18
MC1241-Series Chipset Operational Parameters
Available configurations:
2 axes with internal mcrostepping generation (MC1241A)
1 axes with internal mcrostepping generation (MC1141A)
Open loop (motor is controlled directly by trajectory generator)
-1,073,741,824 to 1,073,741,823 usteps
-16,384 to 16,383 usteps/cycle with a resolution of 1/65,536 usteps/cycle
S-curve profile: - 1/2 to + 1/2 usteps/cycle2 with a resolution of 1/65,536 usteps/cycle2.
All others: -16,384 to 16,383 usteps/cycle2 with a resolution of 1/65,536 usteps/cycle2
-1/2 to +1/2 usteps/cycle3, with a resolution of 1/4,294,967,296 usteps/cycle3
-32,768 to +32,767 steps/cycle with a resolution of 1/65,536 steps/cycle
(used with trapezoidal and velocity profile modes only)
S-curve (host commands final position, max velocity, max acceleration, and jerk)
Trapezoidal (host commands final position, max velocity, starting velocity, and acceleration)
Velocity contouring (host commands max velocity, starting velocity, acceleration)
Electronic Gear (Encoder position is used as position command for corresponding axis).
32768:1 to 1:32768 (negative and positive direction)
A, B, Index
Sinusoidal
64
15 kHz
90 degrees (used with 2-phase stepper motors)
120 degrees (used with 3-phase stepper motors or AC Induction motors)
2 (all motor types)
97.6 kHz
8 bits
1.75 Mcounts/sec
540 uSec*
2 (one for each direction of travel)
Home switch input (one per axis)
2 (Index, Home signals)
160 nSec
80
Operating Modes:
Position Range:
Velocity Range:
Acceleration Range:
Jerk Range:
Start velocity range
Trajectory Profile Generator Modes:
Electronic Gear Ratio Range:
Encoder Input Signals:
Mcrostepping Waveform
#Steps Per Full Step:
Mcrostep Lookup Rate:
Phasing:
#of Output Phases:
PWMFrequency:
PWMresolution:
Max Incremental. Encoder Rate:
Profile Cycle Rate :
#of Limt Switch Inputs Per Axis
Mscellaneous control lines:
#of Position Capture Sources:
Capture Trigger Latency:
#of Host Commands:
*Exact cycle time is 542.72 uSec, 540 is an approximation
Trajectory Profile Generation
The trajectory profile generator performs calculations to determne the
target position, velocity and acceleration on a continuous basis. These
calculations are performed taking into account the current profile mode,
as well as the current profile parameters set by the host. Four trajectory
profile modes are supported:
- S-curve point to point
- Trapezoidal point to point
- Velocity contouring
- Electronic Gear
The commands to select these profile modes are
SET_PRFL_S_CRV (to select the s-curve mode), SET_PRFL_TRAP
(to select the trapezoidal mode) SET_PRFL_VEL (to select the
velocity contouring mode) and SET_PRFL_GEAR (to select the
electronic gear mod).
Throughout this manual various command mnemonics will be
shown to clarify chipset usage or provide specific examples. See
the Host Communications section for a description of host
command nomenclature.