FX3U-2HSY-ADP is a 2-channel high-speed pulse output adapter for Mitsubishi Electric’s MELSEC FX3U and FX3UC series programmable logic controllers, providing two additional differential line driver pulse output channels at up to 200 kHz each for open-loop stepper motor or pulse-input servo drive control. The FX3U-2HSY-ADP complements the FX3U CPU’s built-in transistor pulse outputs (Y0–Y2, rated at 100 kHz) by adding higher-frequency differential outputs that are immune to the noise-induced false triggering common in single-ended pulse output wiring in servo-dense machine cabinets. The FX3U-2HSY-ADP is available through Atlantech Drives — quote within 24-48 hours, worldwide express shipping, 12-month warranty.
What Is the FX3U-2HSY-ADP?
The FX3U-2HSY-ADP is a left-side special adapter that mounts onto the FX3U or FX3UC CPU module and provides two independent high-speed pulse output channels, each capable of outputting differential RS-422 line driver pulse trains in pulse/direction (PULSE/SIGN) or CW/CCW (forward/reverse pulse) format. Each channel also includes a differential enable output signal, allowing direct connection to servo amplifiers that use a hardware enable input to arm the pulse input circuit before motion begins. The adapter is controlled from the FX3U CPU using the same DPLSY, DRVI, DRVA, and DSZR positioning instructions used for the built-in Y0–Y2 outputs, with the adapter channels addressed as virtual output devices Y060–Y063 in the FX3U device map. Up to two FX3U-2HSY-ADP adapters can be stacked, providing four additional high-speed pulse output axes beyond the CPU’s built-in three channels — yielding a maximum of 7 independent pulse output axes on a single FX3U CPU when both built-in and adapter outputs are used simultaneously.
Key Technical Specifications
- Number of Output Channels: 2 (independent axes)
- Output Signal Type: Differential line driver (RS-422), 5 V DC
- Maximum Output Frequency: 200 kHz per channel
- Output Modes: Pulse/Direction (PULSE/SIGN) or CW/CCW
- Enable Output: Differential enable signal per channel
- Positioning Instructions: DPLSY, DRVI, DRVA, DSZR, DDSZR (via CPU)
- Virtual Device Address: Y060–Y063 (first adapter), Y070–Y073 (second adapter)
- Maximum Adapters per CPU: 2 (total 4 additional pulse output axes)
- Power Supply: 5 V DC, 100 mA (from FX3U left-side bus)
- Compatible Base Units: FX3U, FX3UC (with FX3UC-1PS-5V)
- Operating Temperature: 0 °C to 55 °C
- Dimensions (W × H × D): 40 × 90 × 87 mm
- Weight: Approx. 155 g
Compatibility & System Integration
The FX3U-2HSY-ADP differential RS-422 pulse output is directly compatible with the pulse input terminals of Mitsubishi MR-J4-A (pulse input type), MR-J3-A, and MR-J2S-A servo amplifiers, as well as stepper motor drivers from Oriental Motor, Panasonic, and other manufacturers that accept RS-422 differential pulse input at 5 V signal levels. For servo amplifiers that accept only single-ended 24 V DC pulse input (such as some older Yaskawa Sigma-II or Omron G5 variants), a differential-to-single-ended pulse converter must be inserted between the FX3U-2HSY-ADP output and the amplifier input — direct connection of the 5 V differential output to a 24 V single-ended input will result in no motion and potential damage to the amplifier input circuit. When used alongside the FX3U-4HSX-ADP (high-speed input adapter) for closed-loop position verification, the adapter stack order on the left-side bus must be observed: adapters are addressed sequentially from the CPU outward, so if both adapter types are installed, their buffer memory address blocks must be mapped correctly in the FROM/TO read/write instructions. For multi-axis systems requiring true closed-loop servo control with electronic gearing and cam functions, Mitsubishi recommends upgrading to the QD77MS4 Simple Motion Module on a MELSEC-Q platform rather than extending the FX3U pulse output architecture beyond 4–5 axes.
Installation Advice
The FX3U-2HSY-ADP differential output connector uses a 26-pin MIL connector (two rows of 13 pins) — do not confuse this with the FX3U-4HSX-ADP input connector, which uses a similar housing but different pin assignment. Always use the wiring diagram in the FX3U-2HSY-ADP User’s Manual (JY997D31401) as the primary reference, not third-party wiring guides, as pin assignments between adapter revisions have changed. Shield the pulse output cable at the adapter end only, and route it in a separate cable duct from encoder feedback cables to prevent pulse output switching noise from coupling into the encoder signal lines — even with differential signalling, high-frequency pulse edges (200 kHz square waves with fast rise times) can induce crosstalk in parallel cable runs exceeding 500 mm. Set the servo amplifier’s pulse input filter (electronic filter parameter) to the minimum value compatible with the maximum pulse frequency in use — an overly aggressive input filter at 200 kHz operation will distort pulses and cause the amplifier to miscount position commands, producing cumulative position error over long travel distances. After wiring, verify correct operation by commanding a known number of pulses at low speed using the DPLSY instruction in manual mode and confirming the motor shaft rotation matches the expected step count before enabling automatic positioning routines.
Frequently Asked Questions
Q: Can the FX3U-2HSY-ADP outputs be used simultaneously with the FX3U’s built-in Y0, Y1, Y2 pulse outputs for independent axis control?
A: Yes. The FX3U-2HSY-ADP channels operate independently of the built-in transistor pulse outputs. Y0, Y1, and Y2 on the base unit can each run independent positioning instructions simultaneously with the two adapter channels, giving a total of 5 independent pulse output axes on a single FX3U CPU with one FX3U-2HSY-ADP installed. With two adapters stacked, this rises to 7 axes. Each axis runs its positioning instruction independently in the ladder program.
Q: Is it possible to perform linear interpolation between a built-in Y0 axis and an FX3U-2HSY-ADP axis?
A: No. The FX3U positioning instruction set does not support interpolation between built-in transistor outputs and adapter pulse outputs — interpolation functions (such as DDRVI with 2-axis simultaneous output) only operate between channels of the same output hardware group. For multi-axis linear or circular interpolation, Mitsubishi recommends the QD77MS4 or FX5U with built-in high-speed outputs as the appropriate platform.
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