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11 INSTRUCTIONS AND FUNCTIONS
Program Example
(1) Program example for a format 1 control table
100 ' A program example that writes data to extension file registers by specifying sequential addresses
110 DIM TBL%(10),A%(20)
120 TBL%(0)=255
130 TBL%(1)=7
140 D!=10
150 H!=INT(D!/65536!)
160 L!=D!-H!*65536!
170 H$=RIGHT$("0000"+HEX$(H!),4)
180 L$=RIGHT$("0000"+HEX$(L!),4)
190 TBL%(2)=VAL("&H"+L$)
200 TBL%(3)=VAL("&H"+H$)
210 TBL%(4)=3
220 A%(0)=0123
230 A%(1)=4567
240 A%(2)=8901
250 PCWT TBL%( ),A%( )
260 END
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• Assign values to %(2) and %(3) ( %(5) and %(6) in case of a format 2 control
table) in the following manner.
D!
• • • •
Device number expressed in sequential address
H!
L!
• • • •
Used as work areas.
H$
L$
to
100 H!=INT(D!/65536!)
110 L!=D!-H! 65536!
120 H$=RIGHT$("0000"+HEX$(H!))
130 L$=RIGHT$("0000"+HEX$(L!))
140 %(2)=VAL("&H"+L$)
150 %(3)=VAL("&H"+H$)
to
In case of a format 2control table
• • • •
%(5)=VAL("&H"+L$)
• • • •
%(6)=VAL("&H"+H$)
:
'Defines arrays
:
Specifies the station number to
communicate with to the local station
:
'Specifies to write data to extension file
registers by specifying sequential
addresses
:
'Specifies the sequential addresses for
writing
:
'Higher byte of the sequential address
:
'Lower byte of the sequential address
:
'Stores the lower byte in the control table
:
'Stores the higher byte in the control table
:
'Specifies the number of points to be
written
:
'Specifies the data to be written
:
'Executes the write operation
MELSEC-Q
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