PROTOCOL-SPECIFIC INFORMATION
9.3.5 SLC-5/05 Example: Reading and Writing
Often times, applications may need to both read data from and write data to the inverter. To accomplish
this task, multiple MSG instructions will need to be implemented in the PLC program. The configuration
and execution for implementing multiple MSG instructions is in general identical to that required for
implementing just one MSG instruction. Each MSG instruction will require its own message control file.
Figure 75 shows an example of two MSG
instructions, one for reading and one for
writing. It is evident from this logic that N20
and N21 are the two independent message
control files created for these instructions.
Note that the “Read/Write” field of each of the
MSG instructions is set according to their
function.
Figure 76 shows the configuration details of
the “write” MSG instruction. Note that this
instruction will only be writing to one inverter
register: namely, the command word (Target
Data Table Address is N10:1, which equates
to inverter register 1). The source Data Table
Address in this case is N18:30.
Figure 75: Reading and Writing via MSG Instructions
To Next Page
Loading...
