PLC Program help needed - ladder

MaxHeadRoom

Joined Jul 18, 2013
20,697
That looks like the small Mitsubishi PLC, Smart Relay style.
Do you have the manuals for it and have you used ladder and that unit before?
Is this for a practical solution? or just a academic question, i.e. Homework?
Max.
 

MaxHeadRoom

Joined Jul 18, 2013
20,697
The first thing is to acquire or make up a list of the potential I/O devices, P.B.s sensors etc. including 3ph contactors and output devices.
Also the Mitusbishi manual you show has a fair bit of instruction.
The first few rungs are usually for system initiate/start & E-stop etc.
Do you have a unit to practice program entry and required software?
I have also used a book by John Ridley on Mitsubishi FX controllers.
I suggest taking a crack at it and post the results, we could always critique it.
If intending to pursue PLC in the future, it will help.
Max.
 

MisterBill2

Joined Jan 23, 2018
6,070
I have written ladder logic programs for quite a few fairly complex production and testing machines. This is certainly a class exercise assignment. For starters, the TS needs to create the ladder performing the basic pumping operations, and then, after verifying that, add the additional requirement functions, including the various timer operations. The flowmeter requirement is actually what is the portion that depends very much on the capability of the specific PLC, since some have a rate function, while other have only a counter function that is speed limited.
AND given the additional BOM requirements, this could be a final exam test. In that case, the TS should have listened more closely in class.
 
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