Mitsubishi Electric MELSEC Q Series Structured Programming Manual page 60

[Structured ladder/FBD]
[ST]
FOR Index1:=0
END_FOR;
(3) Maximum number of array elements
The maximum number of array elements differs depending on data types as shown below.
Bit, word (signed), word (unsigned)/16-bit string, timer, counter, and retentive timer
Double word (signed), double word (unsigned)/32-bit string, single-precision real, and time
Double-precision real
String
4.4 Method for Specifying Data
4-36
4.4.7 Arrays
TO 4
BY 1 DO
INC(TRUE,Var_D0[Index1]);
1. When a label or a device is specified for an array index, the operation is
performed with a combination of multiple sequence instructions. Therefore, if
an interruption occurs during the operation of the array label, an unintended
operation result may be produced.
When using interrupt programs, use interrupt disable/enable instructions (DI/EI
instructions) as necessary.
*1
2. If the index which is outside of the defined range is specified for an array
index, any of the following operations occur.
•An operation error occurs.
•A current value of other label is referred or written.
*1: For example, a value other than the value within 0 to 2 is used for the index of an array which
is declared with the bit array (0..2).
Table 4.4.7-2 Maximum number of array
Data type Maximum number
32768
16384
8192
32768 divided by string length