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I have trouble with FC when proramming PLC S7 1200 CPU 1214C !

Created by: xuanphu at: 3/21/2014 4:59 AM (7 Replies)

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3/21/2014 4:59 AM	Rate (0)
xuanphu Posts: 146 Rating: (0)	When I write a program for My CPU 1214C..In my FC block ..i just write a simple program to ON/OFF...2 motor...but there was some pronlem happen ..i dont know why : 1/ When I drag and drop my FC1 (ON: I0.0; OFF: I0.1..Run : Q0.0: ) to OB1 ..if just one FC1 to start first motor ...Dont anything happen ..But I continue to drag and drop my FC1 FC1 (ON: I0.2; OFF: I0.3..Run : Q0.1: ) for starting second motor ....when I press I0.0 ....both motor are running...I dont know why..please help me to ficx this problem ! 2/ With that FC ..could I make HMI inside FC ( On : I0.0 and M0.0; OFF : I0.2 and M0,1) ..Or I have to make them in OB1 ? 3/ Please help me how to use FB and DB block (please make me some sample about them..) Thank you very mcuh !
xuanphu Posts: 146 Rating: (0)
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3/21/2014 11:05 AM	Rate (0)
Denilson Pegaia Platinum Expert Joined: 9/23/2005 Last visit: 11/4/2024 Posts: 4351 Rating: (1452)	Hi, 1) please attach in your post a print (PDF) of your block and the block calls. 2 / 3) FB has his headear variables (in, out, inout and stat) "mirred" in a DB. It is a esay way to HMI access the block, dirrect to an header variable.
	Denilson Pegaia Siemens Industry Sector Technical Support
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3/22/2014 7:43 PM	Rate (0)
xuanphu Posts: 146 Rating: (0)	Thank you for reply ..sir ! This is my PDF witn block creating and Insert block to OB1 ! Just one block insert..nothing happen..but both block inserted ..when press I 0.o ..both Q0.0 and Q0.1 are running ! Attachment FC1.pdf (365 Downloads)
xuanphu Posts: 146 Rating: (0)
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3/23/2014 12:49 AM	Rate (0)
Jorsal Posts: 74 Rating: (31)	Hi Xuanphu, Here is an example TIA V12 project with you pump control. It is zipped, as Siemens Forum won't allow .zap12 file types - doh! See my other post for further description. Attachment FB_example.zip (317 Downloads)
Jorsal Posts: 74 Rating: (31)
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3/23/2014 1:05 AM	Rate (1)
Jorsal Posts: 74 Rating: (31)	xuanphu When I write a program for My CPU 1214C..In my FC block ..i just write a simple program to ON/OFF...2 motor...but there was some pronlem happen ..i dont know why : ...when I press I0.0 ....both motor are running...I dont know why..please help me to ficx this problem ! Hmm, it took me a while to understand why. But you are doint something very dangerous! You are trying to use your Temp variable TermRunto remember the state of the motor. You should NEVER use a Temp variable to remember anything from last time the block was called. Temp Variables may only be used immediately in the same scan as they are actively set to a defined state. The TEMP area is shared between all functions called. The problem is, that when a block is called (no matter if it is a FC or FB), the TEMP area is in a undefined state, as the memory might have been used by other program blocks in the meantime. You MIGHT be "lucky" that you get something to work, but suddently it will stop working or work unexpected, when the same bits has been written to from somewhere else. And that is what you are seeing here, and why you somehow can get something to work when calling the block 2 times after each other - but as you have realized, the functions are "magically" getting connected now for you. Anyway, I fall into this mistake once in a while when I'm programming as well...with a lot of headaches to follow trying to debug what's happening to my program... xuanphu 2/ With that FC ..could I make HMI inside FC ( On : I0.0 and M0.0; OFF : I0.2 and M0,1) ..Or I have to make them in OB1 ? Yes - see my example - I think it answers it. xuanphu 3/ Please help me how to use FB and DB block (please make me some sample about them..) See the attached PDF for a description of my sample project I have created for you. Attachment FB_Example.pdf (330 Downloads)
Jorsal Posts: 74 Rating: (31)
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3/23/2014 6:10 AM	Rate (0)
xuanphu Posts: 146 Rating: (0)	Helle ..Sir Jorsal ! How can I say ! Thank you very much ! Thank you for your detail instruction ! Today I'm very lucky... now..I learn and knew more : how can to work with FB, FC block ...with me ... till now I just study in myself about PLC 200 and S7 1200 without any course training about automation and PLC ..when I began to make a small project for my company ... I bought 2 CPU S7 200( 224) and S7 1200 (1214C, 1215C), two MM420 and other accessories to make my project. Your instruction was very helpful for me to do it ! Please allow me to upload your imstruction to some my friend ! - So i want to put one set 1215C at the second pump feed water pump..This CPU will read analog values from Pressure sensors and send the signal to drive the MM420..for basic pump...other ouput of this CPU just control ON/OFF other pumps! - With 1214C I will put at primary water pump station ...to control 3 pump .. Both CPU will commnicate via Ethernet (I'm thinking about using VPN configutaion)...and display on Winccflexible.. Could you make for me soemadvice and method to make it ? Thank you very much again ! ...Sorry with a small trouble : I couldn't open your FB_example.zap12 file...
xuanphu Posts: 146 Rating: (0)
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3/23/2014 6:43 AM	Rate (0)
Jorsal Posts: 74 Rating: (31)	Yes you coul make a VPN connection between the two sites. I am not totally sure what you want to do. If you want to let the two cpus exchange data so they can start each others pumps, then you might have a look at this : http://support.automation.siemens.com/WW/view/en/39040038 Regarding opening the Zap12 file : What version of TIA are you using? Mine is V12 SP1 upd4. If yours are older you might not be able to open it.
Jorsal Posts: 74 Rating: (31)
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3/23/2014 6:49 AM	Rate (0)
Jorsal Posts: 74 Rating: (31)	Regarding the Zap12 file again: Did you actually try to retrieve it from within tia by selecting the Project menu, Retrieve? There is a lot of good information about 1200 here: /tf/WW/en/Posts/29867#top
Jorsal Posts: 74 Rating: (31)
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