4/20/2022 12:42 PM | |
Joined: 4/24/2006 Last visit: 5/21/2024 Posts: 8650 Rating: (1151)
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Hello, The address I0.0 will be used, when you insert a Inputcard to the CPU. The integrated In- and Outputs have address 124.0 and so on, they have this address so they do not interfere with I/O Cards. Here a link to manual: SIMATIC S7-300 Automation System S7-300: Getting Started CPU 31xC: Commissioning Best regards, Wizard |
4/20/2022 12:56 PM | |
Joined: 5/16/2019 Last visit: 3/7/2024 Posts: 3 Rating: (0) |
i understand, Thank you for your help!. Best regards, Dan |
4/20/2022 12:59 PM | |
Joined: 9/27/2006 Last visit: 5/21/2024 Posts: 12257 Rating: (2668)
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Hello Dan; To understand why the integrated I/O of the CPU 313C-2DP start at i124.0 and Q124.0, you have a few notions to consider. But first, from the trchnical data of this CPU, this is how Siemens describes the integrated digital I/O (see the attached screenshot): https://support.industry.siemens.com/cs/us/en/view/12996906/29049578763 Every Siemens CPU treats digital I/O addresses as part of the process image tables. Digital I/O refers to bit-sized information, that can take values 1 oe 0. The process image space for your CPU is 128 bytes , from 0.0 to 127.7. If you place a digital input module in the CPU rack, the first module next to the CPU will use addresses I0.0 to I0.7 (for example). To make sure these addresses attached to a didotal input or output midulw are not disturbed, Siemens has attributed the integrated digital I/O addresses that are at the top of the process image tables. Registers that are used for analog values or communications, generally in 16-bit increments, are used outside of hhe process image tables, and calle peripheral addresses. They start at address 128 after the process image tables. The first analof module in your CPU rack will be addressed as PIW128 if it is an input module, or as PQW128 for an output module. The P refers to a perpheral address. If this feels a bit confusing, try this experiment. Open the hardware configuration and add digital and analog I/O modules to he CPU rack. Note the input and output addresses reserved for different modules. See the nuber od bits reserved for digital modules, depending if they are designed for 8. 16 or 32 bits. Try with an analig module, for current ir voltage signals, and examine where their addressing starts. You can find a lot more information in manuals such as Programming with Step 7; https://support.industry.siemens.com/cs/ww/en/view/109751825 Hope this helps, |
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