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 to deliver high-performance motion control within the MELSEC-L PLC architecture, the LD77MS2 serves as a dedicated multi-axis Simple Motion Module. This unit facilitates ultra-precise positioning, synchronized control, and electronic cam profiles by leveraging the high-speed capabilities of the SSCNET III/H fiber-optic network.
Equipped with a single-system SSCNET III/H connection, the module provides reliable control for up to two motion axes. It incorporates dual high-speed digital input points featuring photocoupler isolation, designed to handle registration marks and limit inputs with minimal response delay. The direct fiber-optic link ensures complete noise immunity and fast cyclic updates between the PLC and servo amplifiers, making it ideal for high-throughput machinery.
| Manufacturer | Mitsubishi Electric |
| Part Number / Model | LD77MS2 |
| Product Series | MELSEC-L Series |
| Module Type | Simple Motion Module |
| Servo Amplifier Connection System | SSCNET III/H (1 system) |
| Number of Input Points | 2 points |
| Input Connection Method | Positive common / Negative common shared (Photocoupler) |
| Rated Input Voltage | 24 VDC |
| Rated Input Current | Approx. 5 mA |
| Operating Voltage Range | 21.6 to 26.4 VDC (24 VDC +/-10 percent, ripple ratio 5 percent or less) |
| ON Voltage / Current | 17.5 VDC or more / 3.5 mA or more |
| OFF Voltage / Current | 5 VDC or less / 0.9 mA or less |
| Input Resistance | Approx. 5.6 kohm |
| Response Time | 1 ms or less |
| Recommended Wire Size | AWG24 (0.2 mm2) |
| Internal Current Consumption (5 VDC) | 0.55 A |
| Net Mass | 0.22 kg |
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Returns & Warranty

Designed to deliver high-performance motion control within the MELSEC-L PLC architecture, the LD77MS2 serves as a dedicated multi-axis Simple Motion Module. This unit facilitates ultra-precise positioning, synchronized control, and electronic cam profiles by leveraging the high-speed capabilities of the SSCNET III/H fiber-optic network.
Equipped with a single-system SSCNET III/H connection, the module provides reliable control for up to two motion axes. It incorporates dual high-speed digital input points featuring photocoupler isolation, designed to handle registration marks and limit inputs with minimal response delay. The direct fiber-optic link ensures complete noise immunity and fast cyclic updates between the PLC and servo amplifiers, making it ideal for high-throughput machinery.
| Manufacturer | Mitsubishi Electric |
| Part Number / Model | LD77MS2 |
| Product Series | MELSEC-L Series |
| Module Type | Simple Motion Module |
| Servo Amplifier Connection System | SSCNET III/H (1 system) |
| Number of Input Points | 2 points |
| Input Connection Method | Positive common / Negative common shared (Photocoupler) |
| Rated Input Voltage | 24 VDC |
| Rated Input Current | Approx. 5 mA |
| Operating Voltage Range | 21.6 to 26.4 VDC (24 VDC +/-10 percent, ripple ratio 5 percent or less) |
| ON Voltage / Current | 17.5 VDC or more / 3.5 mA or more |
| OFF Voltage / Current | 5 VDC or less / 0.9 mA or less |
| Input Resistance | Approx. 5.6 kohm |
| Response Time | 1 ms or less |
| Recommended Wire Size | AWG24 (0.2 mm2) |
| Internal Current Consumption (5 VDC) | 0.55 A |
| Net Mass | 0.22 kg |
Global Express Shipping
Returns & Warranty
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| Country of origin |
United States
|