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Object-oriented and State-based Programming in Distributed Control System

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1. Object-oriented programming of devices, incl. CTC (Control Technology Corporation)
The real hardware is configured as an object with states (properties), actions (Methods) to achieve state-based operation, diagnostics and metric analysis etc. The control program has two parts (compiled and run-time) and consists of various device objects. The run-time part of control program features the flexible control system. For executing control program, two engines, i.e. Performance Engine and Monitor Engine are needed. See Fig. below.
United States Patent US5950006

2. State based control, like Object-oriented programming, incl. SMI++ framework. Its running mechanism is as below,
SMI TOOLS  for programming SMI objects and  Proxies

The basic action by which the SM can control activities in the experiment is the exchange of messages with the associated processes. The SM may be driven by command messages originated by other processes, called control processes. The use of an interactive control process is the normal way by which an operator can interact with the SM.
STATE MANAGER OVERVIEW

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December 2, 2010 at 3:09 pm

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智能电网带动电子信息产业–控制工程网

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Written by laurence yuyi

November 24, 2010 at 4:53 pm

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陈志武:国企需要一场哲学反思

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南方周末 – 陈志武:国企需要一场哲学反思

陈志武:国企需要一场哲学反思

Written by laurence yuyi

November 23, 2010 at 11:55 am

Posted in Economy

创新中国论坛综述:创新人才培养,箭在弦上,路在何方

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科学网—创新中国论坛综述:创新人才培养,箭在弦上,路在何方

创新中国论坛综述:创新人才培养,箭在弦上,路在何方

Written by laurence yuyi

November 23, 2010 at 9:54 am

Posted in Education

The Mobile Panel 277F IWLAN commisioning

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1. WLAN — With SINEMA E (SIMATIC Network Manager Engineering), SIEMENS offers you
Windows software for planning, simulating and configuring a WLAN.

2. Safety Requirements evaluation — Safety Evaluation Tool

3. Zones (Zone ID) are used for location-dependent control of a plant area

4. An effective range (Effective range ID) is the range in which you perform fail-safe operation of plant parts, e.g. a machine, using the enabling buttons of the mobile panel.

  • Safe operation of the plant part separated by the effective range is possible only after successful logon. 
  • Effective ranges and zones can be configured independently of one another. 

5. If no definition of Zones and Effective Ranges

  • safe operation of plant parts using the mobile panel or automatic screen call are not possible in plants without effective ranges and zones. 
  • the emergency stop button is always active when the mobile panel is integrated in the PROFIsafe communication. 

6. Battery — The battery must always be sufficiently charged. When the battery is empty, a communication error occurs. The F-CPU initiates a “shutdown”.

7. Radio Link — If the radio link quality is too poor, a “global rampdown” is initiated.

8. Range Logon

  • If the F-CPU detects a communication error for a mobile panel that is logged on to the effective range, it initiates an immediate stop of the machines associated with the effective range. 
  • When an operator has logged on to an effective range and leaves this range for more than 25 s without logging off, a “local rampdown” is triggered. 

9. Illuminated sign — When a mobile panel is logged on to an effective range, then this must be indicated via an external indicator, for example a lamp.

10. Effective range quality

  • The “Effective range quality” object indicates how well the Mobile Panel 277F IWLAN is still located in an effective range.
  • The mobile panel calculates the effective range quality from the distance to the assigned transponders

11. Safety Function blocks — For detailed information, select the block in the STEP 7 Editor and press the “F1” key.

12. Integrated into or removed from safety program (F_program) with Mobile HMI

  • Transponder setting
  • Access Point Network setting (SCALANCE W788), SIMATIC Manager
  • F-CPU, Mobile Panel etc. setting, STEP 7–HW Config and Programing
    1. »»»»Add function blocks for 277F Mobile Panel, incl. standard and safety.
    2. »»»»Create F-Runtime group to be called from standard program
    3. »»»»Configure F-program and download
  • Mobile Panel setting (277F IWLAN), Windows CE, WinCC Flexible

13. For a application example, additional devices are needed, incl. ET200S and SCALANCE x208

  • WinCC Flexible is used to create HMI screen

14. Commissioning

  • F-CPU or F-I/O configuration, <S7 Distributed Safety – configuring and programming>
  • Safe program, <S7 Distributed Safety – configuring and programming>
  • Zone acceptance test, WinCC Flexible

15. Application

  • Switch on/off panel
  • Log on/off zones
  • Operate screens
  • Integrate Panel into WLAN with ProfiNet

Written by laurence yuyi

November 11, 2010 at 8:51 pm

Posted in Technology

Siemens Integrated Safety Overview

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From 《Safety Integrated》

Relevant Safety Standards:
Functional safety — functional safety in accordance with EN 62061 or EN ISO 13849-1

  • EN 62061: 2005 – as European sector standard of the basic standard IEC 61508.
  • EN ISO 13849-1: 2006 – as revised successor standard to the EN 954-1

Risk-reducing design principles and risk assessment of the machine — EN ISO 12100-1, EN 1050
Electrical safety — EN 60204-1

The ProfiSafe specifies the safe communication in accordance with:

Written by laurence yuyi

November 9, 2010 at 3:51 pm

Posted in Technology

科学网—科技部回应施一公饶毅《科学》社论

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科学网—科技部回应施一公饶毅《科学》社论

科技部回应施一公饶毅《科学》社论
认为文中所涉我国基础研究科研经费分配问题与事实不符

施一公饶毅联合为《科学》杂志撰写社论
讨论目前中国的科研基金分配体制及科研文化问题
  饶毅,施一公
编者按:施一公是清华大学生命科学学院教授、院长,饶 毅是北京大学生命科学学院教授、院长。近日,两位科学家联合撰文,讨论目前中国的科研基金分配体制及科研文化问题。他们在文章中指出,尽管近年来中国研究 经费持续以20%的比例增长,但这种增长没有对中国的科学和研究起到应有的强大的促进作用,现行的科研基金分配体制甚至在某种程度上阻碍了中国创新能力的 发展。他们认为,目前正是中国打破研究基金管理中各种潜规则、建立健康研究文化的时机,一个简单但重要的起点是所有新的研究基金必须基于学术优劣分配,而 不再依赖私人关系。
 

Written by laurence yuyi

November 9, 2010 at 8:53 am

Posted in Education