YOKOGAWA F3NC12-1N Position Control Module – FA-M3 Series

YOKOGAWA F3NC12-1N: Hardware-Timed Single-Axis Position Control in the FA-M3 Modular PLC Platform

The F3NC12-1N is a dedicated single-axis position control module engineered for YOKOGAWA’s FA-M3 Wide Series modular PLC architecture. Its core function within a motion control loop is to assume full responsibility for pulse-train generation and axis trajectory execution, offloading these tasks entirely from the FA-M3 CPU module. The module houses an onboard motion control ASIC that independently manages acceleration ramps, constant-velocity phases, deceleration profiles, and home-return sequences — all clocked from a local oscillator rather than the CPU’s task scheduler. This hardware separation is the architectural basis for the module’s deterministic output behavior: pulse frequency accuracy and profile fidelity are maintained regardless of CPU scan load, program size, or I/O service overhead.

In practical terms, the F3NC12-1N accepts positioning parameters — target position in pulses, command velocity in pulses per second, acceleration time constant in milliseconds — written by the CPU into a dual-port shared memory block on the module via the FA-M3 backplane bus. Once a start command is issued through the NC_MOVE or equivalent function block, the motion ASIC reads these parameters and executes the move autonomously. The CPU is released immediately to continue processing other ladder rungs, analog I/O, and communication tasks. The module reports axis status — in-position, alarm code, current command position, active input states — back to the CPU through the same shared register map, readable within one CPU scan cycle. This handoff model is what allows multi-axis FA-M3 systems to achieve coordinated motion across several F3NC12-1N modules without CPU throughput becoming a bottleneck.

The output stage drives a servo drive or stepper driver via open-collector NPN transistor outputs, supporting both CW/CCW dual-pulse mode and Pulse+Direction single-pulse mode. Maximum output frequency is 500 kpps (500,000 pulses per second), which at a typical servo drive electronic gear ratio of 1:1 corresponds to a command resolution of 500,000 encoder counts per second — sufficient for high-speed positioning in semiconductor handling, precision dispensing, and high-throughput assembly automation. The module occupies a single FA-M3 slot and draws 0.5 A at 5 VDC from the backplane power bus, making it compatible with standard FA-M3 power supply modules without derating calculations in typical multi-module configurations.

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Technical Parameters

Hardware Logical Analysis

Motion ASIC and Dual-Port Shared Memory Interface. The F3NC12-1N’s motion control ASIC is the functional core of the module. It maintains an internal position counter, a velocity accumulator, and a profile state machine that transitions between acceleration, constant-velocity, and deceleration phases based on the configured ramp parameters. The ASIC’s clock source is independent of the FA-M3 CPU bus clock, which means pulse output timing is not subject to bus arbitration delays or CPU interrupt latency. The dual-port shared memory block — accessible simultaneously by the ASIC and the FA-M3 CPU — serves as the communication interface. The CPU writes command registers (target position, velocity, start/stop commands) and reads status registers (current position, speed, alarm word, input states) through this memory map. Access from the CPU side is synchronous with the FA-M3 backplane bus cycle, ensuring register reads and writes complete within a deterministic number of bus clock cycles.

Output Stage EMC Architecture. Each pulse output line is driven by an NPN open-collector transistor with a collector-emitter voltage rating compatible with 5–24 VDC servo drive input circuits. Transient voltage suppression (TVS) diodes are placed at the output connector to clamp inductive transients generated by long cable capacitance and drive input circuitry. The PCB layout separates the high-frequency pulse output section from the backplane logic section using a ground-plane partition, reducing capacitive coupling of switching noise into the backplane bus. The module’s metal housing is bonded to the FA-M3 rack ground rail, providing a low-impedance return path for shield currents and satisfying IEC 61000-4-4 (EFT/Burst, 2 kV) and IEC 61000-4-5 (Surge, 1 kV) immunity requirements without external filtering components.

Hardware Position Latch Mechanism. The LATCH input is connected directly to the ASIC’s interrupt capture logic, not to a firmware polling routine. On the rising edge of the LATCH signal, the ASIC captures the current value of the internal pulse counter into a dedicated latch register within one ASIC clock cycle — a latency measured in tens of nanoseconds rather than the microseconds typical of software interrupt service routines. This captured value is then available in the shared memory map for the CPU to read at the next scan. The mechanism is essential for applications such as flying-shear length control, registration mark detection in web printing, and encoder index synchronization, where the position at an external event must be recorded with accuracy that software polling cannot guarantee.

DOG-Method Home Return Execution. The home return sequence is managed entirely within the ASIC’s state machine. The sequence proceeds as follows: the axis accelerates to the configured high-speed search velocity and moves in the home direction; on detection of the DOG sensor leading edge (FLS or dedicated DOG input), the ASIC decelerates to the configured creep velocity; on the DOG trailing edge, the ASIC counts a configurable number of additional pulses (home offset) and then stops, setting the position counter to zero (or a configured home offset value). All velocity and offset parameters are written to the module’s configuration registers by the CPU before the home command is issued. Because the entire sequence executes in the ASIC, the CPU scan cycle has no influence on the repeatability of the home position — a critical requirement in applications where homing accuracy directly affects part quality or tooling clearance.

