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perfectly acceptable to write to a tag that starts with “rd” and read from a tag that starts with “wr”.
[_reg_] is just the
[register number] is a 1- to
Examples |
|
Read “acceleration time 1” (register #10) ................................... | rd_reg_10 |
Write “option frequency command” (register #1008) .................. | wr_reg_1008 |
Read “inverter status 1” (register #1402).................................... | rd_reg_1402 |
Additionally, a few special tags exist which provide
Table 5: Special Tag Reference
Service | Tag Name | Register Start | Same As… |
Data table read | rd_reg_basic | 1 | rd_reg_1 |
Data table read | rd_freq_out | 1401 | rd_reg_1401 |
Data table read | rd_inv_stat1 | 1402 | rd_reg_1402 |
Data table read | rd_torq_out | 1419 | rd_reg_1419 |
Data table read | rd_inv_stat2 | 1443 | rd_reg_1443 |
Data table write | wr_reg_basic | 1 | wr_reg_1 |
Data table write | wr_cmd1 | 1007 | wr_reg_1007 |
Data table write | wr_freq_cmd | 1008 | wr_reg_1008 |
Data table write | wr_cmd2 | 1024 | wr_reg_1024 |
Data table write | wr_torq_cmd | 1034 | wr_reg_1034 |
To read data from the interface card, the application PLC program must reference a “source element” from which to start reading and the “number of elements” to read. The “source element” will be a tag name constructed according to the naming convention shown above, or a special tag as shown in Table 5. The “source element” can be either a base tag (such as “rd_reg_1301”, which starts at register 1301), or an offset from a base tag (such as “rd_reg_1301[4]”, which starts at register 1301+4 = register 1305, the drive’s input voltage monitor register).
In a similar manner, to write data to the interface card, the application PLC program must reference a “destination element” to which to start writing and the “number of elements” to write. Again, the “destination element” will be a tag name constructed according to the naming convention shown above, or a special tag as shown in Table 5.
Whether reading or writing, the “number of elements” can be any quantity of registers from 1 to the maximum allowable length (1485).
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