DELTA TAU PMAC2 CPU

Ultra-short microsecond-level servo closed-loop control cycle, real-time reading of motor encoder position feedback signals, automatic calculation of position, velocity and torque adjustment output values through configurable PID servo algorithms, realizing stable low-following-error high-precision axis positioning and multi-axis synchronous contour machining motion.

Built-in complete set of industry-standard advanced motion functions to meet complex automation equipment motion requirements: multi-axis continuous synchronous contour cutting for CNC machine tools, electronic gear ratio synchronization for printing rotary roller equipment, electronic cam curve following for high-speed packaging filling equipment, high-speed product position registration capture for automated testing sorting equipment.

Parallel operation of PLC logic programs independent of high-speed motion control cycles, responsible for processing all equipment auxiliary interlock logic: travel limit switch signal detection, emergency stop safety circuit interlock, solenoid valve and air cylinder auxiliary mechanical action automatic control, equipment operation fault judgment and alarm signal output. No external independent PLC hardware is required for complete equipment logic control.

Dual servo output modes supported without hardware modification: analog ±10V voltage signal output compatible with all mainstream analog servo and stepper drives; digital fieldbus communication expansion module access to digital bus servo drives, realizing high-speed digital encoder feedback and multi-axis synchronous digital motion control.

Modular expandable I/O hardware architecture, users can freely add digital input/output expansion boards for limit switches, proximity sensors, indicator lights and actuators, as well as analog signal acquisition expansion modules for pressure, temperature, flow analog transmitters, to match different equipment signal detection and actuation point quantity demands.

Multiple communication channels can work simultaneously: serial port offline program downloading and equipment debugging, industrial Ethernet real-time bidirectional data exchange with touch screen HMI and upper SCADA monitoring host computer, realizing real-time equipment motion state data uploading and remote motion command downloading from upper monitoring systems.

Continuous real-time monitoring of all motion axis operating states during equipment automatic operation: motion following error over-limit, servo drive fault feedback signal, positive/negative travel hard limit trigger, emergency stop circuit disconnection, motion program execution abnormal faults. Once any fault condition is triggered, the CPU immediately executes preset safety stop motion logic, locks servo output signals, outputs fault alarm signals to external indicator lights and stores complete fault codes, fault occurrence timestamps and corresponding axis motion state data into internal fault log memory for post-failure maintenance troubleshooting analysis.

The PMAC2 CPU main control module supports flexible addition of various function expansion hardware boards without replacing the main CPU module: multi-axis servo axis expansion cards, industrial communication bus expansion modules, digital/analog I/O expansion boards, pulse encoder signal expansion acquisition boards, adapting to equipment upgrade expansion requirements of increased motion axes or more signal detection points.

After the PMAC2 CPU module is connected to 24VDC industrial control power supply and powered on, the onboard dedicated motion control processor automatically executes full-system hardware self-inspection sequence: sequentially detecting communication port transceiver circuits, all encoder signal input channels, analog servo output circuits, digital I/O signal acquisition channels, internal program storage flash memory chip and expansion hardware slot connection status. After completing full hardware function self-test without fault codes, the processor loads all pre-stored motion programs, servo PID tuning parameters, PLC logic programs and equipment safety interlock configuration data from internal flash memory into real-time operating memory, then enters standby ready operation state, waiting for motion execution commands sent from HMI touch screen or PC host computer.

During normal equipment automatic operation, the CPU continuously collects three major categories of real-time signal data through multiple independent parallel signal acquisition channels:

Two completely independent parallel real-time calculation pipelines operate simultaneously inside the CPU processor, separating high-priority hard real-time motion control tasks and low-priority sequential logic processing tasks to eliminate computing resource scheduling conflicts and guarantee ultra-stable motion control cycle timing accuracy:

The dedicated motion control processor continuously runs high-frequency closed-loop servo calculation cycles. The pipeline receives real-time axis actual position feedback data from encoder circuits and target position coordinate data generated by the trajectory interpolation planning module, calculates position deviation (motion following error) between actual and target positions, then executes user-configurable PID position-velocity-torque three-layer servo control algorithms to generate real-time analog voltage or digital bus servo drive output control signals, transmitted to each servo drive to drive motor rotation. Simultaneously, the pipeline dynamically adjusts multi-axis synchronous motion target coordinate values according to electronic gearing, electronic cam and contour interpolation motion logic to realize coordinated multi-axis synchronous movement, and continuously monitors motion following error magnitude to judge axis motion over-limit fault conditions and trigger safety stop logic when fault thresholds are exceeded.

Parallel to the high-speed servo control pipeline, the CPU continuously cycles through the user-written PLC ladder logic program. The pipeline reads real-time digital and analog I/O field signal sampling data, executes sequential logic judgment, interlock condition comparison and auxiliary action timing control operations, outputs corresponding digital signal control values to drive solenoid valves, indicator lights and air cylinder actuators, judges equipment fault signal conditions and outputs fault alarm trigger signals to external alarm hardware, and synchronizes equipment operating state signal data to the upper HMI/SCADA monitoring system through communication ports.

