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power off then setpoint become zero

Created by: RAJKIRAN at: 5/4/2012 2:47 PM (18 Replies)

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5/4/2012 2:47 PM	Rate (0)
RAJKIRAN Silver Member Joined: 8/18/2009 Last visit: 7/28/2025 Posts: 558 Rating: (33)	Dear Expert, I have used CPU300 in our plant,whenever power goes in CPU then setpoint become zero.... I used shared DB for stored setoint value..... what is problem...
	Rajkiran Patil
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5/4/2012 3:10 PM	Rate (0)
Amit_86 Posts: 1750 Rating: (272)	RAJKIRAN Dear Expert, I have used CPU300 in our plant,whenever power goes in CPU then setpoint become zero.... I used shared DB for stored setoint value..... what is problem... Hello Rajkiran, Check OB100 logic. May be some logic written there to make all valueZero.
Amit_86 Posts: 1750 Rating: (272)
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5/4/2012 3:13 PM	Rate (0)
Marko Bursic Posts: 1410 Rating: (154)	Also check that DB and look if you checked the option as non-retain DB.
Marko Bursic Posts: 1410 Rating: (154)
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5/4/2012 6:17 PM	Rate (0)
Aret Posts: 2348 Rating: (265)	Also if your CPU is old you should make DB as retentive in HWKonfig in CPU properties. For new CPUs there is no such tab - all DB are retentive (except case mentioned by Marco)
Aret Posts: 2348 Rating: (265)
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5/7/2012 10:09 AM	Rate (0)
AGR Posts: 43 Rating: (1)	Hi, Please refer screen shot for more clarity Best Regards, AGR Attachment DB_retentive.JPG (527 Downloads)
AGR Posts: 43 Rating: (1)
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5/7/2012 10:15 AM	Rate (0)
Eastern Posts: 557 Rating: (64)	Hello, Try this. bypass your all program put BE in ob1 & power on off if value will retain that mean values are going zero because of program, use ob 100 also for that purpose. in hardware confi you can configure M memory as a retantive memory try that also.
Eastern Posts: 557 Rating: (64)
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5/7/2012 11:36 AM	Rate (0)
Wishme Experienced Member Joined: 8/20/2009 Last visit: 11/6/2024 Posts: 80 Rating: (5)	Check if there's anyinitialization program written in OB100 Warm restart OB. If not define this DB in CPU's property from Hardware configuration. Regards, VishP.
	Vishme. Hang on...may be we drop a step before Success.
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5/7/2012 12:23 PM	Rate (0)
Wizard Diamond Expert Joined: 4/24/2006 Last visit: 12/22/2025 Posts: 9088 Rating: (1202)	Dear RAJKIRAN, Please tell us the CPU you are using. Extract from manual: --------------------------------- The size of the retentive main memory (for retentive data blocks) of the CPU can be found in the chapters (Technical information CPU) --------------------------------- There is a Maximum size of non-volatile memory for retentive data blocks Best regards, Wizard

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5/7/2012 12:37 PM	Rate (0)
Darius Platinum Member Joined: 9/28/2005 Last visit: 12/9/2025 Posts: 2957 Rating: (243)	Wizard There is a Maximum size of non-volatile memory for retentive data blocks Correct me if I'm wrong, but isn't it that all DB are retentive ? Or I misunderstood something ?
	Best regards, Darius
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5/7/2012 1:12 PM	Rate (0)
Wizard Diamond Expert Joined: 4/24/2006 Last visit: 12/22/2025 Posts: 9088 Rating: (1202)	Darius Wizard There is a Maximum size of non-volatile memory for retentive data blocks Correct me if I'm wrong, but isn't it that all DB are retentive ? Or I misunderstood something ? Hello, For smal CPU's it is right. But for example CPU 315-2dp If you look at technical info you will see: integrated memory: 256 kb Maximum size of non-volatile memory for retentive data blocks 128 kb. Best regards, Wizard

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