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Implementaing a Case decission in PCS 7

Created by: Ambrose at: 10/14/2010 3:08 PM (3 Replies)

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10/14/2010 3:08 PM	Rate (0)
Ambrose Posts: 11 Rating: (0)	Hi guys, Am pretty new to PCS 7 actually the whole Siemens stuff. I really need some help here. I want to implement a simple calculator that takes in 2 arbituary numbers. Depending on the Choice i make, the numbers ar either added, subtructed, divided or multiplied The result is 1 out put. In the text base languages I would obviously use a decission such as "If....elseif....else end if" or "Case x=1.....X=2.....and so on" Please give some ideas on how to go about this. Any help wil be apprieciated
Ambrose Posts: 11 Rating: (0)
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10/14/2010 4:12 PM	Rate (0)
dchartier Grandmaster Joined: 9/27/2006 Last visit: 12/26/2024 Posts: 12314 Rating: (2695)	Hello Ambrose; The easiest language to do this is SCL, a prgramming language that ressembles PASCAL. And since you are using PCS 7, you must have a license for it on your Engineering Station, so you might as well use it. S7-SCL manual:http://support.automation.siemens.com/WW/view/en/5581793 *12.2.1 Overview of Control Statements* *Selective Statements* A selective statement enables you to direct program execution into alternative sequences of statements. *Types of Branch Function* IF Statement: The IF statement enables you to direct program execution into one of two alternative branches depending on a condition being TRUE or FALSE. CASE Statement The CASE statement enables you direct program execution into 1 of n alternative branches based on the value of a variable. *Loops* You can control loop execution using iteration statements. An iteration statement specifies which parts of a program should be iterated depending on certain conditions. *Types of Branch Function* FOR Statement: Used to repeat a sequence of statements for as long as the control variable remains within the specified value range. WHILE Statement: Used to repeat a sequence of statements while an execution condition continues to be satisfied. REPEAT Statement:Used to repeat a sequence of statements until a terminate condition is met. Hope this helps, Daniel Chartier
	Last edited by: dchartier at: 10/14/2010 4:13 PM
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This contribution was helpful to 1 thankful Users Ambrose

10/14/2010 4:15 PM	Rate (0)
zerepegro Posts: 183 Rating: (8)	Hi Ambrose; With this info i would rather make a block (function block)programmed with SCL. SCL is similar to PASCAL and you can use if-else, select/case, for, while, etc... Take a look at this: http://support.automation.siemens.com/WW/view/en/5581793 Regards
zerepegro Posts: 183 Rating: (8)
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This contribution was helpful to 1 thankful Users Ambrose

3/27/2012 8:01 AM	Rate (0)
Ambrose Posts: 11 Rating: (0)	After a long read through I have got more than I asked for. I can almost do all that I need in PCS7. Thanks Guys.
Ambrose Posts: 11 Rating: (0)
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