The dual parallel calculation pipeline cyclic operation sequence runs uninterrupted for the full equipment automatic operation runtime. Built-in multi-layer safety protection monitoring logic continuously tracks three core equipment operating indicators in real time: each servo axis motion following error value, servo drive fault feedback signals, emergency stop and travel limit safety circuit state.

Once abnormal fault conditions are detected in any monitoring item, the CPU immediately executes multi-stage safety protection response logic in fixed priority order: first cut off all servo drive output control signals to stop all motor axis movement; second lock all new motion trajectory program execution commands; third output continuous fault alarm digital signal to external alarm light and buzzer hardware; fourth record complete fault code, fault occurrence timestamp and corresponding axis motion state data into internal fault log memory for later maintenance troubleshooting analysis. After maintenance personnel eliminate the root cause of the equipment fault and manually reset the fault state through the HMI touch screen or front panel reset button, the CPU clears the fault lockout state and resumes normal standby motion control operation.

Complete all equipment configuration programming work via official PMAC2 PC-side development software before powering the CPU module and connected servo drive hardware online: including all motion trajectory programs, multi-axis servo PID tuning parameter sets, PLC ladder logic interlock programs, digital/analog I/O signal allocation mapping tables and upper HMI communication data exchange parameter settings. Never modify core motion programs, servo PID parameters or safety interlock PLC logic while the production line equipment is running in automatic operation mode; real-time parameter modification during operation will trigger instantaneous servo output signal fluctuation, leading to axis motion jitter, product processing dimensional deviation or emergency equipment shutdown production interruption losses.

When configuring multi-axis coordinated motion electronic gearing, electronic cam and contour interpolation functions, strictly match data type, coordinate byte length and axis memory offset parameters between each motion axis; mismatched numerical data configuration will generate distorted motion target coordinate values, causing abnormal axis vibration, motion positioning deviation and product processing scrapping faults.

After completing all wiring installation work, carry out full equipment offline safety function testing before enabling automatic production operation: manually trigger positive/negative travel limit switches and emergency stop buttons one by one to verify the CPU module can immediately cut off servo motor output and lock motion program execution, confirm all safety interlock protection functions work normally to eliminate personnel mechanical injury and equipment collision damage hidden dangers.

Carry out servo auto-tuning operation for each independent motion axis after wiring and offline safety testing are completed before formal production equipment operation. Adjust PID servo proportional/integral/derivative parameters according to actual mechanical load characteristics of each axis to eliminate axis motion vibration, overshoot positioning impact and excessive motion following error problems during high-speed movement operation.

The CPU module must remain installed inside fully sealed dust-proof electrical control cabinets with closed cabinet doors during all production automatic operation periods; opening cabinet doors for long-term operation will lead to dust and oil mist contamination of internal circuit hardware and accelerated hardware failure risks.

Minimize frequent repeated power cycle operation of the entire equipment control cabinet power supply (including the PMAC2 CPU module); each full equipment power-off shutdown waiting interval must last minimum 45 seconds before re-powering the control cabinet. This waiting period allows all internal large-capacity power supply filter capacitors inside the CPU module and servo drive hardware to fully discharge, preventing instantaneous power-on voltage surge impact from damaging the CPU internal high-speed motion control processor chip and flash memory program storage chip, which will cause program file corruption and equipment motion control function loss.

Semi-annual comprehensive equipment control cabinet maintenance cycle rules: Every six months of continuous production line equipment operation, carry out full dust cleaning maintenance for the PMAC2 CPU module and all matched servo drive and I/O expansion hardware. Use dry low-pressure compressed air with air pressure strictly controlled below 0.3MPa to blow accumulated dust off the module front panel wiring terminal blocks, ventilation heat dissipation gaps and internal rack-mounted hardware surfaces. Strictly prohibit using alcohol, acetone, thinner, water or any liquid chemical cleaning agents to wipe the CPU module metal housing, front panel indicator lights and wiring terminal blocks; liquid solvents will corrode plastic terminal insulation materials, metal conductive contact tin coating layers and circuit board protective solder mask coating, accelerating terminal oxidation and circuit board solder joint corrosion failure.

Configuration file backup update rule: Every time maintenance personnel modify any motion program, servo PID tuning parameters, PLC interlock logic or communication exchange parameter settings on production equipment, immediately connect the PC development software to export and save a complete full equipment configuration backup file. Store at least one offline backup copy of the latest complete configuration file in the workshop equipment maintenance computer hard disk, and reserve a spare USB flash drive storage backup copy on-site at each production line control cabinet for emergency rapid CPU module hardware replacement and configuration file recovery work when the original CPU module fails and needs to be replaced.

Standardized step-by-step fault troubleshooting process when module fault indicator light flashes red during equipment operation:

Step 1: Inspect the 24VDC control power supply input voltage stability first, check front panel power wiring terminal blocks for