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  1. Ladder to Functional Block

    Hi frnz, I need some tips to convert Modicon ladder program to functional block diagram. Notes:1.Logic of the program unknown. 2.Total 130 networks Thanks Hema
  2. 3 It has been decided to introduce a Programmable Controller into a manufacturing plant to control a three phase induction motor via an autotransformer in order to reduce high starting currents. It is required to include an alarm circuit which is to give an audible and visual alarm when the motor is overloaded. A momentary actuated Reset push button is to be included in the alarm circuit which will turn off the audible alarm but leave the overload lamp on until the motor overload is reset. Once the motor overload is reset the overload lamp is to be de-activated. The conventional relay circuit diagram for this starter is shown below. A single Stop/Start push button control station is required to initiate the following motor control sequence. a. Motor 1 turns on the instant the start push button is operated; b. Motor 2 turns on 10 seconds after Motor 1 starts; c. Motor 3 turns on 15 seconds after Motor 2 starts; d. Motor 3 turns off after running for six seconds; e. Motor 2 turns off 6 seconds after Motor 3 stops; f. Motor 1 turns off 3 seconds after Motor 2 stops. If the Stop push button is operated, or a thermal overload from any motor is tripped, the whole system will shut down. Motor 1 will start the control sequence again next time the Start push button is pressed.
  3. Hello Everyone, I am new to ladder logic, and trying to understand flow of below attached ladder logic- How does the program flow ? Does PT4601_I in rung 3 waits for rung 2 to complete inorder to consider updated value of PT4601_I or it consider PT4601_I default value and runs simultaneously with rung 2 ? Thank you in advacne
  4. Version

    1453 downloads

    This is a quick bit of code to show how a recipe function might be written if one were to do it in the PLC rather than the HMI. This is the basic building blocks with which a program could begin to be written. The BSET instruction combined with the indirect addressing method demonstrated would allow for a delete function. Copy and other functionality could be added using similar concepts.
  5. File Name: Recipe Sample Code - Ladder program with supporting NB project File Submitter: Michael Walsh File Submitted: 31 Mar 2015 File Category: PLC Sample Code This is a quick bit of code to show how a recipe function might be written if one were to do it in the PLC rather than the HMI. This is the basic building blocks with which a program could begin to be written. The BSET instruction combined with the indirect addressing method demonstrated would allow for a delete function. Copy and other functionality could be added using similar concepts. Click here to download this file
  6. Is it possible to make the ladder logic display the name, address and comment? If so how can i do this? Thank you, Mike
  7. GX Developer

    hello, I have just joined Mr PLC so apologies if my question is answered elsewhere that I ought to have seen. I have just started to learn GX Developer and have produced a basic ladder diagram with just six rungs. When I print it A4 the result is far too small meaning any text cannot be read. I can find no way of making it print "fit the page" Can anyone advise me? Roger
  8. I'm just starting to learn Ladder Logic Programming. I'm using Allen Bradley RSLogix 5000. I've been tasked with developing a 'Simple' Coffee Machine which operates like so: Toggle Push Button to StartDrop Cup (for 10 seconds)Feed Hot Water (for 10 seconds)If required, Add Milk (for 10 seconds)If required, Add Sugar (for 10 seconds)Procedure Complete - Illuminate Complete Light (for 10 seconds)I have implemented everything except the OPTIONAL add Milk & OPTIONAL add Sugar. Options are: To have a Coffee without either Milk or Sugar.Or have a Coffee with Milk and Not Sugar.Or have a Coffee with Sugar & Not Milk.Or have a Coffee with BOTH Sugar & Milk. I'm considering using Toggle Buttons to select / jump to a Subroutine (choosing the required ingredient make-up). But I'm wondering if there is another way to sequentially go through the procedure? Thanks. http://stackoverflow.com/questions/26930902/ladder-logic-simple-coffee-machine-optional-add-milk-add-sugar?noredirect=1#comment42839041_26930902