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Delta Tau: PMAC VME
The PMAC VME offers high performance control capabilities to the robust and highly expandable VME bus format, providing up to 8 axes of control in velocity or torque mode. See the Features tab for more details on this controller's hardware and software functionality.
Hardware Features
20 MHz DSP56002 CPU
128K x 24 1 wait-state battery-backed SRAM
128K x 8 PROM memory for firmware storage
2K x 8 EEPROM memory for setup variable backup
Latest released firmware version
RS-422 serial interface, VME bus interface
4 channels axis interface circuitry, each including:
16-bit +/-10V analog output
3-channel (A, B, C) differential/single-ended encoder input
4 input flags, 2 output flags
Interface to external 16-bit serial ADC
Display, control panel, muxed I/O, direct I/O interface ports
Buffered expansion port
Clock crystal with +/-100 ppm accuracy
PID/notch/feedforward servo algorithms
1-year warranty from date of shipment
Software Features
Trajectory Generation Features
Linear interpolation mode with S-curve accel/decel
Circular interpolation mode with S-curve accel/decel
Rapid point-to-point move mode
Cubic B-spline interpolation mode
Cubic Hermite-spline (PVT) interpolation mode
Automatic move-until-trigger functions with hardware capture
Interactive jog moves
Optional multi-move look ahead for velocity and acceleration limiting
Servo Features
Standard digital PID feedback filter
Velocity, acceleration, and friction feedforward
2nd-order notch/low-pass filter
Gains changeable at any time
Programmable input, integrator, and output limits
Optional 35-term âpole-placementâ servo filter
Commutation Features
Sinusoidal commutation of AC servo motors
Vector control of AC induction motors
Digital current-loop closure with direct PWM output (PMAC2)
Compensation Features
Position compensation tables (1D & 2D)
Torque compensation tables
Backlash compensation
Tool radius compensation
Safety Features
Hardware and software over travel limits
Amplifier enable/fault handshaking
Following error limits
Integrated current limit
Encoder loss detection (some versions)
Watchdog timer
Program and communications checksums
Computational Features
Real-time multi-tasking operating system
48-bit floating-point math for user programs
Trigonometric and transcendental functions
Automatic type-matching of different variable types
Feedback sensor types that can be processed
Coordination and Master/Slave Features
User-defined coordinate systems for automatic coordination of axes
Separate coordinate systems for independent motion of axes
Multi-motor axis support (e.g. gantries)
Dynamic axis transformations (e.g. offsets, rotations, mirroring)
Electronic gearing (no programming required)
Electronic cams with programmable profiles
Motion Program Features
High-level programming language
Automatic sequenced execution of moves
Calculations and I/O synchronous to motion
Axes programmed in user engineering units
Motion values as constants or expressions
Automatic coordination of multiple axes
Ability to execute G-code programs
PLC Program Features
Execution asynchronous to programmed motion
I/O control as in hardware PLC
Executive functions for standalone applications
Safety and status monitoring
Servo gain scheduling
Data reporting functions
Access to all registers in controller
Additional Axes
OPT-1V - 4 additional channels axis interface circuitry
OPT-7V - Plate mounting for standalone applications
Communication Options
OPT-2V - On-board 8Kx16 Dual Ported RAM
Processor and Firmware Options
OPT-10 - Firmware version specification
OPT-5AF - 40mHz CPU
OPT-5CF - 80 MHz CPU
OPT-5CL - 80MHz DSP56303 CPU (8Kx24 internal memory)
OPT-5EF - 160 MHz DSP563xx CPU
Connector Options
OPT-3V - Extended VME front plate for additional 5 connectors
Additional Options
OPT-3VG - Enclosed plastic PLC style front plate
Baseboard Options
OPT-0 - Removal of VME interface (for standalone applications)
OPT-14 - Replacement of flag opto isolators with socketed shunts
OPT-15 - V-to-F Converter to use Control Port Analog Input
OPT-16 - 16K x 24 battery-backed parameter RAM
OPT-8A - High-accuracy clock crystal (+/-15ppm)