Allen-Bradley ControlLogix 1756 - TAG Guidelines; TAG Examples

Publication 1756-RM084F-EN-P - July 2002
3-30 Creating a Complete Import/Export File
TAG guidelines
Keep these guidelines in mind when defining a tag:
•
Tags must be defined after devices (if there are no devices, then
after the data types) within the controller body.
•
Base tags and aliases can be defined out of order within a tag
block.
•
You cannot define a 2
nd
dimension without a 1
st
dimension or a
3
rd
dimension without a 2
nd
dimension.
•
The initial values must comply with the tag type and
dimensions.
•
Whitespace can not occur within the initial values or within the
type/dimension specifier.
TAG examples
TAG
bits : MySint := [0];
dest : INT (RADIX := Decimal) := 0;
overflow OF bits.MyBit0 (RADIX := Binary);
source : REAL (RADIX := Exponential) := 0.0;
timer : TIMER[3] := [[0,0,100],[0,10,100],[0,0,50]];
END_TAG
This example shows forced tag data:
TAG
dint_a : DINT (RADIX := Decimal) := 0;
int_a : INT (RADIX := Decimal) := 0;
tag_a : UDT_A (ProduceCount := 2) := [0,0],
TagForceData := [0,0,0,0,1,0,-1,-1,1,0,-72,34];
END_TAG