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S7_GRAPH S_NO not the same as real Sequence Step number

Created by: wondem at: 7/8/2023 10:31 AM (5 Replies)

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7/8/2023 10:31 AM	Rate (0)
wondem Joined: 11/1/2021 Last visit: 9/3/2025 Posts: 12 Rating: (0)	Hello, I am new to TIA programming. The S_NO displayed on the Function block of graph program is not the same as the real active step number on the sequence program, when the Function block is in auto mode. I am expecting if it is on Auto Mode then the S_NO out put will be the same as the real active step number in the sequence program. This happen when I change in the Sequence control from "Automatic" mode to "Manual" mode and then back to Automatic mode at "Testing": "Sequence Control": "Mode". When this happen I can not change it to normal state, I have to restart/ reset the program to get to normal condition. Normal condition is when the S_NO is the same as the real sequence Step number when the program is running in Automatic mode. How can I solve this with out memory resetting the program? I use the S_NO from graph out put to control the program. But the S_NO is not is not matching with the real sequence number which causing a problem in my program. Attachment S_NO not match with Real step number.png (428 Downloads)
	Last edited by: Jen_Moderator at: 07/10/2023 10:59:28 Text formatting optimized.
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7/9/2023 7:27 PM	Rate (0)
Stefan Arcularius Platinum Expert Joined: 1/21/2013 Last visit: 8/29/2025 Posts: 4087 Rating: (633)	Hi wondem, Your screenshot does not show the entire GRAPH block. The TRUE state of S_MORE indicates that more than one step is active. So you probably have a parallel branch where step 4 is active. In the case of parallel branches, the rightmost step is displayed first. You can use S_PREV or S_NEXT to toggle the numbers displayed at S_NO. Kind regards Stefan

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7/11/2023 3:27 AM	Rate (0)
wondem Joined: 11/1/2021 Last visit: 9/3/2025 Posts: 12 Rating: (0)	Stefan Arcularius Hi wondem, Your screenshot does not show the entire GRAPH block. The TRUE state of S_MORE indicates that more than one step is active. So you probably have a parallel branch where step 4 is active. In the case of parallel branches, the rightmost step is displayed first. You can use S_PREV or S_NEXT to toggle the numbers displayed at S_NO. Kind regards Stefan Dear Stefan I haven't used Simultaneous branch in the program. There is no case where two or more step are active at the same time in my current GRAPH program. Only one step is active at a time in my current program. I haven't got a solution yet to the problem. Step-4 is not active, S_ACTIVE block status also shows FALSE.

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7/11/2023 6:23 AM	Rate (0)
Stefan Arcularius Platinum Expert Joined: 1/21/2013 Last visit: 8/29/2025 Posts: 4087 Rating: (633)	Hi wondem, Your screenshot shows that more than one step is active. Without knowing your GRAPH function block, I can't tell you more. In addition to simultaneous branches, using more than on sequence within the GRAPH function block will also result in more than on active steps. Kind regards Stefan

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7/12/2023 4:37 AM	Rate (0)
wondem Joined: 11/1/2021 Last visit: 9/3/2025 Posts: 12 Rating: (0)	Stefan Arcularius Hi wondem, Your screenshot shows that more than one step is active. Without knowing your GRAPH function block, I can't tell you more. In addition to simultaneous branches, using more than on sequence within the GRAPH function block will also result in more than on active steps. Kind regards Stefan Dear Stefan, Thank you for your reply Trust me, it is only one step is active in the program. I haven't used simultaneous branches. in the program. And also there is only one sequence (Sequence(1)). I try to duplicate the problem, but I didn't know exactly when this problem happen. Attachment S_NO_only one sequence.png (355 Downloads)
	Last edited by: wondem at: 07/12/2023 04:39:13
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7/12/2023 5:14 AM	Rate (0)
Stefan Arcularius Platinum Expert Joined: 1/21/2013 Last visit: 8/29/2025 Posts: 4087 Rating: (633)	Hi wondem, Sorry, I missed something in your screenshot. S_ACTIVE is FALSE, so your block is not showing only the active steps. I wonder why the block behaves this way, since changing the display mode requires the maximum interface parameter set. Of course, you can change this by modifying the static parameters. So check the status of MOP.SACT_DISP, MOP.SEF_DISP, MOP.SALL_DISP. Kind regards Stefan

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