User manual
Chapter 6 Block Transfer Programming
ADVANCED MICRO CONTROLS INC.
55
Positioning Setup Data (continued)
Ranges and Factory Default Values
Parameter Range Factory Default
Target Position
Linear Offset to (Linear Offset + FSC
†
)0
Overshoot Offset
(Low Speed Offset + 1) to Full Scale Count
†
1,000
Low Speed Offset
0 and (Stop Offset + 1) to (Overshoot Offset - 1) 500
Stop Offset
1 to (Overshoot Offset - 1) if Low Speed = 0
1 to (Low Speed -1) if Low Speed ≠ 0
100
Target Range
0 to Full Scale Count
†
0
Retry Value
1 to 255 3
Notes on Positioning Data
!
Overshoot Offset, Low Speed Offset, Stop Offset, and Target Range are defined as being
relative to the Target Position and are programmed as absolute values. If the Positioning
Direction Bit defines a positive approach, the values are added to the Target Position. If the
Positioning Direction Bit defines a negative approach, the values are subtracted from the
Target Position.
!
The Positioning Direction Bit defines the direction of the approach to the Target Position,
either a positive or neagtive approach. It is possible for the starting position of the move
profile to be on the opposite side of the Target Position. (The starting position is less than
the Target Position and a positive approach is programmed, or visa versa.) If this is the
case, the 2762-17 will drive the motor to (Target Position ± Overshoot Offset) and remove
power. Once the motor has coasted to a stop, the 2762-17 completes the profile with the
defined approach.
!
Setting the Low Speed Offset to zero disables high speed motion.
!
The range checking listed in the above table is performed when the data is entered.
However the data may not define a valid profile. As an example, (Target Position +
Overshoot Offset) may exceed the Upper Travel Limit. Profile checking is not performed
until a profile move is requested. If the profile cannot be performed, a Profile Error message
is sent to the processor through the single transfer input data. For more information on the
single transfer input data refer to
Single Transfer Input Data,
chapter 7, page 66.
!
The Retry Value applies only to move profiles initiated from the backplane.
† FSC: Full Scale Count = (Transducer Type {100 or 180} * (Scale Factor/Number of Turns)) - 1