Rockwell Automation 1746-QS,D17466.19 SYNCHRONIZED AXES MODULE - Manual (Page 45)

Using Processor Files C–3
Publication 1746-6.19 March 1998
Module’s
M0 File
Axis 4 #Nx:48
Axis 3 #Nx:32
Axis 1 #Nx:0
Each N file contains 16 words
of Configuration Parameters
Axis 2 #Nx:16
16-word Files
for Axis
Configuration
Parameters 16-word Files
for Axis
Configuration
Parameters
>>>
>>>
>>>
>>>
Ladder Logic
COPY
instructions
When commanded, ladder logic copies 16 words of axis configuration
parameters from the module’s M1 file to processor N files.
Axis 4 #Nx:48
Axis 3 #Nx:32
Axis 1 #Nx:0
Module’s
M1 File
Axis 2 #Nx:16
16-word Files
for Axis
Configuration
Parameters 16-word Files
for Axis
Configuration
Parameters
Each N file con-
tains 16 words
of Configuration
Parameters
>>>
>>>
>>>
>>>
Ladder Logic
COPY
instructions
Using Floating-point for Values Above 32,767
If your data, such as a position value in a motion command, is in the
range of –32,767 to +32,768, ladder logic can operate on it directly
as integer (N) values. If using values above 32,767, then your ladder
logic must substitute floating-point files (F) for integer files (N) and
use compute instructions to change from integer to floating-point.
As a result, ladder logic:
wraps the value from +32,767 to –32,768 (signed integer)
increments the value (less negative, smaller in absolute value)
with each increasing count
For example, we show how ladder logic handles these numbers:
32,767–32,770, 40,000, and 65,535 max:
You Want Signed Integer You Want Signed Integer
32,767 32,767 32,770 –32,766
32,768 –32,768 40,000 –25,536
32,769 –32,767 65,535 –1
The number you want (above 32,767) = signed integer + 65,536.