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Created by: Farrukh1986 at: 12/26/2022 8:15 AM (5 Replies)

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12/26/2022 8:15 AM	Rate (0)
Farrukh1986 Member Joined: 9/27/2019 Last visit: 5/8/2024 Posts: 1 Rating: (0)	Dear all i am new in STL .I converted one ladder circuit in to STl. i have attached the ladder circuit. and here is STL code A I 2.0 AN I 2.0 = L 20.0 A L 20.0 AN T 0 = Q 0.0 A L 20.0 L S5T#20S SD T 0 NOP 0 L T 0 T MW 40 NOP 0 NOP 0 i want to ask from where these two commands came from i can not understand these = L 20.0 A L 20.0 Thanks in advance Attachment ladder.jpg (755 Downloads)

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12/26/2022 11:01 AM	Rate (0)
ixo65 Grandmaster Joined: 12/18/2014 Last visit: 9/3/2025 Posts: 35917 Rating: (4496)	L = local data bit of the block.

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12/26/2022 11:05 AM	Rate (0)
ixo65 Grandmaster Joined: 12/18/2014 Last visit: 9/3/2025 Posts: 35917 Rating: (4496)	Farrukh1986 But with this part of your your timer never starts. A I 2.0 AN I 2.0

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12/26/2022 11:41 AM	Rate (0)
ixo65 Grandmaster Joined: 12/18/2014 Last visit: 9/3/2025 Posts: 35917 Rating: (4496)	How are the variables stored in the temporary local data?

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1/2/2023 3:52 PM	Rate (0)
JD2Grenoble Member Joined: 12/18/2020 Last visit: 8/7/2025 Posts: 23 Rating: (2)	It's a stack. You must write the local data before use it on each PLC Cycle. You can't save data from one PLc cycle to the next in Local Area. In fact it's a temporary memory, and it can use in every FB/FC/OB blocs. If you want to save data from one cycle to an other one, yuo should use MW area (FW? I use German instruction) Or DB area.

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1/2/2023 3:58 PM	Rate (0)
JD2Grenoble Member Joined: 12/18/2020 Last visit: 8/7/2025 Posts: 23 Rating: (2)	Farrukh1986 Dear all i am new in STL .I converted one ladder circuit in to STl. i have attached the ladder circuit. and here is STL code A I 2.0 AN I 2.0 = L 20.0 A L 20.0 AN T 0 = Q 0.0 A L 20.0 L S5T#20S SD T 0 NOP 0 L T 0 T MW 40 NOP 0 NOP 0 i want to ask from where these two commands came from i can not understand these = L 20.0 A L 20.0 Thanks in advance = L20.0 A L 20.0 These instruction are put in automatic per the Siemens sofware when you change from CONT to LIST (Like the NOP 0 instruction) The sofware take the frist data free in the temp area and use it. If you add (in CONT) a variable, the software will change the L 20.0 adresse. It's just to try to write the CONT in LIST instruction. Best Regard.

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