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Wich is the right way to call SFC12 Several times?

Created by: TEBANCH at: 6/8/2010 11:08 PM (6 Replies)

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6/8/2010 11:08 PM	Rate (0)
TEBANCH Silver Member Joined: 3/25/2008 Last visit: 1/28/2022 Posts: 232 Rating: (20)	Hello dear Colleagues. I'm working with SFC12, i have to be able to enable/disable one or more DP Slaves; until now i have tested the SFC12 and it works pretty good but now i'm facing a problem; i have to build a FB in wich i have to use SFC12 several times, one to readthe status of a DP slave, the second call is to disable the same DP Slave, and the last call is for enable this DP slave, please refer to the attachedfile in wichi show 2 direrent configurations forthe "Multiple Call" of SFC12 (FB2 and FB3). FB1 is my "Prototype". My big question is:Can i call SFC12 unconditionally several times and justtake careabout not make the "REQ"parameter true at the same time? Or should i put some conditions to the "EN" parameter to avoid the SFC12 get excecuted several times at the same time? Thanks all you for your kind help, and have a nice day. Attachment FB_DP_En_Dis.zip (522 Downloads)
	Last edited by: TEBANCH at: 6/8/2010 11:22 PM Corrections in the attached program, oops! Keep working!
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6/8/2010 11:26 PM	Rate (1)
dchartier Grandmaster-Expert Joined: 9/27/2006 Last visit: 4/19/2025 Posts: 12346 Rating: (2710)	Hello Tebanch; Before we start discussing your partculars, have you read the following FAQ: Notes on the use of SFC 12? http://support.automation.siemens.com/WW/view/en/17624225 It shows you how to use the signals REQ and Busy to sequence the calls of SFC 12, and it mentions that there is a limit on the number of simultaneous calls of SFC 12 (4 per Profibus line). Hope this helps, Daniel Chartier

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This contribution was helpful to 2 thankful Users TEBANCH H-H

6/10/2010 3:56 PM	Rate (0)
TEBANCH Silver Member Joined: 3/25/2008 Last visit: 1/28/2022 Posts: 232 Rating: (20)	Hello dchartier, thanks a lot for your reply; i have readed the FAQ you suggested and until now i almost have finished my block i only have one open issue wich is: I'm able to disable and check the status of my DP slaves but something is very strange to me, when i try to re-enable a DP device, it do not "Recovery" inmediatly; i have to put my master PLC in Stop mode and then run a Warm restart. When the master PLC comes in to run mode, then the DP device is re-enabled. By the way, i only have one slave in my DP netwrok, it is a S7-319 CPU configured as DP slave; the master on the network is a S7-319 also. Maybei did not read/or understand all the instructionsto get SCF12 runing well, but i do not remember any note that says "When you wish to reenable a DP device you must run a warm reestart" or something like that; having said that my big questions are: Is it necesary to carry out a warm/cold restart to re-enable a DP device whe you have disabled it using SFC12? Do you have any tip or experience you can shareabout the right way to acomplish the re-enable task without stoping the master PLC? Thanks a lot for your help, and have a very nice day.
	Keep working!
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6/10/2010 4:49 PM	Rate (1)
dchartier Grandmaster-Expert Joined: 9/27/2006 Last visit: 4/19/2025 Posts: 12346 Rating: (2710)	Hello Tebanch; In programs where I have used SFC12, I have always noticed a delay in re-activating a DP-slave (that was de-activated earlier), but I never experienced anything that required a reset of the PLC. The FAQ I proposed earlier does mention "Activating a DP-Slave might be costly in time", without any more specifications. Does the slave CPU ever come back online, after any kind of delay? Do any error codes appear in the RET-VAL output of the SFC while you are re-activating your slave? If there are, please check them as per the codes described in the System and Standard Functions manual (also available in your Step 7 computer, under Simatic/Documentation): http://support.automation.siemens.com/WW/view/en/1214574 Siemens also provides this sample program for using SFC 12: http://support.automation.siemens.com/WW/view/en/5608020 I know it is a very simple function to use, basically, but please just check if anything is missing in your implementation, compared to theirs. Hope this helps, Daniel Chartier

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This contribution was helpful to 1 thankful Users TEBANCH

6/10/2010 6:01 PM	Rate (0)
TEBANCH Silver Member Joined: 3/25/2008 Last visit: 1/28/2022 Posts: 232 Rating: (20)	Hello dchartier. Thanks again for your suggestions and tips, now i can say the problem is solved. My aplication scans the network and check if there is some DP slave notconnected butconfigured in HWConfig. If there isoneDisconected DP Slave i call SFC12 in mode 0 to check if this slave is enabled or not, then the HMI ask to operator if he will like to disable those DP devices, if the operatorselect "Disable" option in HMI i activate SFC12 in mode2, and the specific DP device is disabled,after thati call SCF12in mode 0 again and this was my error. I can not explain why, butwhen you try to find ifthe statusof apreviusly deactivated DP device, the RetVal parameter of SFC12 goes to 28674 (7002 HEX); in online help i found this description: "7002Interim call (REQ irrelevant). The activated job is still active; BUSY has value 1. " I do not know how to interpretthat description, but the most strange issue is thatafter thati was not able to run any otheractivation/deactivation job until i just put my PLC in stop and then in Run mode again. So in conclusion i think the best is to do not try to find the status of a DP device when you know it is disabled; but it is just an idea and i will be very happy if some of you dear colleagues correct my point of view. Thanks all you, and have a very nice day.
	Keep working!
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This contribution was helpful to 1 thankful Users dchartier

4/13/2016 8:18 AM	Rate (0)
MORE P D Posts: 9 Rating: (0)	dchartier Hello Tebanch; Before we start discussing your partculars, have you read the following FAQ: Notes on the use of SFC 12? http://support.automation.siemens.com/WW/view/en/17624225 It shows you how to use the signals REQ and Busy to sequence the calls of SFC 12, and it mentions that there is a limit on the number of simultaneous calls of SFC 12 (4 per Profibus line). Hope this helps, Daniel Chartier hello E1, i am using 315 2 PNDP CPU & SMC module EX 600# SPN it is possible to enable or disable the SMC module in the network ??? i am using TIA Portal V13.. what should i do ?? thanks Pratik ------------------------------------------------------------------------------------------ Split from Wich is the right way to call SFC12 Several times?.
MORE P D Posts: 9 Rating: (0)	Last edited by: Blue Moderator at: 4/13/2016 9:43:51 AM New subject after splitting
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4/13/2016 9:51 AM	Rate (0)
Blue Moderator Platinum Member Joined: 4/21/2006 Last visit: 1/27/2025 Posts: 510 Rating: (24)	Closed, cause question posted twice. The second thread with the subject how to enable or disable third party SMC module is published within the conference Communication / Networks. Best regards Blue Moderator

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