![siemens step 7 struct extra byte siemens step 7 struct extra byte](http://www.plcdev.com/files/plcdev/images/siemens-missing03.png)
I cannot imagine that is the reality on your case. In s7-300/400 world, they use the term packed (I think that is the term) when they want exactly the layout they defined rather than extra bits & bytes of fluff attached to things. and response frames are 16 bytes long and their structure is described in the.
![siemens step 7 struct extra byte siemens step 7 struct extra byte](http://www.plcdev.com/files/plcdev/images/s7-lite-editor.png)
Siemens step 7 struct extra byte software#
My understanding of bit assignments with word-sized tags is that byte_2.bit_0 is the 0 bit of an 8-bit bool array. software and to version 5.1 and higher of the STEP 7 software. Let's say portal is really assigning 16 bits to every byte-sized UDT.
![siemens step 7 struct extra byte siemens step 7 struct extra byte](https://demo.dokumen.tips/img/380x512/reader025/reader/2021050305/5515c9ba497959fd1d8b501c/r-1.jpg)
If that is the case, you may be in trouble with your PLC firmware and Portal version combination. If nothing is pointed to on the last input byte, does the warning go away (just for confirmation that is indeed the memory being addressed by the compiler even if the UDT does not need those 8 bits)? The following examples show the syntax for the date and time for Thursday, December 25, 1993, at 8:12 and. The DATEANDTIME data type has the following range: DT-0:0:0.0 to DT-23:59:59.999. IB108 does not exist, so it gives you the warning. When you enter date and time using the DATEANDTIME data type (DT), your entries are stored in binary coded decimal format in 8 bytes. The very last byte, IB107 (or whichever is last), if associated with that UDT, will point to IB107 and IB108. The migrated project can be loaded into the F-CPU directly without further translation. The program structure of S7 Distributed Safety and the signature are intact. If I read the Assignments on the S7-1500 correctly, there are single byte tags (IB100. Migration from S7 Distributed Safety to STEP 7 Safety As a result of the migration, you will have a complete STEP 7 Safety Project, including a Safety Program. Is that normal? I don't see anywhere in the docs that UDT size is a multiple of 16 bits. If I make the array 17 bits, the UDT lenght grows to 4 bytes. Even if the UDT contains an array with only 3 Bools, the tooltip in the Assignment list says it has a lenght of 2 bytes. But I have no idea why the warning appears, it may be an indication for some problem I don't see.īTW there is one more strange thing. byte index / / Value must be EVCURRENT / define EIOSABI 7 / OS ABI identification.
Siemens step 7 struct extra byte download#
It's a warning, I can download the project to PLC (PLCSIM advanced 16, don't have the hardware yet) and it works. This file defines standard ELF types, structures, and macros. When I click the Go To arrow next to the warning, TIA opens the Assignment list and highlights IB100.bit0 However, when I compile the project I get a warning " Inputs or outputs are used that do not exist in the configured hardware". In the 16DI module configuration it looks OK - please see attached screenshot I have a UDT, which contains one Array of bool, nothing else.Īn instance of that UDT is declared at address %I100.0 (that's the start input address of a ET200 16DI module).