5/17/2019 6:02 PM | |
Joined: 1/24/2019 Last visit: 12/2/2022 Posts: 6 Rating: (0) |
Dear experts Im working with a CPU314C-2PN/DP (Attached image PLC config) and doing the PLC config in the "Properties" dialog box (Attached image PLC config2). The default value for "Size in the process image input area" and the "Size in the process image output area" is 256, but some of my addresses in the cards config are bigger than 256 i.e. the FM351, the AO4 card, and the analog embedded card in the 314C My question is, would the PLC be able to read those cards input/output even if the configured addresses are bigger than 256? I tried to increase the 256 number to 1000 but the HW config showed up an inconsistency dialog box saying that I couldn't do that because my CP 342-5 addresses CANT be in the process-image The code is already done and working, I do not want to change anything on it because is very complex; the situation here is that the code is working in a CPU313C and we want to change the PLC to a CPU314C. Thanks in advance for your help! Javier AttachmentImages.zip (132 Downloads) |
5/17/2019 7:03 PM | |
Joined: 9/27/2006 Last visit: 4/23/2024 Posts: 12257 Rating: (2665)
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Hello; To provide you with an answer you need to understand the basics of address areas in your CPU (the available bytes for the Process Input/Output table areas varies with the CPU you are working with). Essentially you need to see the difference between the PII/PIQ areas ( that you can access as I10.2 or IW26) and the peripheral addresses that are outside of the boundaries of the PII/PIq, that must be accessed as PIW272 or PQW360. Where and when do you need peripheral addressing? https://support.industry.siemens.com/cs/ww/en/view/18325417 Peripheral inputs when it should be a Normal Input Bytes Below you will find information extracted from the Technical Data of your CPU. Notice that "default" bytes available for the inputs and outputs are set to 256, which corresponds to PII/PIQ from byte 0 to byte 255. As you have seen, analog inputs/outputs which must be available to the CPU on an immediate basis are refered to as peripheral addresses; same thing forwhat you see with your communication CP. Digital input/output addresses in your first screenshot are shown below byte 255, the analog and communication addresses above. Hope this helps, Daniel Chartier |
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