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I have not been able to use S_SEL, S_ON and S_OFF in GRAPH.

Created by: Colombian1976 at: 1/27/2010 3:56 AM (5 Replies)

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1/27/2010 3:56 AM	Rate (0)
Colombian1976 Posts: 3 Rating: (0)	Hi there I need to control in MANUAL mode a Graph FB in my application without using the Sequencer Control in GRAPH. I know that I have to use the following FB parameters: S_SEL, S_ON and S_OFF, and that they work with a positive edge. This is what I have done so far but I have not had any success: 1) I set to 1 the SW_MAN and I set to 0 the SW_AUTO. 2) I give a step number to S_SEL. 3) I set to 1 the S_ON and S_OFF is set to 0. When I have the Sequencer Control window open and I toggle the FB parameters (SW_MAN, SW_AUTO, S_OFF) in the FB, I can see that the Sequencer Control changes, but if I toggle S_ON it does not do anything, there is not a change in the Sequencer Control window. In the DB related to this FB, I can see that the Step number is loaded it in the DB (S_SEL) but I can not see any change at the output (S_ON). Am I missing something here?? What else should I enable/disable in the FB?? Do you have any examples related to this application?? Cheers
Colombian1976 Posts: 3 Rating: (0)
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11/25/2010 2:56 PM	Rate (0)
sinuhe Posts: 2 Rating: (0)	Hello! Did you find how to do it? Best Regards
sinuhe Posts: 2 Rating: (0)
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3/4/2013 8:42 PM	Rate (0)
RMENA Member Joined: 10/20/2012 Last visit: 3/7/2013 Posts: 1 Rating: (0)	I have the same problem. I have figured out that when in manual mode, if changing the value in the S_SELit is possible to go to other steps.It is a problem, because thevalue at S_SEL must change.For example ifhavethe number five in the input S_SEL, and and changed to step 11using S_NEXTit is not possible toget back for step5 using S_SEL, because this entry must change and its current value is 5. The manual of S7-Graph informs that using S_ON and S_OFF this transition should happen, but it do not work.Is itan error ata siemensmanual? Pease experts,how to change for S_SEL step using S_ON and S_OFF?? Is it a siemens manual mistake? Rafael Mena

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12/18/2014 2:37 PM	Rate (0)
Milov Bronze Member Joined: 6/13/2011 Last visit: 10/29/2024 Posts: 65 Rating: (3)	I have had the same problem. S_SEL, S_ON and S_OFF don't work correctly. I have wrote simple code to control sequence from WinCC. When the sequence is in manual mode: DBxx.OFF_SQ = True At the next cycle execution of the program: DBxx.OFF_SQ = False DBxx.SONX[1] = _required step_ DBxx.SONX[0] = 2 DBxx is instance DB for sequence. If you write function for control the sequence you have to declare variable for .SONX[0] and .SONX[1] like IN_OUT parameters, because sequence block will back .SONX[0] from 2 to 1 after transition. Don't write DBxx.SONX[1] outside step range. I use "Standard" FB Parameters (S7 Graph Option->Block settings>Compile/Save).

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4/27/2023 7:37 AM	Rate (0)
JBA-DK Joined: 9/7/2022 Last visit: 10/8/2024 Posts: 1 Rating: (0)	I had the same problem. Could not activate steps i manual mode. Found out i had to select the active step (S_SEL) and turn it off (S_OFF). Then i could select a different step (S_SEL) an turn it on (S_ON)

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1/23/2024 3:00 PM	Rate (0)
yacineamkamk Advanced Member Joined: 12/26/2014 Last visit: 10/31/2024 Posts: 5 Rating: (0)	I had the same problem and I managed to fix it via the help of this article: https://www.dmcinfo.com/latest-thinking/blog/id/9656/siemens-s7-graph-tips-and-tricks Basically, I use an external (SCADA) bit to start the transition from current step to a new step I put in S_SEL and the mode has been switched to manual by SW_MAN: //--- Set DISP_SACT if action done U EXT_ACT_S U S_ON U( L S_NO L S_SEL ==I ) S DISP_SACT //--- Set S_OFF to off the current S_NO U MAN_ON U ACT_S U SACT_DISP U( L S_NO L S_SEL <>I ) S S_OFF //--- Set DISP_SALL after S_NO=0 U MAN_ON U ACT_S U SACT_DISP U( L S_NO L 0 ==I ) S DISP_SALL //--- Set S_SELOK after S_NO=S_SEL and SALL_DISP U MAN_ON U ACT_S U SALL_DISP S S_SELOK //--- Set S_ON after S_NO=S_SEL and SALL_DISP U MAN_ON U ACT_S U SALL_DISP U( L S_NO L S_SEL ==I ) S S_ON //--- Reset MAN_ACT if action done (S_NO=S_SEL and SACT_DISP) U ACT_S U SACT_DISP U( L S_NO L S_SEL ==I ) R DISP_SALL S DISP_SACT R S_SELOK R S_ON R S_OFF R ACT_S //--- Resetting inputs to prevent non started situations //--- Reset DISP_SALL U DISP_SALL U "Pulse2s" R DISP_SALL //--- Reset DISP_SALL U DISP_SACT U "Pulse2s" R SACT_DISP //--- Reset S_OFF if U S_OFF U "Pulse2s" R S_OFF //--- Reset S_ON U S_ON U "Pulse2s" R S_ON //--- Reset S_SELOK U S_SELOK U "Pulse2s" R S_SELOK //--- Reset ACT_S UN MAN_ON R ACT_S

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