Toshiba MBP-100 Manual De Usuario

 

  

65

40200 

Value to write to register 1 @ network address 32 

40201 

Value to write to register 2 @ network address 32 

40202 

Value to write to register 3 @ network address 32 

40203 

Value to write to register 4 @ network address 32 

4.  In this case, we are accessing four registers, so set the bottom portion of 

the MSTR instruction (“number of registers”) to 4.  In the case of MSTR 
writes, this number cannot be greater than 100 by definition. 

5.  Initiate the write command by closing internal relay 1.  The data at registers 

40200, 40201, 40202, and 40203 will be written to registers 1, 2, 3 and 4, 
respectively, of the MBP-100 located at network address 32. 

 
 

The following example demonstrates how to use the MSTR instruction to read 
32 words of global data from an MBP-100 located at Modbus Plus network 
address 10. 

1.  Set up a ladder logic program as shown in Figure 37. 

2.  Set the top portion of the MSTR Instruction to 40070.  This will be the 

starting address of the MSTR Control Block. Set the control block registers 
to the following values: 

40070 

MSTR function (global read) 

6 

40071 

Error code 

Read Only 

40072 

Number of consecutive registers to read 

32 

40073 

Number of words available to read 

Read Only 

40074 

Destination node address 

10 

40075 

Master node address 

1 

3.  Set the middle portion of the MSTR instruction to 40300.  This will be the 

starting address of the MSTR data area.  This is the location that will 
contain the data returned from the MSTR global data read transaction. 

40300 

Value at offset 0 in global data from network address 10 

40301 

Value at offset 1 in global data from network address 10 

: : 

40300+n  Value at offset n in global data from network address 10 

: : 

40331 

Value at offset 31 in global data from network address 10