8. Modbus protocol
8. 11. Communication scanner
The communication scanner can be used to enhance application performance. The drive automatically copies
The input table and the output table each contain 8 variables.
Output variables | Logic address | Default assignment | |
[Com Scan Out1 val.] (nC1) | 12 761 | = 16#31D9 | Control word (CMd) |
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[Com Scan Out2 val.] (nC2) | 12 762 | = 16#31DA | Speed reference (LFrd) |
[Com Scan Out3 val.] (nC3) | 12 763 | = 16#31DB | Not used |
[Com Scan Out4 val.] (nC4) | 12 764 | = 16#31DC | Not used |
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[Com Scan Out5 val.] (nC5) | 12 765 | = 16#31DD | Not used |
[Com Scan Out6 val.] (nC6) | 12 766 | = 16#31DE | Not used |
[Com Scan Out7 val.] (nC7) | 12 767 | = 16#31DF | Not used |
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[Com Scan Out8 val.] (nC8) | 12 768 | = 16#31E0 | Not used |
Input variables | Logic address | Default assignment | |
[Com Scan In1 val.] (nM1) | 12 741 | = 16#31C5 | Status word (EtA) |
[Com Scan In2 val.] (nM2) | 12 742 | = 16#31C6 | Output speed (rFrd) |
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[Com Scan In3 val.] (nM3) | 12 743 | = 16#31C7 | Not used |
[Com Scan In4 val.] (nM4) | 12 744 | = 16#31C8 | Not used |
[Com Scan In5 val.] (nM5) | 12 745 | = 16#31C9 | Not used |
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[Com Scan In6 val.] (nM6) | 12 746 | = 16#31CA | Not used |
[Com Scan In7 val.] (nM7) | 12 747 | = 16#31CB | Not used |
[Com Scan In8 val.] (nM8) | 12 748 | = 16#31CC | Not used |
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The values of these communication scanner variables can be displayed on the graphic display terminal using the
These parameters can be accessed via all the read and write requests supported by the drive.
There is a marked improvement in performance for the following functions:
Code | Modbus name | Description | Size of data |
3 = 16#03 | Read Holding Registers | Read N output words | 63 words, max. |
4 = 16#04 | Read Input Registers | Read N input words | 63 words, max. |
16 = 16#10 | Write Multiple Registers | Write N output words | 61 words, max. |
23 = 16#17 | Read/Write Multiple Registers | Read/write N words | 20/20 words max. |
43 = 16#2B | Read Device Identification | Identification |
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