Implementing 3-Switch XOR Ladder Logic with Internal Bit
Implement a 3-SPST switch XOR light circuit in LogixPro or RSLogix 500 using an internal relay bit. Includes truth tables, boolean equations, and verified.
Designed for high-accuracy multi-axis positioning, the QD77MS2 serves as a reliable 2-axis simple motion module within the MELSEC-Q Series PLC platform. Operating on the high-speed optical network SSCNET III/H, this module provides seamless synchronization and noise-immune communication with compatible Mitsubishi servo drives, such as the MR-J4 series. It integrates sophisticated motion control functions—including linear interpolation, circular interpolation, and advanced synchronous control—into a compact, standard Q-Series form factor.
The module is engineered to offload complex path calculations and speed-position switching tasks from the main CPU, ensuring consistent cycle times and high system responsiveness. Setup, parameter configuration, and diagnostic monitoring are easily managed using GX Works2 software, streamlining the engineering workflow for OEM machine builders and system integrators alike.
| Manufacturer | Mitsubishi Electric |
| Model/Part Number | QD77MS2 |
| Series | MELSEC-Q Series |
| Module Type | Simple Motion Module |
| Number of Control Axes | 2 axes |
| Communication Interface | SSCNET III/H (Optical fiber) |
| Communication Speed | 150 Mbps |
| Control System | PTP (Point-to-Point) control, Path control (Linear, Circular), Speed control, Speed-position switching, Position-speed switching |
| Max. Cable Distance | Up to 100 m between stations |
| Internal Current Consumption | 0.6 A (at 5 VDC) |
| Dimensions | 98 mm (H) x 27.4 mm (W) x 90 mm (D) |
| Weight | 0.15 kg |
| Operating Temperature | 0 to 55 degC |
| Storage Temperature | -25 to 75 degC |
| Interface/Connector | Function / Description |
|---|---|
| SSCNET III/H Port | Optical connector for high-speed fiber-optic link to servo amplifiers |
| External Input Connector | 40-pin connector for external signals (FLS, RLS, DOG, STOP) |
| Backplane Connector | Standard MELSEC-Q series bus interface for PLC CPU communications and power |
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Returns & Warranty

Designed for high-accuracy multi-axis positioning, the QD77MS2 serves as a reliable 2-axis simple motion module within the MELSEC-Q Series PLC platform. Operating on the high-speed optical network SSCNET III/H, this module provides seamless synchronization and noise-immune communication with compatible Mitsubishi servo drives, such as the MR-J4 series. It integrates sophisticated motion control functions—including linear interpolation, circular interpolation, and advanced synchronous control—into a compact, standard Q-Series form factor.
The module is engineered to offload complex path calculations and speed-position switching tasks from the main CPU, ensuring consistent cycle times and high system responsiveness. Setup, parameter configuration, and diagnostic monitoring are easily managed using GX Works2 software, streamlining the engineering workflow for OEM machine builders and system integrators alike.
| Manufacturer | Mitsubishi Electric |
| Model/Part Number | QD77MS2 |
| Series | MELSEC-Q Series |
| Module Type | Simple Motion Module |
| Number of Control Axes | 2 axes |
| Communication Interface | SSCNET III/H (Optical fiber) |
| Communication Speed | 150 Mbps |
| Control System | PTP (Point-to-Point) control, Path control (Linear, Circular), Speed control, Speed-position switching, Position-speed switching |
| Max. Cable Distance | Up to 100 m between stations |
| Internal Current Consumption | 0.6 A (at 5 VDC) |
| Dimensions | 98 mm (H) x 27.4 mm (W) x 90 mm (D) |
| Weight | 0.15 kg |
| Operating Temperature | 0 to 55 degC |
| Storage Temperature | -25 to 75 degC |
| Interface/Connector | Function / Description |
|---|---|
| SSCNET III/H Port | Optical connector for high-speed fiber-optic link to servo amplifiers |
| External Input Connector | 40-pin connector for external signals (FLS, RLS, DOG, STOP) |
| Backplane Connector | Standard MELSEC-Q series bus interface for PLC CPU communications and power |
Global Express Shipping
Returns & Warranty
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For full eligibility, restocking fees, and international return details, please view our official Refund & Return Policy .
| Country of origin |
United States
|