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pointers and subroutines

9/10/2011 5:48 PM	Rate (0)
Zangetsu Posts: 22 Rating: (0)	Dear All, I'm working on a project regarding compact water treatment plant and in my company wants to make this program as a template for future projects. I'm using S7-200 system (CPU 226) and I've 19 motors in this project and 29 solenoid valves, so i was asked to make a subroutine for motor and another one for valves, and call these 2 subroutines whenever needed in the main program.\ i did so, but whenever i try to operate more than 1 equipment (motor or valve) in the same time, i get wrong excusion and wrong outputs, after a while, i knew that i'm writing 2 different data on same local variable and it makes confliction. some one told me to use pointers in subroutines and it'll work. i kept looking in S7-200 system manual, but it doesn't show how to make it, and i knew that the lowest form i can use in a pointer is Byte, now i don't know how to use it to control certain bits. Attachement: sample program for motor control + motor control lib Thank you in advance. Regards Ahmed Attachment Motor.zip (536 Downloads)
Zangetsu Posts: 22 Rating: (0)
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9/10/2011 9:57 PM	Rate (0)
Marcjan Diamond Member Joined: 4/22/2010 Last visit: 3/31/2025 Posts: 5697 Rating: (716)	Hello, I have no Microwin at this computer but i think i know what's going wrong. You have to keep all the things tha needs a memory, like timers out of the SBR, use the In-out to do so. M-bits you have to do the same with. ~~When i have my pc with microwin at hand i'll have a look at your program~~. did have a look at it, make the set reset functions of the type in-out and us different memory bits each time you call the function. Regards, Marcjan
	Last edited by: Marcjan at: 9/10/2011 10:12 PM Problem solved? Please let us know! Please no technical questions by PM, use the forum sections for your questions.
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9/11/2011 7:12 AM	Rate (0)
Zangetsu Posts: 22 Rating: (0)	Marcjan, thank you for your reply. I'm already not using anything that uses a memory (timers, counters..etc) i need you to explain more about this, so i'll send you the program as a *.pdf file maybe you can help me more with it. thanks in advance. Ahmed Attachment Motor control.pdf (620 Downloads)
Zangetsu Posts: 22 Rating: (0)
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9/12/2011 7:11 AM	Rate (0)
Marcjan Diamond Member Joined: 4/22/2010 Last visit: 3/31/2025 Posts: 5697 Rating: (716)	Hello, When you use set/reset instructions in a SBR, the variable must be off the type in_out. See attached picture. Regards, Marcjan Attachment set-in-sbr.JPG (413 Downloads)
	Problem solved? Please let us know! Please no technical questions by PM, use the forum sections for your questions.
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9/13/2011 10:20 AM	Rate (0)
Zangetsu Posts: 22 Rating: (0)	Dear Marcjan, Thank you for your clarification and i really appreciate your effort. it worked well and i can now proceed with the programming. Thank you Ahmed
Zangetsu Posts: 22 Rating: (0)
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This contribution was helpful to 2 thankful Users O_Moderator Marcjan

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