How to save the previous run data?,

hello,

i'm using AC500 PM583-eth plc. i have a problem that is if i turn off and turn on the plc the previous data is getting erased. how to solve this issue.

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chandhu Rank: 1166

Asked 26 days ago

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during the programming session, you must must use "create boot project" in Codesys menu - online

With this command, the operating code is write inside the cpu and when you reboot the cpu, you have already running your data

Hope this help you

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by chandhu Rank: 1166 on 5/28/2018 12:03:34 AM | Like (0) | Report

thanks for the reply.
i have done the create boot project also but no solution

by Flavio Mussolin Rank: 4 on 5/28/2018 12:09:50 AM | Like (0) | Report

In this case, as kstoilov wrote in the second answer, you need to better explain the condition where you lost the programmed data

by chandhu Rank: 1166 on 5/28/2018 12:19:09 AM | Like (0) | Report

OKAY

by chandhu Rank: 1166 on 5/28/2018 12:48:42 AM | Like (0) | Report

data erased it means, i'll explain this with a sample program.

i wrote a sample program by taking

a. one digital output from the digital output module (QX1000.0)
b. one analog input for the analog input module(IW0)
C. one word memory address (%MW500.0).

TO TURN ON THE DIGITAL OUTPUT QX1000.0

if the analog input IW0 is greater than or equals to WORD MEMORY %MW500.0 then the DO should turn on.
i went to online mode.

and i changed the %MW500.0 value 0 to 200.
the program is working as per the logic.

after that i turned off the plc and turned on the plc

after completing the booting

the changed %MW500.0 value 200 is change to 0.
it is not saving the previous data.

this is my problem

by Flavio Mussolin Rank: 4 on 5/28/2018 12:55:35 AM | Like (0) | Report

How have explain you kstoilov, you need to assign retain data to the variable %MW500.0
Any variation of variables not retain, will be zero value after power off - power on

At the follow link one similar question about retentive variables

http://www402.abbext.com/Retentive-timer-PM583-q14698402.aspx

by chandhu Rank: 1166 on 5/28/2018 3:03:06 AM | Like (0) | Report

thanks for the help

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Flavio Mussolin Rank: 4

Answered 26 days ago

Hi,

You didn't mention which data is erased.

If the project itself - create boot project.

If the variables - read retain and persistent.

Also may be %RB from hardware configuration of the PLC but in this case you have to create a logic to save the retain data in this area.

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kstoilov Rank: 8

Answered 26 days ago

Hi,

In case you need retain value, I could recommend using of named variables for it and analog input value, instead of %MW format. Use %MW format only if you need to exchange that variables to other PLC/HMI trough Modbus.

Then declare the variable SETPOINT (named format example) as RETAIN PERSISTENT as in example below. You can also put initial value e.g. 200 for it, for having some value at it during first download of the logic to the CPU.

For making %MW variables retain, you have to use %RB area of the PLC and create logic to transfer your variables to it - first cycle from %RB to %MW, otherwise from %MW to %RB.

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kstoilov Rank: 8

Answered 26 days ago

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