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.
Engineered for precise speed and torque control in three-phase industrial environments, the Mitsubishi Electric FR-E840-0120-4-60 serves as a highly reliable 400V class variable frequency drive within the FR-E800 series portfolio. This compact inverter is rated for a Normal Duty (ND) current of 12.0 A, delivering robust performance under heavy cyclic loads. Designed to thrive in demanding automation settings, this unit includes standard conformally coated circuit boards to guard against atmospheric contaminants and moisture, making it an excellent match for material handling, HVAC, and pumping operations. Utilizing Source logic for its control and safety stop inputs, it integrates smoothly into standard safety-instrumented systems requiring high uptime and predictable safety response.
| Parameter | Specification Value |
|---|---|
| Manufacturer | Mitsubishi Electric |
| Model Number | FR-E840-0120-4-60 |
| Series Name | FR-E800 (FR-E8) |
| Voltage Class | 400 V Class (Three-Phase Input) |
| Inverter ND Rated Current | 12.0 A |
| Rated Frequency (Initial Setting) | 50 Hz |
| Input Signal (Initial Status) | Source logic |
| Safety Stop Signal Logic | Source logic (Fixed) |
| Monitoring Interface | Voltage (Terminal AM) |
| Circuit Board Coating | Conformally coated boards (with coating) |
| Plated Conductor | Without plated conductors |
| Cooling Type | Forced Air Cooling |
| Net Weight | 2.4 kg |
| Shipping Weight (Calculated) | 5.0 kg |
| Terminal Symbol | Terminal Name | Description / Signal Allocation |
|---|---|---|
| R/L1, S/L2, T/L3 | Main Circuit Power Input | Connects to the three-phase AC power supply (380 to 480 V AC, 50 Hz / 60 Hz). |
| U, V, W | Inverter Output Terminals | Connects to the three-phase induction or permanent magnet motor. |
| AM | Analog Monitor Output | Provides analog voltage output (0 to 10 VDC) for monitoring parameter values. |
| PC | External Transistor Common | Acts as the 24 VDC common power supply source for digital inputs (Source logic configuration). |
| S1, S2, SIC | Safety Input Terminals | Used for functional safety shutdown loops (STO) in compliance with SIL2/SIL3 standards. |
When migrating legacy systems from the older FR-E740-120-EC or FR-E740-120-NA, the newer FR-E840-0120-4-60 offers matching physical mounting dimensions but incorporates advanced safety logic and enhanced parameter groups. Be sure to backup your original parameters via FR Configurator2 software. When downloading to the FR-E840, some advanced motor constants may need manual conversion if operating older non-standard permanent magnet motors.
Operating this inverter inside tightly enclosed, sealed panels can result in localized thermal build-ups. Ensure that surrounding clearance parameters (minimum 50 mm above and below, 20 mm on the sides) are strictly maintained to permit effective convection. When wiring safety inputs (S1 and S2), note that the safety stop terminal logic is fixed to Source logic. Attempting to use a 0V common path to control safety circuits on this specific model variant will cause hard safety interlock faults (e.g., SA status fault indication).
To minimize high-frequency electromagnetic interference (EMI) on the analog AM monitoring terminal, always utilize a separate shielded twisted pair (STP) cable for control signals. Ground the shield at the inverter side only, specifically to the dedicated control ground terminal. If the motor cables exceed 30 meters in length, install an output dV/dt filter or reduce the carrier frequency (Pr. 72) to prevent excessive leakage currents and premature insulation aging in the motor windings.
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Returns & Warranty

Engineered for precise speed and torque control in three-phase industrial environments, the Mitsubishi Electric FR-E840-0120-4-60 serves as a highly reliable 400V class variable frequency drive within the FR-E800 series portfolio. This compact inverter is rated for a Normal Duty (ND) current of 12.0 A, delivering robust performance under heavy cyclic loads. Designed to thrive in demanding automation settings, this unit includes standard conformally coated circuit boards to guard against atmospheric contaminants and moisture, making it an excellent match for material handling, HVAC, and pumping operations. Utilizing Source logic for its control and safety stop inputs, it integrates smoothly into standard safety-instrumented systems requiring high uptime and predictable safety response.
| Parameter | Specification Value |
|---|---|
| Manufacturer | Mitsubishi Electric |
| Model Number | FR-E840-0120-4-60 |
| Series Name | FR-E800 (FR-E8) |
| Voltage Class | 400 V Class (Three-Phase Input) |
| Inverter ND Rated Current | 12.0 A |
| Rated Frequency (Initial Setting) | 50 Hz |
| Input Signal (Initial Status) | Source logic |
| Safety Stop Signal Logic | Source logic (Fixed) |
| Monitoring Interface | Voltage (Terminal AM) |
| Circuit Board Coating | Conformally coated boards (with coating) |
| Plated Conductor | Without plated conductors |
| Cooling Type | Forced Air Cooling |
| Net Weight | 2.4 kg |
| Shipping Weight (Calculated) | 5.0 kg |
| Terminal Symbol | Terminal Name | Description / Signal Allocation |
|---|---|---|
| R/L1, S/L2, T/L3 | Main Circuit Power Input | Connects to the three-phase AC power supply (380 to 480 V AC, 50 Hz / 60 Hz). |
| U, V, W | Inverter Output Terminals | Connects to the three-phase induction or permanent magnet motor. |
| AM | Analog Monitor Output | Provides analog voltage output (0 to 10 VDC) for monitoring parameter values. |
| PC | External Transistor Common | Acts as the 24 VDC common power supply source for digital inputs (Source logic configuration). |
| S1, S2, SIC | Safety Input Terminals | Used for functional safety shutdown loops (STO) in compliance with SIL2/SIL3 standards. |
When migrating legacy systems from the older FR-E740-120-EC or FR-E740-120-NA, the newer FR-E840-0120-4-60 offers matching physical mounting dimensions but incorporates advanced safety logic and enhanced parameter groups. Be sure to backup your original parameters via FR Configurator2 software. When downloading to the FR-E840, some advanced motor constants may need manual conversion if operating older non-standard permanent magnet motors.
Operating this inverter inside tightly enclosed, sealed panels can result in localized thermal build-ups. Ensure that surrounding clearance parameters (minimum 50 mm above and below, 20 mm on the sides) are strictly maintained to permit effective convection. When wiring safety inputs (S1 and S2), note that the safety stop terminal logic is fixed to Source logic. Attempting to use a 0V common path to control safety circuits on this specific model variant will cause hard safety interlock faults (e.g., SA status fault indication).
To minimize high-frequency electromagnetic interference (EMI) on the analog AM monitoring terminal, always utilize a separate shielded twisted pair (STP) cable for control signals. Ground the shield at the inverter side only, specifically to the dedicated control ground terminal. If the motor cables exceed 30 meters in length, install an output dV/dt filter or reduce the carrier frequency (Pr. 72) to prevent excessive leakage currents and premature insulation aging in the motor windings.
Global Express Shipping
Returns & Warranty
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| Country of origin |
United States
|