Automating Manufacturing Systems - Process Control and ...

plc st - 19.5
Text Program Line
VAR AT %B3:0 : WORD; END_VAR
VAR AT %N7:0 : INT; END_VAR
VAR RETAIN AT %O:000 : WORD ; END_VAR
VAR_GLOBAL A AT %I:000/00 : BOOL ; END_VAR
VAR_GLOBAL A AT %N7:0 : INT ; END_VAR
VAR A AT %F8:0 : ARRAY [0..14] OF REAL; END_VAR
VAR A : BOOL; END_VAR
VAR A, B, C : INT ; END_VAR
VAR A : STRING[10] ; END_VAR
VAR A : ARRAY[1..5,1..6,1..7] OF INT; END_VAR
VAR RETAIN RTBT A : ARRAY[1..5,1..6] OF INT;
END_VAR
VAR A : B; END_VAR
VAR CONSTANT A : REAL := 5.12345 ; END_VAR
VAR A AT %N7:0 : INT := 55; END_VAR
VAR A : ARRAY[1..5] OF INT := [5(3)]; END_VAR
VAR A : STRING[10] := ‘test’; END_VAR
VAR A : ARRAY[0..2] OF BOOL := [1,0,1]; END_VAR
VAR A : ARRAY[0..1,1..5] OF INT := [5(1),5(2)];
END_VAR
Description
a word in bit memory
an integer in integer memory
makes output bits retentive
variable ‘A’ as input bit
variable ‘A’ as an integer
an array ‘A’ of 15 real values
a boolean variable ‘A’
integers variables ‘A’, ‘B’, ‘C’
a string ‘A’ of length 10
a 5x6x7 array ‘A’ of integers
a 5x6 array of integers, filled
with zeros after power off
‘A’ is data type ‘B’
a constant value ‘A’
‘A’ starts with 55
‘A’ starts with 3 in all 5 spots
‘A’ contains ‘test’ initially
an array of bits
an array of integers filled with 1
for [0,x] and 2 for [1,x]
Figure 19.5
Variable Declaration Examples
• Basic numbers are shown below. Note the underline ‘_’ can be ignored, it can be
used to break up long numbers, ie. 10_000 = 10000.