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Pointer as a parameter for function

Created by: JOTOMATISE at: 10/27/2020 12:48 PM (11 Replies)

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10/27/2020 12:48 PM	Rate (0)
JOTOMATISE Posts: 6 Rating: (0)	Hey there! can someone give me an example of using pointer as function input in Tia Portal V15. Thank you so much.
JOTOMATISE Posts: 6 Rating: (0)	Last edited by: JOTOMATISE at: 10/27/2020 13:46:28
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10/27/2020 1:47 PM	Rate (2)
0_Einstein Grandmaster-Expert Joined: 7/7/2010 Last visit: 12/4/2025 Posts: 16292 Rating: (2518)	Start with TIA Portal opening or creating a PLC project. Open OB1 or any OB/FB/FC, and then press F1 for TIA portal's integrated Help. Use the Search tab to find help on using Pointer. There are examples there - without waiting on a random forum user to reply. Please post back what you find and if it helped answer your real question. JOTOMATISE Hey there! can someone give me an example of using pointer as function input in Tia Portal. Thank you so much.
	science guy
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10/27/2020 1:57 PM	Rate (0)
JOTOMATISE Posts: 6 Rating: (0)	So, I created an FC function with an input variable "ADDRESS" type Pointer. but when I write this instruction in LIST: L ADDRESS it gives me an error. same thing for : L P ## ADDRESS
JOTOMATISE Posts: 6 Rating: (0)
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10/27/2020 2:02 PM	Rate (0)
JOTOMATISE Posts: 6 Rating: (0)	i want to know how to use pointer variable in function. an example of use
JOTOMATISE Posts: 6 Rating: (0)
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10/27/2020 2:26 PM	Rate (0)
0_Einstein Grandmaster-Expert Joined: 7/7/2010 Last visit: 12/4/2025 Posts: 16292 Rating: (2518)	What PLC are you using? The answer depends on which PLC you are using. In general, if an FC or FB is configured to as non-optimized, it will accept pointers. However, L addressing is only available on s7-300/400 (if I understand correctly). JOTOMATISE So, I created an FC function with an input variable "ADDRESS" type Pointer. but when I write this instruction in LIST: L ADDRESS it gives me an error. same thing for : L P ## ADDRESS
	science guy
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10/27/2020 3:12 PM	Rate (0)
JOTOMATISE Posts: 6 Rating: (0)	S7-1500
JOTOMATISE Posts: 6 Rating: (0)
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10/27/2020 3:20 PM	Rate (1)
qwazee Platinum Expert Joined: 3/30/2020 Last visit: 12/5/2025 Posts: 5645 Rating: (1076)	JOTOMATISE So, I created an FC function with an input variable "ADDRESS" type Pointer. but when I write this instruction in LIST: L ADDRESS it gives me an error. same thing for : L P ## ADDRESS Hello. Mr. Einstein does not have much experience with using STL. He is however an expert in making code work on the S7-1500 in the way that is optimum. The S7-1500 does not like following STL code, but it loves SCL. Pointers and S7-1500 are also not friends like the pointers and S7-300 were friends. In the case you are using the S7-1500, please let us know what you need the pointer for. Though that piece of info would be welcome if you do use the S7-300 / S7-400. The code you used for the S7-300 / S7-400 in Step7 V5.x should work in TIA Portal, but it will not work nicely for the S7-1500. The S7-1200 does not even have the ability to emulate STL execution. What are your thoughts? Regards.
	Last edited by: qwazee at: 10/27/2020 15:21:38 Last edited by: qwazee at: 10/27/2020 15:23:40 NOTE: The reply was delayed. Important piece still valid. Last edited by: qwazee at: 10/27/2020 15:24:00 Activities of this user is voluntary. There is no obligation or liability placed on this user. Though optional, your 'please' and 'thank you' is highly valued.
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10/27/2020 3:34 PM	Rate (1)
jacek d Platinum Expert Joined: 9/23/2005 Last visit: 12/5/2025 Posts: 5142 Rating: (771)	JOTOMATISE can someone give me an example of using pointer as function input in Tia Portal V15. As already pointed out, hardly anyone has idea why you need it on S7-1500. Unless you are porting legacy software. Go to Properties of the block and uncheck "Optimized block access". And here goes an example.
	Regards, Jacek What is confusing you is the fact that you never see a number but always its digit representation. So you end up thinking that the number is the representation. - Andrej Bauer Any claims against me - based on whatever legal reason - resulting from the use of any code and/or ideas presented on this forum shall be excluded. #StayWithUkraine
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This contribution was helpful to 2 thankful Users JOTOMATISE CemisJ

10/27/2020 3:45 PM	Rate (0)
JOTOMATISE Posts: 6 Rating: (0)	I just want to know the usefulness of pointers in programming the automat s7-1500. because i read in the docs that the s7-1500 accepts pointer data types. but I haven't found any example of using pointers. I'm preparing a presentation of data types on s7-1500 (USInt, SInt, UInt, Real, Char, String, DTL, ARRAY, ANY, Pointer ... etc) Regards
JOTOMATISE Posts: 6 Rating: (0)
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10/27/2020 4:16 PM	Rate (0)
qwazee Platinum Expert Joined: 3/30/2020 Last visit: 12/5/2025 Posts: 5645 Rating: (1076)	jacek d As already pointed out, hardly anyone has idea why you need it on S7-1500. Unless you are porting legacy software. Go to Properties of the block and uncheck "Optimized block access". And here goes an example. @jacek .. I count you as a respected (and mostly misunderstood) expert. Your example is most appropriate for the open-ended academical question.It illustrates your point about converting S7-300 code. Receiving a one-star-rating from the topic starter is most inappropriate. Perhaps the topic starter does not need seasoned wisdoms from us. Bye
	Last edited by: qwazee at: 10/27/2020 16:17:41 Activities of this user is voluntary. There is no obligation or liability placed on this user. Though optional, your 'please' and 'thank you' is highly valued.
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This contribution was helpful to 1 thankful Users jacek d

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