dunc

GX works program read in a structured project?

3 posts in this topic

in GX works; is there any way around reading a structured project from a Q series CPU if the symbolic data (which takes up loads of room) isn't downloaded to the CPU initially?

with a simple project you can simply read the program straight to a new project and then work with it. this doesn't appear to be possible with a structured project?

siemens and allen bradley can manage this without having a huge CPU for a relatively small program, why cant mitsubishi?

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I always thought you could read from the PLC's internal memory- but the code is always presented in MELSEC Instruction List.

 

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15 hours ago, dunc said:

in GX works; is there any way around reading a structured project from a Q series CPU if the symbolic data (which takes up loads of room) isn't downloaded to the CPU initially?

If symbolic data havent been downloaded - you cant. 

But if this is small project (but i doubt because you are using Q series PLC, so it seems not the small project) you can simply recreate program by youself in Structured LD by reading MELSEC IL or if this PLC supports GX Works 2 - Simple LD. I did it once (when i have a little free time). Its simple to understand which addresses GX IEC Developer/Gx Works using for local  variables. So it isnt hard, only depends how much time you have.

13 hours ago, collinsd70 said:

I always thought you could read from the PLC's internal memory- but the code is always presented in MELSEC Instruction List.

Mostly i am working with FX series. In GX IEC you cant download symbolic data in FX PLC and as a result you can upload only in Melsec IL. In GX Works 2 - you can download Symbolic Data and then upload Structured LD porject (or if didnt download - upload in simple LD). But i believe you can download Symbolic Data only in newer version of PLC (for example for FX3U it must be 3.10+ version of PLC), but maybe i am wrong.

15 hours ago, dunc said:

siemens and allen bradley can manage this without having a huge CPU for a relatively small program, why cant mitsubishi?

I always thought it something for protection data from uploading. You must have Structured Project if you working with this PLC or you should write your own project.

Edited by SolidRio

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