real time, speed.

Kukharenko S.Yu.  Industrial Ethernet communication protocols and interfaces in SIMATIC S7 controllers

Standard and custom specialized protocols, functions and services used by SIMATIC S7 controllers for data exchange organization via Industrial Ethernet are listed. Embedded Industrial Ethernet interfaces of S7’s CPUs and communication processors are examined.

Keywords: communication protocol, Industrial Ethernet, CPU, data exchange, controllers, communication processors.

Ethernet and the determinism

When Ethernet is compared with other universally recognized deterministic industrial field buses, much is disputed about its determinism. An opinion exists that Ethernet-based industrial systems are nondeterministic as against other specialized buses. The paper shows that Ethernet is really deterministic under certain conditions.

Keywords: Ethernet, determinism, industrial buses, duplex mode, block message filtering, distributed I/O system, PLC, token passing.

Kryukov O.V.  Ethernet data communication medium at field level

The advantages of today’s Ethernet networks and the features of their hardware implementation in various process control systems are discussed. Examples of implemented projects with industrial Ethernet systems are included with network structure variants.

Keywords: control system, data communication, communication systems, Ethernet.

Baskakov S.S.  Telemetry system design on the basis wireless sensor networks

The paper describes ML-SM wireless monitoring system, shows its key features and advantages and overviews various application areas. With the example of ML-SM it demonstrates the opportunities of wireless telemetry system design on the basis of wireless sensor networks and discusses their key constraints that should be allowed for in the design of such type wireless data acquisition systems.

Keywords: wireless sensor networks, wireless sensors, telemetry monitoring and distributed data acquisition system.

Yamanov A.D., Alevsky D.A., Plekhanov E.E.  ZigBee wireless local networks for automated control systems

The paper examines the cases of cabling rejection in favor of local wireless data communication networks in automated control systems. The interfacing of wireless channels with automated control systems and the control terminal are discussed with the example of Analytic Telecomsystems’ solutions.

Keywords: ZigBee, modem, wireless communication, automation, system, control, data communication.

Reliable information medium

Ha-VIS RFID transponders developed by HARTING Technology Group make it possible to send continuous information flow directly to process’s field devices.

Keywords: RFID transponders, process, industrial applications.

Barbot A.V.  DALI – the art of light management

The paper discusses DALI: the modern digital indoor lighting control system. Its structural diagram, the concept of groups and scenes, commands, dimmer curve, equipment overview, devices and network configuring are included.

Keywords: RFID digital lighting control technology, building, energy efficiency, dimmer curve, automated control system.

Turutin A.A.  Automation of data communication in industrial gas accounting

Industrial gas measuring instruments from Elster Gaselectronics are presented. Communication solutions intended for automated systems of data acquisition from gas accounting complexes are considered. Functionalities of SODEK, a universal software tool for Elster Gaselectronics equipment, are discussed.

Keywords: gas accounting units, automatic data acquisition system, communication tools, modem, functional block, gage points.

Naghiev A.G., Khalilov S.A., Agaev U.Kh., Guseinova A.S.  A self-adjusting indirect measurement system for pneumatic catalyst transport velocity in reactor/regenerator systems of chemical industry

The paper offers a design technique for a system of catalyst circulation velocity monitoring self-tuning calibration at process units with circulating fine-dyspersated catalyst. It shows that reliable self-adjustment can be ensured if a self-learning data sample describing the dynamics of catalyst distribution between reactor and regenerator is collected continuously.

Keywords: self-adjusting system, automation of reactor/regenerator units, indirect measurement, catalyst circulation rate.

Agamalov Yu.R.  New automation capabilities for digital instrument checking and calibration

The paper analyzes the state of the art in the filed of electrical quantity meters’ calibration. It discusses the opportunities of calibration procedure automation for digital instruments using a new approach based on self-calibration concept. The benefits of the approach application in instrument manufacturing and operation is estimated.

Keywords: virtual instrument, checking, calibration, automation, efficiency, self-calibration.

Events

Kharazov V.G.  News from Automation 2012 exhibition

Novel offerings to Automation 2012 exhibition are briefly overviewed.

Keywords: automation, controllers, transducers, drives, UPS, sensors, regulatory controllers.

Journal’s Club

Traversing the peaks of system identification theory – To the anniversary of V.M. Chadeev