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Basic PLC Ladder Programming Examples 20 Basic PLC Ladder Programming Training Examples for Beginners.  Hi friends, here we are starting unique a series of Free Training on PLC Ladder Programming & tutorials. These PLC Ladder Programs are important to learn basics of Ladder programs.   PLC Ladder Practice Problem:  Summation of Continuous D Registers ·        Summing up the values of D registers from D101 to DN (the number of N is determined by users) and storing the operation result in D100. If the result < K-32768, the borrow flag = ON; if the result > K32767, the carry flag = ON           Topics Covered in this example is FOR NEXT PLC instructions of Ladder Program. Number of PLC Outputs Required Y0 Borrow flag indicator. When the value in D100 < K-32768, Y0 = ON Y1 Carry flag indicator. When the value in D100 > K32767, Y1 = ON Number of PLC Data Registers Required D100 Stor...

Following are the Free PLC Software's available from all leading brands such as Allen Bradley,Siemens,Omron,Mitsubishi,Schneider,GE,ABB,Keyence,Unitronics,    Siemens Software Free LOGO, S7-200, S7-300, S7-400 and S7-1200 Software. Step7 Micro/Win PLC’s supported are S7-200 PLCs Note: 60 days Trial, Fully functional. Step7 Lite PLC’s supported are S7-300 PLCs Note: 300 Steps limited functionality. Step 7 Professional Trial Software PLC’s supported are S7-300, S7-400 and S7-1200 PLCs Note: Demo version LOGO Soft Demo Version PLC’s supported are LOGO Programmable Relays Note: Simulation only, No download/upload from/to PLC ALLEN BRADLEY FREE SOFTWARE Free CompactLogix, ControlLogix, MicroLogix and Pico Software. RS Logix 5000 PLC’s supported are CompactLogix and ControlLogix PACs Note: 90 days Trial. RSLogix Micro Starter Lite: PLC’s supported are MicroLogix 1000 or 1100 PLCs Restrictions: Starter Version. Pico Soft: PLC’s supported are Pico Programmable Relays Restrictions: Ful...

Trial Run of Delta PLC Before Starting the Trial Run of Delta PLC anyone should check following things Power Indication of Delta PLC 1. At the front of the MPU or the expansion unit, there is a “POWER” LED. When the MPU is powered ON, the LED (in green) will be ON. If the indicator is not on when the MPU is powered up, it means there is problem that DC power supplies to PLC. Thus, it is important to check whether the wiring of +24V and 0V are properly conducted. If ERROR LED is blinking swiftly, it means +24VDC does not supply enough power to delta PLC. 2. If the other indicator, “L. V”, that locates at the front of the extension unit is on, it means that the input power voltage to the extension unit is insufficient, and the output from the extension unit should be prohibited. Preparation 1. Make sure that the power wiring and the I/O wiring are both conducted properly before the power ON. Please ensure NOT supply AC110V or AC220V to the I/O terminals, or the wiring might be short cir...

Before the advent of solid-state logic circuits, logical control systems were designed and built exclusively around electromechanical relays. Relays are far from obsolete in modern design, but have been replaced in many of their former roles as logic-level control devices, relegated most often to those applications demanding high current and/or high voltage switching. Systems and processes requiring “on/off” control abound in modern commerce and industry, but such control systems are rarely built from either electromechanical relays or discrete logic gates. Instead, digital computers fill the need, which may be programmed to do a variety of logical functions. In the late 1960’s an American company named Bedford Associates released a computing device they called the MODICON . As an acronym, it meant Mod ular Di gital Con troller, and later became the name of a company division devoted to the design, manufacture, and sale of these special-purpose control computers. Other engineering ...

PLC SCADA DCS Interview Questions and Answers 3 PLC Interview Questions and Answers SCADA Interview Questions and Answers DCS Interview Questions and Answers Friends this the most awaited post I am writing for all the freasher in the field of Automation and those are looking for job and preparing for interviews. It is difficult to find the PLC interview questions and answers If you like the post Please like our FB page ,Do comment, and Share. So here we go. Question:Give some applications of DCS Answer:  a. Thermal Power Plant b. Oil and gas (extraction, production and storage) c. Energy generation (and waste incineration) d. Water and the environment (production and purification) e. Chemical industry f. Paper and cement. Question: Mention some of the DCS manufacturers Answer: a. ASEA BROWN BOWERI - ABB b. TATA HONEYWEL c. FOXBORO - INVENSYS d. YOKOGOWA BLUE STAR - YBL e. ALLEN BRADLEY f. GE FANUC g. FISHER ROSEMOUNT   h. TOSHIBA Question:What are the factors to be conside...