Toshiba MBP-100 Manual De Usuario

 

  

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40050 

MSTR function (read) 

2 

40051 

Error code 

Read Only 

40052 

Number of consecutive registers to read 

2 

40053 Starting 

register 

1 

40054 

Destination node address 

2 

40055 

Master node address 

1 

2.  Set the middle portion of the MSTR instruction to 40100.  This will be the 

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

40100 

Value of register 1 @ network address 2 

40101 

Value of register 2 @ network address 2 

3.  In this case, we are accessing two registers, so set the bottom portion of 

the MSTR instruction (“number of registers”) to 2.  In the case of MSTR 
reads, this number cannot be greater than 125 by definition. 

4.  Initiate the read command by closing internal relay 1.  The data response 

will be seen in the MSTR Data Area (register 40100). 

 
 

The following example demonstrates how to use the MSTR instruction to write 
4 registers starting at register 1 to an MBP-100 located at Modbus Plus network 
address 32. 

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

2.  Set the top portion of the MSTR Instruction to 40060.  This will be the 

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

40060 

MSTR function (write) 

1 

40061 

Error code 

Read Only 

40062 

Number of consecutive registers to write 

4 

40063 Starting 

register 

1 

40064 

Destination node address 

32 

40065 

Master node address 

1 

3.  Set the middle portion of the MSTR instruction to 40200.  This will be the 

starting address of the MSTR Data Area.  This is the location that will 
contain the write data to be used in the MSTR write transaction.