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PCS7 unsigned dint

Created by: pablo11x at: 10/18/2012 1:33 PM (3 Replies)

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10/18/2012 1:33 PM	Rate (0)
pablo11x Posts: 2 Rating: (0)	Hello, I read variable from external device through serial modbus. This variable is unsigned dint (0 — +4 294 967 295) but in PCS7 we have only dint with signed (−2 147 483 648 — +2 147 483 647). How to use unsigned dint in PCS7? Any other ideas? pablo11x
pablo11x Posts: 2 Rating: (0)
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10/18/2012 5:40 PM	Rate (0)
Silent Bob Posts: 836 Rating: (100)	Hi, DINT Datatypein S7 is always signed. TheBit 0 - 30 are the value bits and bit 31 is for the sign. You can find the desription of the datatypes in the online help ofSIMATIC manager or CFC. You should use DWORD as format, because it 32 bit long and has no specific internal representation. Its just a sequence of bits. You can usedata type conversion function to convert it to whatever youwant. For instance DWORD_TO_DINT, or DWORD_TO_INT. You can find those function in the help of SCL editor.
Silent Bob Posts: 836 Rating: (100)
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10/18/2012 9:11 PM	Rate (0)
pablo11x Posts: 2 Rating: (0)	Hello, Thanks a lot, solution was so simple:) pablo11x
pablo11x Posts: 2 Rating: (0)
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7/31/2013 8:27 AM	Rate (0)
O_Moderator Diamond Member Joined: 4/24/2009 Last visit: 8/20/2024 Posts: 2682 Rating: (135)	New question was splitted to convert a DWORD TO DINT Best regards O_Moderator
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