Automatic control function programming manual ladder language

Language element Includes Comment
Variables
%Y0 to %Y7C %Y variable of size .L (the size is not specified)
0 to ff Immediate value (hexadecimal)
.0 to .7, .B, .W or .L To access a bit, byte, work or long word
variable
Example
%Y4 -> 0.5 The address of the variable pointed to is equal to the address contained in the
pointer + post-offset «0».
%Y7c -> ff.B The address of the variable pointed to is equal to the address contained in the
pointer + post-offset «0xff».
3.10.3 Examples of Use of Pointers
Processing of a Character String
%V500.L = «ABCDEF» // %V500.L contains the start address of string «ABCDEF»
%Y8.L = %V500.L // Pointer initialised with string start address
%Y8 -> 0.B == «A» // Access to the first character in the string
%Y8 -> 5.B == «F» // Access to the sixth character in the string
%Y8.L += 1 // Pointer increment
%Y8 -> 0.B == «B» // Access to the second character in the string
Management of Four Machine Panels
REMARK: The sample programme PUPITREP available under PLCTOOL illustrates the use
of pointers.
In a %TS
spy(0, %IrcOO.&, %Qrc00.&) // Branch to %SP0 (where rc == panel number from 1 to 4)
In %SP0
// contains the address of the first input %Irc00
// contains the address of the first output %Qrc00
%Y0 -> 2.0 %Irc2.0 Jog_1
%Y0 -> 2.1 %Irc2.1 Jog_10
%Y0 -> 2.2 %Irc2.2 Jog_100
%Y0 -> 20.W %Irc20.W Spindle potentiometer
%Y0 -> 22.W %Irc22.W Feed rate potentiometer
%Y4 -> 0.0 %Qrc0.0 Led_arus
%Y4 -> 0.1 %Qrc0.1 Led_dcy
%Y4 -> 1.0 %Qrc1.0 Led_1
%Y4 -> 1.1 %Qrc1.1 Led_10
en-938846/8 3 - 71
3