HOAKKK (Customer) asked a question.
I watched this video tutorial and saw that using C0 to store when stopping and running still retains the value before stopping
https://www.youtube.com/watch?v=B0yAS4XJItg&ab_channel=ACCAutomation
But when I write the program, C0 does not save the value when running
Stop
When running again, C0 does not hold the value when turned on
PLC Memory Retentive Programming - Do-More Designer Tutorial
Master PLC memory retention! Stop losing output states during power failures. Finally understand retentive programming with Do-More Designer, step by step.
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https://accautomation.ca/programming/plc-beginners-guide/
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0:00 - Introduction to Memory Retention
0:20 - Testing Current Program Behavior
0:40 - Power Loss Simulation Demo
0:51 - Enter Edit Mode for Modifications
1:02 - Change Outputs to Memory Retentive
1:48 - Check Controller Documentation
2:00 - Insert New Rung for Real Output
2:44 - Download Program to PLC
2:47 - Test Memory Retention Function
3:13 - Power Cycle Test Results
3:23 - Programming Best Practices
3:40 - Wrap Up and Conclusion
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✅ How to implement memory retentive outputs in Do-More Designer
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The entire playlist for learning PLC programming can be found at the following URL:
https://www.youtube.com/playlist?list=PL3y71jAPOdZB5LJMMotZP36LvzfdgkgzW
The following videos are available in this series:
Learn PLC Programming - Free
1 - Installing the Software
https://youtu.be/r5IY4P2hHqU
2 - Your First PLC Program
https://youtu.be/tdK7q8XrkBo
3 - Program Documentation
https://youtu.be/Eb9fhMXYago
4 - Start / Stop / Jog Circuit
https://youtu.be/K8DYWYSEHVQ
5 - Jog Circuit Memory Retentive
https://youtu.be/B0yAS4XJItg
6 - Understanding Decimal and Binary Numbering
https://youtu.be/qLT7DjXYy5k
7 - Binary Interpretation
https://youtu.be/v7HYH92xrAY
8 - The Secret of Timers
https://youtu.be/Bt6i8G8P0Fk
9 - The Secret of Counters
https://youtu.be/pyNNKRA_xK8
PLC Beginner's Guide to PLC Programming
https://accautomation.ca/programming/plc-beginners-guide/
Visit our Website for more PLC series.
Regards,
Garry
ACC Automation
https://www.accautomation.ca
https://www.youtube.com/watch?v=B0yAS4XJItg&ab_channel=ACCAutomation
The behavior you are describing is not related to rententive memory. By default, C0 through C2047 are set to RETENTIVE (this can be observed and modified in PLC > System Configuration > Memory Configuration). If you were to set element C1 to TRUE in a Data View while the Simulator were RUN mode and then transition from RUN to STOP to RUN again, you would see that C1 is still TRUE.
The behavior you are seeing with C0 in your logic is related to Termination Scan Behavior. One of the many actions that will take place when a Program code-block terminates is ALL of the Output Coil (OUT) instructions will be turned OFF. See Help Topic DMD0232 in the Do-More Designer software help file for a brief overview of Termination Scan Behavior. For more information on Termination Behavior, see Help Topic DMD0192.