Published: 08/16/2012
| Question: | In MotionWorks IEC, what causes the Misaligned Datatype error and how can it be resolved? |
| Answer: | The Misaligned Datatype error occurs when a variable is assigned to a hardware location such as %I or %Q, and the specified address is not in alignment with the starting address of the I/O driver.
For example, if the drivers starting address is %IB1000, data elements assigned in the memory area of the driver must have a remainder of zero when performing the following calculation:
((MyDataAddress - DriverHeadAddress) MOD MyDataSize) = Remainder
Where MyDataSize is in bytes.
If an LREAL is assigned at %IL1017 the calculation shows that the value is misaligned.
((1017 - 1000) MOD 8) = 0.125 (Misaligned)
If the LREAL data is moved to %IL1024, the the data is aligned:
((1024 - 1000) MOD 8) = 0 (Aligned)
To see the head address of the driver, look at the I/O Group header in the Global Variables list, or look at the IO_Configuration screen, which is populated by the Hardware Configuration.
Global Variables List
Elementary DataType Reference from MotionWorks IEC help system:
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Product Information:
| Product Group: | Motion |
| Product: | MotionWorks IEC, MP2000iec Series, MP2300Siec, MP2310iec, MP2600iec, MP3200iec |
| Applications: | |
| Category: | Instructions; Programming; Software; Troubleshooting |
| Part/Model#: | MotionWorks IEC, MotionWorks IEC Pro, MP2300Siec, MP2310iec, MP2600iec, MP3200iec |
Other Information:
| Link to related files: |  |
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