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MELSEC-Q
11 INSTRUCTIONS AND FUNCTIONS
Use the data read from the PLC CPU by using the PCRD instruction for the sequence program
to be written. If other data is written, the PLC CPU cannot operate normally.
Program Example
(1) Program example for a format 1 control table
100 'A program example that writes the sequence program stored in a memory card to the PLC CPU
110 '(Capacity of the main sequence program: 8 k steps)
120 DIM TBL%(10),A%(100)
:
'Defines arrays
130 OPEN "0:PROG8.DAT" FOR INPUT AS #1
:
'Opens the file
140 FOR J=&H0 TO, &H1FC0 STEP 64
150 FOR I=0 TO 63
160 INPUT #1,A%(I)
:
'Reads from the file
170 NEXT I
180 TBL%(0)=255
:
'Specifies the station number to
communicate with to the local station
190 TBL%(1)=8
:
'Specifies to write the sequence program
200 TBL%(2)=1
:
'Specifies to write to the main sequence
program area
210 TBL%(3)=J
:
'Specifies the head step number to be
written
220 TBL%(4)=64
:
'Specifies the number of steps to be written
230 PCWT TBL%( ),A%( )
:
'Executes the write operation
240 NEXT J
250 CLOSE
:
'Closes the file
260 END
