The FX2N-10PG is Mitsubishi Electric’s high-speed 2-axis positioning special function module for the MELSEC FX2N compact PLC series, providing differential line driver pulse output at up to 1 MHz per axis — ten times the 100 kHz capability of the FX2N-1PG-E — for high-speed servo drive positioning in demanding FX2N-based motion control applications where maximum axis speed and differential signal noise immunity are essential requirements. As the premium positioning module for the FX2N platform, the FX2N-10PG provides RS-422A differential pulse output compatible with the most demanding servo amplifier pulse input specifications, enabling high-speed positioning at velocities that open-collector pulse modules cannot achieve. In stock at Atlantech Drives. Request your quote within 24-48 hours with worldwide shipping and 12-month warranty.
What Is the FX2N-10PG?
The FX2N-10PG is a MELSEC FX2N series special function module providing two axes of high-speed differential pulse output positioning, each capable of generating RS-422A differential step/direction or CW/CCW pulse signals at up to 1 MHz. The module installs in the FX2N extension bus and communicates with the FX2N CPU via FROM/TO buffer memory instructions — the FX2N program writes positioning commands to the module’s command registers using TO instructions, and the module’s onboard positioning processor executes the position move autonomously, returning status and position data via FROM instructions for the FX2N program to read. The FX2N-10PG stores up to 200 positioning patterns per axis in non-volatile module memory — twice the 100-pattern capacity of the FX2N-1PG-E — enabling complex multi-step position profiles for each axis. The differential RS-422A output provides inherent common-mode noise rejection, enabling cable runs of up to 10 m to servo amplifiers in electrically noisy industrial environments where open-collector pulse signals would suffer from induced interference at high pulse frequencies. The 1 MHz maximum output frequency enables linear servo motor speeds of approximately 3,000 RPM with a 131,072 pulse/revolution (17-bit encoder equivalent) servo — substantially beyond what open-collector modules can reliably achieve.
Key Technical Specifications
- Model: FX2N-10PG
- Controlled Axes: 2 (independent)
- Output Type: Differential line driver RS-422A, step/direction or CW/CCW
- Maximum Output Pulse Frequency: 1 MHz per axis
- Minimum Output Pulse Frequency: 1 Hz
- Positioning Patterns per Axis: 200
- Position Data Range: -2,147,483,648 to +2,147,483,647 pulses
- Speed Range: 1 Hz to 1 MHz
- Acceleration/Deceleration: Trapezoidal and S-curve (selectable per move)
- Interpolation: Linear 2-axis interpolation
- Manual Operation: JOG, inching, manual pulse generator input
- External Signals: Near-point DOG, upper/lower limit switches (per axis)
- Extension Bus Occupation: 8 I/O points
- External Power Supply: 24 VDC ±10%, 300 mA (required)
- Operating Temperature: 0°C to 55°C
- Weight: Approx. 0.22 kg
Series Comparison & Selection Guide
The FX2N positioning module range spans three capability levels: the FX2N base unit’s built-in Y0 pulse output (20 kHz, open-collector, single axis, no onboard positioning controller), the FX2N-1PG-E (100 kHz, open-collector, single axis, 100 patterns, FX2N extension bus module), and the FX2N-10PG (1 MHz, differential RS-422A, 2 axes, 200 patterns, S-curve acceleration, linear interpolation). The FX2N-10PG is the correct selection when any of these conditions apply: the required axis speed exceeds 100 kHz pulse frequency; the servo drive requires differential RS-422A pulse input for noise immunity or specification compliance; two coordinated axes with linear interpolation are required; or S-curve acceleration profiles are needed for smooth motion initiation and termination in precision applications. For single-axis applications with speeds below 100 kHz and open-collector-compatible servo drives, the FX2N-1PG-E provides adequate performance at lower cost. For applications requiring neither the 1 MHz speed capability nor differential output, the FX2N base unit’s built-in Y0 pulse output with DRVI/DRVA instructions provides the lowest-cost single-axis positioning solution within the FX2N platform. When migrating FX2N-10PG installations to current platforms, the MELSEC-Q QD75MH2 differential positioning module or the FX3U-20SSC-H SSCNET III/H servo adapter provide equivalent or superior positioning capability with current-generation platform support.
Installation Advice
The FX2N-10PG’s RS-422A differential pulse outputs require a specific wiring configuration to the servo amplifier — the differential pair (P+ and P- for pulse, D+ and D- for direction, or CW+ and CW- / CCW+ and CCW- for CW/CCW mode) must be connected with matched cable impedance and correct polarity. Use shielded twisted-pair cable rated for RS-422A communication (100 Ω characteristic impedance, 24 AWG minimum) for all differential signal connections — standard individual wires or unshielded parallel cables introduce impedance mismatches that cause reflections at 1 MHz pulse frequency, degrading signal integrity and causing missed pulses or false pulses at the servo amplifier. Connect the cable shield at the FX2N-10PG output terminal end only (not at the servo amplifier end) to prevent ground loops while maintaining shield effectiveness against electromagnetic interference. Verify the servo amplifier’s pulse input differential receiver specifications — most servo amplifiers with RS-422A pulse input use a 120 Ω line termination resistor at the receiver input. If the servo amplifier does not include internal termination, install a 120 Ω resistor across the differential pair at the servo amplifier end to prevent reflections on cable runs above 1 m. For the FX2N-10PG’s external 24 VDC power supply requirement (300 mA), use a supply dedicated to the FX2N-10PG and separated from the main 24 VDC field device supply — sharing the field device supply with the FX2N-10PG’s positioning circuit can introduce load-current-induced voltage transients that cause momentary positioning errors during solenoid valve activation.
Frequently Asked Questions
Q: Can the FX2N-10PG perform 2-axis linear interpolation for diagonal straight-line moves?
A: Yes. The FX2N-10PG supports 2-axis linear interpolation, generating coordinated differential pulse outputs on both axes simultaneously to move the controlled mechanism along a straight-line path between two points at the configured composite speed. The interpolation is executed by the module’s onboard positioning processor without CPU scan time involvement, providing smooth coordinated motion for XY table applications, gantry systems, and 2-axis engraving or dispensing machines.
Q: What is the practical maximum linear axis speed achievable with the FX2N-10PG at 1 MHz output and a standard servo motor?
A: At 1 MHz pulse output with a servo drive configured for 10,000 pulses per revolution (typical for a 2,500 line encoder with ×4 multiplication), the maximum motor speed is 1,000,000 ÷ 10,000 = 100 RPS = 6,000 RPM. For a ball screw with 10 mm pitch, 6,000 RPM corresponds to a maximum linear speed of 1,000 mm/s (1 m/s). This speed is within the capability of most medium-frame servo motors and represents a significant improvement over the 100 mm/s maximum achievable with the FX2N-1PG-E’s 100 kHz output at the same encoder resolution.
Q: Does the FX2N-10PG’s S-curve acceleration provide a tangible benefit over trapezoidal acceleration for most FX2N applications?
A: S-curve acceleration reduces the rate of change of acceleration (jerk) at the beginning and end of each acceleration and deceleration phase, producing smoother velocity transitions that reduce mechanical shock, vibration, and settling time compared to trapezoidal acceleration. The practical benefit is most significant for applications with flexible mechanical couplings, long ball screw or belt drives subject to resonance, and liquid dispensing or fragile component transport where abrupt acceleration changes cause sloshing or part displacement. For rigid mechanical systems with short move distances, the difference between S-curve and trapezoidal acceleration is less perceptible. S-curve mode is selected per positioning pattern via the acceleration type register in the FX2N-10PG buffer memory.
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