Analog Ladder Logic Programming

3 comments

Rate

tawanda Active Contributor Join Date: Apr 2012 Posts: 22	Analog Ladder Logic Programming 03/26/2013 4:17 AM
	i hav just recently aquired a S7 1200 plc, CPU 1214C. Am new to programming and i need to monitor silo levels of a plant.The instrument i am using sends a signal 0-10V to the PLC. I have no trouble with digital ladder logic creation but analogue is giving a hard time.Please i need help or any reference were i can get information. Wat i no is sensor signal is Real,and i need to convert it to word then i need to scale it.
	Register to Reply
	Pathfinder Tags: analog

Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

These comments received enough positive votes to make them "good answers".

PWSlack Guru Join Date: Jan 2007 Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on. Posts: 32175 Good Answers: 839	#1 Re: analog ladder logic programming 03/26/2013 4:21 AM
	OK, so look for the scaling function block in the list of available functions. __________________ "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
	Register to Reply

Yahlasit Guru Join Date: Dec 2008 Location: Cd. Juarez, Chihuahua, Mexico. Posts: 1023 Good Answers: 69	#2 Re: Analog Ladder Logic Programming 03/26/2013 9:15 AM
	Your analog module converts the signal into a binary word, but you need to know the address of that word. Upload the hardware configuration from your PLC to your PC and open that file, write down all of the registers (memory locations) used by the analog module, so you know where to find the relevant data. Open the HELP menu and display the instruction set for analog modules, there should be one called "scale" or something like that, take note of the addresses used by the instruction, so you fill those fields with the relevant data. The rest is just a matter of data moving, arithmetic operations and/or comparissons. Regards __________________ No hay conocimiento ni herramienta que sustituya al sentido comun.
	Register to Reply Good Answer (Score 2)

67model Guru Join Date: Dec 2010 Posts: 1686 Good Answers: 116	#3 Re: Analog Ladder Logic Programming 04/04/2013 11:33 AM
	Looking at Siemen's website found after Google for "Siemens S7 PLC". https://support.automation.siemens.com/WW/llisapi.dll?func=cslib.csinfo&lang=en&objID=34612486&subtype=133300 and looking for "manuals" for S7 got me the above web page. Downloading the "s71200_easy_book..." document and looking through got to 6.3.3 "Conversion Instructions" data type to data type. There is a "Getting started" manual and probably somewhere a "Programming Guide". Good Luck
	Register to Reply

These comments received enough positive votes to make them "good answers".

Copy to Clipboard

67model (1); PWSlack (1); Yahlasit (1)

	Got Something to Say?
	Ask a Question Start a Discussion

	Aerospace
	BioMech & BioMed
	Chemical & Material Science
	Civil Engineering
	Communications & Electronics
	Education and Engineering Careers
	Electrical Engineering
	General Discussion
	Instrumentation
	Manufacturing
	Mechanical Engineering
	New Technologies & Research
	Software & Programming
	Sustainable Engineering
	Transportation

	Site Directories
	Forum Directory Blog Directory User Group Directory RSS Feeds CR4 Rules of Conduct CR4 FAQ Site Glossary Who's Online (94 right now) Show Members