ISPSoft User Manual

ISPSoft User Manual
When users declare a symbol whose data type is ARRAY, they can set the initial value of the
symbol. Please refer to the following example.
[1,2,3,4,5] in the Initial Value cell for A_Ary indicates that the initial value of A_Ary[0] is 1, the
initial value of A_Ary[1] is 2, the initial value of A_Ary[2] is 3, the initial value of A_Ary[3] is 4, and
the initial value of A_Ary[4] is 5. [1,3(0),5] in the Initial Value cell for B_Ary indicates that the
initial value of B_Ary[0] is 1, the initial value of B_Ary[1] is 0, the initial value of B_Ary[2] is 0, the
initial value of B_Ary[3] is 0, and the initial value of B_Ary[4] is 5.
A_Ary
B_Ary
Element Initial value Element Initial value
A_Ary[0] 1 B_Ary[0] 1
A_Ary[1] 2 B_Ary[1] 0
A_Ary[2] 3 B_Ary[2] 0
A_Ary[3] 4 B_Ary[3] 0
A_Ary[4] 5 B_Ary[4] 5
• Symbol whose data type is STRING
In ISPSoft, a string is composed of ASCII codes, and the ASCII codes are surrounded by double
quotes, e.g. “ABCD”. A symbol whose data type is STRING is generally used with an applied
instruction. Please refer to the programming manual for a model for more information. Besides,
only AH500 series CPU modules support the symbols whose data types are STRING, and the
data type of a symbol of the VAR_INPUT class, the VAR_OUTPUT class, or the VAR_IN_OUT
class in a function block can not be STRING. As a result, if users want to process a string in a
function block, they can create the string as a global symbol. Please refer to chapter 7 for more
information about the usage of function blocks.
When users declare a symbol whose data type is STRING, they can specify the maximum size of
the string. The number of characters in a string is within the range between 1 and 128, and one
character occupies 1 byte. The number of devices assigned to the characters in a string must
conform to the size of the string, and one extra byte must be assigned to the ending character in
the string. If the last character and the ending character in a string does not occupy the two bytes
in a word device, the ending character will be assigned another device. For example, two word
devices (four bytes) will be assigned to a string which is composed of three characters, and three
word devices (six bytes) will be assigned to a string which is composed of four or five characters.
Please refer to the following figure. The number in the parentheses in the Type… cell for a
symbol whose data type is STRING indicates the maximum size of the string. Besides, the
characters in the Initial Value cell for a symbol whose data type is STRING can not be put in
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