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Please help me by checking if my program is correct or giving the correct ladder program. I keep getting "Invalid input. - input required but omitted" this error for all the variables in first rung. I'm a newbie to ladder programming and done this much on what I understood by reading different sites on begginer ladder programs.

It would be also helpful if anyone could suggest me any source for learning the ladder programming (ones with many programs with both the problem statement & ladder program for each question).

Automatic Bottle Filling System

Automatic Bottle filling System Problem Logic

Step Conditions:

  1. Start and Stop PB is used to start and stop the process.
  2. Start is pressed Conveyor starts moving until the Proximity Sensor is ON.
  3. Then solenoid valve is open for 5 seconds. After 5s Conveyor should start moving.
  4. Process should continue still stop push button pressed.

Software used:

SoftMaster Version 3.64 05/22/2012

Copyright @ 2005 Honeywell

Link to software user manual: https://www.honeywellprocess.com/library/support/Public/Documents/ug-soft-master-200.pdf

Program Screenshots:

Screenshot of entire window along with ladder program

Screenshot of entire window along with ladder program

Screenshot of list of variables used Screenshot of list of variables used

Screenshot of ladder program only

Screenshot of ladder program only

  • Check your proximity_s symbol. Also once the proximity sensor opens there is no way to restart the system other then the start button. – Gil Jun 30 '21 at 19:48

2 Answers2

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enter image description here

Figure 1. You seem to be trying to write to an input.

If you have defined Proximity_Sensor as an input then you can't write to it. (I'm not familiar with the software so I don't know what address P00002 means.)

Try this:

enter image description here

Figure 2. A possible solution. Image generated using PLC fiddle.

Transistor
  • 168,990
  • 12
  • 186
  • 385
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This specific error was because I didn't connect the OR'ed Conveyor_Motor switch directly to supply of ladder like in the image below:

enter image description here

This small change removed this error.