Limit and Stop Input Hardware Processing. The FLS (forward limit), RLS (reverse limit), and STOP inputs are wired to the ASIC’s hardware input logic. When any of these inputs activates, the ASIC immediately initiates a deceleration stop using the configured deceleration ramp, independent of the CPU scan cycle. The axis will not overshoot the limit position by more than the distance traveled during the deceleration ramp — a deterministic, calculable value. This hardware-level response is fundamentally different from a software limit check in a ladder program, where the response time is bounded by the CPU scan period plus interrupt latency, which can vary under heavy program load.

System Integration Benefits

• CPU Scan Decoupling: Pulse output timing is governed by the ASIC’s local oscillator, not the CPU scan clock. A 500 kpps output maintains frequency accuracy within the ASIC’s oscillator tolerance (typically ±0.01 %) regardless of whether the FA-M3 CPU scan time is 1 ms or 50 ms, eliminating the velocity ripple that characterizes software-generated pulse outputs under variable scan load.
• Standardized Function Block Interface: YOKOGAWA’s WideField3 programming environment provides pre-certified function blocks — NC_MOVE, NC_JOG, NC_HOME, NC_STOP, NC_STATUS — that map directly to the module’s register interface. Engineers implement complete motion sequences in ladder logic without writing custom pulse generation code, reducing development time and eliminating a class of timing-related programming errors.
• One-Scan Status Latency: In-position, alarm, and limit-active flags are updated in the module’s status registers every ASIC control cycle and are readable by the CPU within one FA-M3 scan. This bounded feedback latency allows ladder logic to sequence downstream operations — gripper actuation, conveyor release, inspection trigger — with timing precision tied to the CPU scan period rather than to unpredictable software interrupt response times.
• Linear Multi-Axis Scalability: Additional F3NC12-1N modules are installed in the same FA-M3 rack without changes to the power supply or backplane wiring. Each module occupies one slot and draws 0.5 A at 5 VDC. A standard FA-M3 rack with a 5 A backplane power budget supports up to ten F3NC12-1N modules simultaneously, allowing system expansion from single-axis to multi-axis configurations by adding modules and extending the ladder program.
• Broad Servo Drive Compatibility: The open-collector NPN pulse output is electrically compatible with the pulse input receivers of YASKAWA Σ-7, Mitsubishi MR-J4, Panasonic MINAS A6, Delta ASDA-B3, and other major servo drive families without signal conditioning hardware, provided the drive’s input voltage (5–24 VDC) and sink current specifications are within the module’s output ratings.
• Sub-Microsecond Event Position Capture: The hardware LATCH input captures the axis position at external events with latency in the tens-of-nanoseconds range, enabling flying-shear synchronization, label registration, and encoder marker detection with accuracy that is independent of CPU scan time or operating system scheduling.
• Hardware-Enforced Axis Safety: Limit and stop inputs are processed in the ASIC, not in ladder logic. Axis deceleration on limit activation is bounded by the configured ramp and is independent of CPU response time, providing a safety layer that remains effective even when the CPU is executing a long scan or servicing a communication interrupt.
• Real-Time Diagnostic Register Access: The module exposes current command position, current velocity, alarm code word, and all input pin states in readable registers accessible from the FA-M3 CPU at any scan. These values can be mapped directly to HMI data tags or SCADA historian points, providing continuous axis diagnostics without additional diagnostic hardware or dedicated diagnostic scan programs.

Quality Assurance & Global Logistics

Each F3NC12-1N unit offered through siemensplc.com is sourced as genuine YOKOGAWA original equipment, manufactured at YOKOGAWA Electric Corporation’s production facilities operating under ISO 9001:2015 quality management certification. Factory acceptance testing at YOKOGAWA covers electrical performance verification, backplane communication integrity, pulse output frequency accuracy, and environmental stress screening. Modules are shipped from the factory in original YOKOGAWA packaging with intact production labels, date codes, and serial numbers that are traceable to YOKOGAWA’s manufacturing records.

At our Xiamen, China facility, each unit undergoes a secondary incoming inspection before being offered for sale. This inspection includes visual examination of the PCB, edge connector pins, and housing for any indication of damage, rework, or non-original components; power-on verification of backplane communication register access; and confirmation that hardware revision markings and firmware version identifiers are consistent with genuine YOKOGAWA production standards. Units that do not pass all inspection criteria are quarantined and removed from available inventory.

Export logistics are managed from Xiamen, a major international port in Fujian Province with established freight carrier relationships. Standard shipments are dispatched via DHL Express, FedEx International Priority, or UPS Worldwide Expedited, with typical door-to-door transit times of 3–7 business days to destinations in Europe, North America, Southeast Asia, the Middle East, and Australia. All shipments include a commercial invoice, packing list, and certificate of origin. Country-specific customs documentation — EUR.1 movement certificates, GSP Form A, or bilateral CO formats — is prepared upon request. Electronic modules are packed in ESD-safe anti-static bags with moisture barrier film, desiccant sachets, and foam-lined outer cartons rated for international air freight handling. A 12-month warranty from the date of shipment covers manufacturing defects under normal operating conditions as defined in YOKOGAWA’s standard warranty terms.

Contact Information

Email: [email protected]
WhatsApp: +86 18359268345
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Location: Xiamen, China
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