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mode selector switch on cpu 1214c

Created by: MINKU at: 3/28/2012 12:24 PM (5 Replies)

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3/28/2012 12:24 PM	Rate (0)
MINKU Posts: 36 Rating: (0)	hello i am using 1214c cpu and programming through TIA v11 sp2,[1]I want to ask you that there is no mode selector switch on cpu to switch between stop and start, what is the significance of not giving the switch?? [2]I also want to ask you that how we can make the cpu start/stop in the field where system(PC) is not available. thanks and regards
MINKU Posts: 36 Rating: (0)	Last edited by: O_Moderator at: 3/29/2012 11:22 AM third question is splitted to /tf/WW/en/Posts/71588#top
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3/28/2012 1:33 PM	Rate (0)
Ganes10 Platinum Member Joined: 8/31/2010 Last visit: 12/6/2025 Posts: 1525 Rating: (231)	MINKU hello i am using 1214c cpu and programming through TIA v11 sp2,[1]I want to ask you that there is no mode selector switch on cpu to switch between stop and start, what is the significance of not giving the switch?? [2]I also want to ask you that how we can make the cpu start/stop in the field where system(PC) is not available. [schnippschnapp] thanks and regards Hello MINKU, [1]. & [2]. How does startup work in an S7-1200? [schnippschnapp] Attachment Toggle in LAD.jpg (404 Downloads)
	Last edited by: O_Moderator at: 3/29/2012 11:24 AM Like it? Rate it!
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3/29/2012 1:48 PM	Rate (0)
MINKU Posts: 36 Rating: (0)	Thanks Ganes 10 for the toggle program. i tried the same and it is working. I have uploaded the togggle program, which i had written, but not working. Pleasetell me the problem with this logic. Attachment toggle.jpg (391 Downloads)
MINKU Posts: 36 Rating: (0)
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3/29/2012 5:08 PM	Rate (0)
0_Einstein Grandmaster-Expert Joined: 7/7/2010 Last visit: 1/14/2026 Posts: 16369 Rating: (2522)	MINKU Thanks Ganes 10 for the toggle program. i tried the same and it is working. I have uploaded the togggle program, which i had written, but not working. Pleasetell me the problem with this logic. The problem is what I have always heard called "an order of solve" problem. Think like the plc which solves left to right, top to bottom. Assume Tag 3 is off Scan 1: Tag1 becomes 1. Tag2 becomes 1. Tag3 becomes set. {we are not done solving logic} Tag3 is set, so the bottom right reset happens, and now Tag3 is reset. Scan 2.....n: does not matter as it will never leave tag 3 on.
	science guy
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3/30/2012 8:12 AM	Rate (0)
MINKU Posts: 36 Rating: (0)	Thanks. I got what you said. But still i am not clear. What i understand with PLC is that during one scan cycle, PLC reads all the inputs used in the program, performs logic and then writes the outputs. So if any of the input or output is changed within the same scan cycle, it would not be taken up in performing rest of the logic. It should only be taken up in next scan cycle. e.g. scan1 tag1 becomes 1 tag 2 becomes 1 tag 3 is set now,bottom right should not execute i.e. reset should not be in the same scan cycle. It should execute in next scan cycle only depending on input conditions. Please make me understand the way logic is executed and the scan cycle. Also let me know the advantage of using M memory bits instead of reading or writing output bits i.e. Q bits. How to access L local memory in TIA V11? example would be fine to understand. Iam not able to get example programs on TIA portal. The examples of SIMATIC manager are not opened in TIA except one or two because other examples are notof .ap11 extension. Thanks
MINKU Posts: 36 Rating: (0)	Last edited by: MINKU at: 3/30/2012 8:23 AM
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3/30/2012 6:36 PM	Rate (0)
0_Einstein Grandmaster-Expert Joined: 7/7/2010 Last visit: 1/14/2026 Posts: 16369 Rating: (2522)	All logic is solved every scan in all cyclic OBs. If a cyclic OB calls an FB or FC every scan, then that logic is likewise solved every scan. Just think about wiring up a physical relay. If you wired up that relay, you'd get a little chattering of the output. PLCs can do the same thing with order of solve type problems. Using M bits and DBs allows us to make generic routines and map the results to physical outputs. It means we can rewire and reuse code relatively easily. We just use the M bits to turn on the correct wired output. Then we can make a piece of logic and reuse it without worrying about how it is wired until final implementation into the target system. All logic is solved just like in physical wiring, electricity is not picky about turning something on (or off)just because we don't want it or think it should.
	science guy
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