Topic: DMD0431
Assignment Operations and Instructions
Bit and numeric data in a Do-more CPU is stored in data blocks or structures. Turning the bits On and OFF, setting the value of a numeric locations and copying one or more Bits and numeric location are a normal part of the process of solving a process problem. And like many things in a Do-more PLC, there are multiple ways to do the required work. But because of the underlying architecture, there are some restrictions to the types of data that can be handled by certain instructions, for example, Strings are structures not simple arrays of characters. To assist you in finding the correct instruction (or in many cases instructions) to perform the desired type of data manipulation, we have assembled the following chart that details the type of data operation you'd like to do and which instructions can perform that operation.
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PLC Instruction to perform the operation
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Operation |
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(7) |
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MOVE
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(7) |
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(8) |
STRCOPY (7) |
STRCOPYR (7) |
(7) |
(7) |
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SET
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Turn a Single BIT OFF |
Yes |
Yes |
Yes |
Yes |
Yes |
Yes |
Yes |
Yes |
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Turn a Single BIT ON |
Yes |
Yes |
Yes |
Yes |
Yes |
Yes |
Yes |
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Turn a range of BITs OFF |
Yes |
Yes |
Yes |
Yes (6) |
Yes (6) |
Yes (6) |
Yes |
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Turn a range of BITs ON |
Yes |
Yes |
Yes (6) |
Yes (6) |
Yes (6) |
Yes |
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Copy a single BIT to another BIT |
Yes |
Yes |
Yes |
Yes |
Yes |
Yes |
Yes |
Yes |
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Yes |
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Copy a single BITs to a range of BITs |
(1) |
(1) |
(1) |
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Copy a range of BITs to another range of BITs |
Yes |
Yes (2) |
Yes (2) |
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a numeric location |
Yes |
Yes |
Yes (3) |
Yes |
Yes |
Yes |
Yes |
Yes |
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Write a single constant value to a range of numeric locations |
Yes |
Yes |
Yes (3) |
Yes |
Yes |
Yes |
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Copy a single numeric location to another numeric location |
Yes |
Yes |
Yes |
Yes |
Yes |
Yes |
Yes |
Yes |
Yes |
Yes |
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Copy a single numeric location to a range of numeric locations |
(1) |
Yes |
(1) |
Yes |
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Copy a range of numeric locations to another range of numeric locations |
Yes |
Yes (2) |
Yes (2) |
Yes |
Yes (6) |
Yes |
Yes |
Yes |
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Write a string literal to a String |
Yes (4) |
Yes |
Yes |
Yes |
Yes (4) |
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Write a string literal to a range of Strings |
Yes (4) |
Yes (4) |
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Copy a String to another String |
Yes |
Yes |
Yes |
Yes |
Yes |
Yes |
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Copy a single String to a range of Strings |
(1) |
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Copy a range of Strings to another range of Strings |
Yes |
Yes |
Yes |
Yes |
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Write a value to a structure |
Yes |
Yes (5) |
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Copy a structure to another structure |
Yes |
Yes |
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Copy a single structure to a range of structures |
(1) |
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Copy a range of structures to another range of structures |
Yes |
Yes |
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Copy a single structure to a range of numeric locations |
Yes |
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Copy a range of structures to a range of numeric locations |
Yes |
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Copy a range of numeric locations to a structure |
Yes |
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Copy a range of numeric locations to a range of structures |
Yes |
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(1) Using multiple table entries of same location to multiple locations (2) Using multiple table entries for individual locations (3) Can only write a zero (4) Can only clear the string (5) Can only clear all the structure members (zeros; OFF) (6) Only possible with casting (7) Does not support casting (8) Supports unaligned memory (allowing V1 / V2 as a double-word instead of requiring V0 / V1 as a double-word) |
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See Also:
User-Created Data Blocks and Structures
Assignment Operations and Instructions
Related Topics: