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Shift register not working after power failure

Created by: Johnluck at: 4/19/2020 11:57 PM (11 Replies)

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4/19/2020 11:57 PM	Rate (0)
Johnluck Experienced Member Joined: 3/29/2012 Last visit: 10/8/2023 Posts: 61 Rating: (0)	I used shift register bits in some lighting control in my home automation. The retentive memory on the shift register and pulse generator used for the shifting were checked. But each time there is power failure, all the shift register bits will be permanently on(bit are not shifting). But when I reload the program everything will work normal. I have four LOGO 0BA8 in the project communicating with one another via ethernet . The same scenario happens to the shift register bits of the four of them after power failure. There is no memory card install on three of the LOGO. The fourth LOGO has a memory card because it communicate with customize web server . Does anyone know what can cause this? Can putting memory cards on the remaing three LOGO solve the problem? please note that I use M8 for the shift register initialization.
	johnluck
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4/20/2020 5:13 AM	Rate (0)
ixo65 Grandmaster-Expert Joined: 12/18/2014 Last visit: 12/11/2023 Posts: 31595 Rating: (3928)	Strange mistake, I am not yet aware of. Can you upload your program? Are all LOGO!s of the same type?Please write the exact order numbers and the exact firmware versions. I don't think that SD cards solve your problem.
	Last edited by: ixo65 at: 04/20/2020 05:15:09
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4/20/2020 9:50 AM	Rate (0)
Johnluck Experienced Member Joined: 3/29/2012 Last visit: 10/8/2023 Posts: 61 Rating: (0)	Thanks for the prompt reply. The part number for three of the LOGO is 6ED10521fb00-0bA8 with Firmware verison V1.08.02. The fourth one has the part number of 6ED10521fb08-0BA0 with firmware version 1.82.02. Attached is the program as requested by you. please note that LOGO 3 Output 5 to Output 12 make use of shift register bits , Output 17 and Output 19 of the same LOGO 3B025 also make use of shift register bits. Output 1 and Output 2, Output 5 to Output 8, Output 9 to Output 12 of LOGO 4 also make use of shift register bits. B016, B034 and B049 are LOGO 4 shift register blocks. B025 and B070 are LOGO 3 shift register Block. Thanks Attachment JOHNLUCK_HOME_PROJECT_LATEST_VERSION.zip (252 Downloads)
	johnluck
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4/21/2020 3:02 PM	Rate (0)
ixo65 Grandmaster-Expert Joined: 12/18/2014 Last visit: 12/11/2023 Posts: 31595 Rating: (3928)	I'm sorry, but I can't help you with that. Maybe Siemens can help you. Start a Support Request.

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4/21/2020 5:21 PM	Rate (0)
Johnluck Experienced Member Joined: 3/29/2012 Last visit: 10/8/2023 Posts: 61 Rating: (0)	Okay thanks. I will do as you suggested..
	johnluck
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7/29/2023 7:36 PM	Rate (0)
jondav1120 Member Joined: 5/16/2022 Last visit: 10/8/2023 Posts: 6 Rating: (0)	Hi Johnluck, Did you you get any resolution on this issue? I am experiencing a very similar issue with a shift register on power cycling of the hardware, but it works as expected in the simulation. Regards John

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7/30/2023 2:30 AM	Rate (0)
ixo65 Grandmaster-Expert Joined: 12/18/2014 Last visit: 12/11/2023 Posts: 31595 Rating: (3928)	jondav1120 Hi Johnluck, Did you you get any resolution on this issue? I am experiencing a very similar issue with a shift register on power cycling of the hardware, but it works as expected in the simulation. Regards John Please upload your program as a ZIP file ...

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7/30/2023 10:33 AM	Rate (0)
Johnluck Experienced Member Joined: 3/29/2012 Last visit: 10/8/2023 Posts: 61 Rating: (0)	Hi, I was not able to get a resolution from the siemen then but I think I re-wrote the program to restart the shift register with M8 whenever the LOGO restart after power failure.
	johnluck
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7/31/2023 12:03 PM	Rate (0)
jondav1120 Member Joined: 5/16/2022 Last visit: 10/8/2023 Posts: 6 Rating: (0)	Thanks Johnluck, I am currently struggling to reproduce the issue on my test hardware which is running the latest firmware. I have been searching the Siemens website for the various firmware packages for the LOGO! and have only found the most recent one (1.83.02) and its changelog. I'm wondering if this is a firmware bug that has been sorted in an update, but unfortunately I didn't think to pull the firmware version from the site that is affected! [snip] ixo65...I've uploaded the essence of the program that is causing the problem. The shift register is initialised to have its first bit high and each pulse on I1 then steps the bit through the shift register. M1-10 in the real program are message texts, so the effect is that I1 scrolls through all the screens. What is happening is that on power cycling the unit in question comes back up with M1 and M2 active. It is almost as if B003 is set to be retentive (which it isn't). By setting it to retentive I can reproduce the behaviour exactly in both simulation and hardware Attachment Shift Register Bug Demo.zip (154 Downloads)
	Last edited by: Jen_Moderator at: 08/01/2023 07:54:46 Division of question into separate topic.
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7/31/2023 12:27 PM	Rate (0)
ixo65 Grandmaster-Expert Joined: 12/18/2014 Last visit: 12/11/2023 Posts: 31595 Rating: (3928)	jondav1120 ixo65...I've uploaded the essence of the program that is causing the problem. The shift register is initialised to have its first bit high and each pulse on I1 then steps the bit through the shift register. M1-10 in the real program are message texts, so the effect is that I1 scrolls through all the screens. What is happening is that on power cycling the unit in question comes back up with M1 and M2 active. It is almost as if B003 is set to be retentive (which it isn't). By setting it to retentive I can reproduce the behaviour exactly in both simulation and hardware I tested your small program on my LOGO! 8.3 (V1.83.02). I doesn't show the error that you described. I shifted e.g. that the S1.4 is active, switch off the power an then on again. After new start is only Q1 active, Q2 not. The simulation also shows not the error.

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