Toshiba ASD-G9ETH Manual Do Utilizador

 

  

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ICC 

were desired to read the inverter’s status 1 word (register 1302), torque 
(register 1319) and output voltage (register 1306), this could be accomplished 
in two different ways: 

1.  Implement three separate Modbus read transactions, each one 

reading one register only, or 

2.  Implement one single Modbus read transaction, starting at register 

1302 for a quantity of 18 registers.  Then, pick out the registers of 
interest and ignore the rest of the response data. 

 
While both of these methods will certainly work, neither one of them is 
optimized for the task at hand, which is to access three specific register values.  
A fully optimized solution can be realized, however, by making use of the 
interface card’s Modbus register remapping capabilities.  This mechanism 
operates by allocating a block of 50 user-configurable registers (2001..2050) 
that remap to other inverter registers.  In this way, non-contiguous inverter 
registers can be grouped together in any order and accessed efficiently via the 
Modbus TCP “read multiple registers” and “write multiple registers” function 
codes.  The net effect is one of being able to transfer larger blocks of registers 
using fewer Modbus transactions, which results in improved network utilization 
and simpler data manipulation code on the Modbus master device. 
 

 

 
Figure 49 shows the register remap configuration array.  Clicking on an entry 
field in the “Remaps To” column allows the user to enter an inverter register 
number that will then be accessible at the register indicated in the adjacent 
“Register” column.  An assignment of 0 in the “Remaps To” column indicates 
that no inverter register is remapped at that location, which results in written 
values being ignored and read values returned as a default value of 0.  Note 
that remapped inverter registers are still accessible at their original locations: 
remapping simply provides an additional means of accessing the original 
register’s value. 
 
As an example, the configuration shown in Figure 49 reveals that a total of six 
inverter registers have been remapped: register 1007 (command 1 word) has