Allen-Bradley Studio 5000 Logix Emulate User Manual

Chapter 12
Common attributes for Motion instructions
664 Rockwell Automation Publication MOTION-RM002H-EN-P-February 2018
For example:
Definitions Example Description
my_list defined as DINT[10] my_list[5] This example references element 5 in the array. The
reference is static because the subscript value
remains constant.
my_list defined as DINT[10]
position defined as DINT
MOV the value 5 into position
my_list[position]
This example references element 5 in the array. The
reference is dynamic because the logic can change
the subscript by changing the value of position.
my_list defined as DINT[10]
position defined as DINT
offset defined as DINT
MOV the value 2 into position
MOV the value 5 into offset
my_list[position+offset]
This example references element 7 (2+5) in the
array. The reference is dynamic because the logic
can change the subscript by changing the value of
position or offset.
Make sure any array subscript you enter is within the boundaries of the specified
array. Instructions that view arrays as a collection of elements generate a major
fault (type 4, code 20) if a subscript exceeds its corresponding dimension.
When you enter an immediate value (constant) in decimal format (for example,
-2, 3) the controller stores the value by using 32 bits. If you enter a value in a radix
other than decimal, such as binary or hexadecimal, and do not specify all 32 bits,
the controller places a zero in the bits that you do not specify (zero-fill).
Important:
Zero-fill of immediate binary, octal or hexadecimal values less than 32
bits.
If you enter The controller stores
-1 16#ffff ffff (-1)
16#ffff (-1) 16#0000 ffff (65535)
8#1234 (668) 16#0000 029c (668)
2#1010 (10) 16#0000 000a (10)
Logix controllers handle floating point values according to the IEEE 754 standard
for floating-point arithmetic. This standard defines how floating point numbers
are stored and calculated. The IEEE 754 standard for floating point math was
designed to provide speed and the ability to handle very large numbers in a
reasonable amount of storage space.
A REAL tag stores a single-precision, normalized floating-point number
Denormalized numbers and -0.0 are treated as 0.0
If a computation results in a NAN value, the sign bit could be positive or negative.
In this situation, the software displays 1#.NAN with no sign.
Immediate values
Floating Point Values

Allen-Bradley Studio 5000 Logix Emulate Specifications

General

Brand	Allen-Bradley
Model	Studio 5000 Logix Emulate
Category	Controller
Language	English