PLCs, Power Supplies & Others

This power supply module delivers stable DC voltage to the entire S7-400 backplane. It converts 120/230 V AC input into regulated 5 V and 24 V DC outputs. The unit provides reliable power for all connected I/O and communication modules. Users can depend on consistent performance across demanding industrial environments.

Input Voltage Range and Power Conversion

This module accepts a wide AC input range from 85 V to 264 V for global compatibility. It also accommodates 110 V to 300 V DC input for battery-backed industrial systems. The conversion efficiency reaches 91% under typical load conditions. This high efficiency reduces heat generation and energy costs. Consequently, the unit extends the service life of nearby electronic components.

Backplane Power Distribution and Capacity

The 6EP1931-2FC21 supplies 10 A at 5 V DC for all logic modules in the S7-400 rack. It also provides 1 A at 24 V DC for output modules and field devices. The total combined output power reaches 74 W under continuous operation. This capacity supports a fully populated S7-400 chassis with multiple I/O modules. Moreover, the module includes internal current limiting for each output rail. This protection prevents damage from accidental overloads or short circuits.

Energy Storage and Ride-Through Performance

This power supply features a hold-up time of 20 ms at full load with 120 V AC input. During momentary voltage dips, the module maintains output regulation without interruption. This ride-through capability prevents processor resets during brief power disturbances. The unit also incorporates a built-in active inrush current limiting circuit. This feature prevents excessive current draw during power-up sequences. Consequently, the module protects both itself and connected components.

Cooling Design and Environmental Durability

The module uses natural convection cooling without any internal fans. This design eliminates mechanical failure points for higher reliability. The operating temperature ranges from 0 °C to 60 °C for most industrial environments. Humidity tolerance spans 5% to 95% without condensation issues. Furthermore, the module carries an IP20 rating for protection against solid objects. Its rugged construction suits automotive assembly and process control applications.

Diagnostic Indicators and Status Monitoring

Three front-panel LEDs provide clear visual status feedback for operators. A green “Power” LED confirms the presence of both output voltages. An “OK” LED signals normal operation and proper regulation. A red “Fault” LED illuminates during overvoltage or overtemperature events. These indicators simplify troubleshooting without external measurement tools. Moreover, the module provides remote signaling capability for centralized monitoring.

Installation and Mechanical Compatibility

This power supply fits directly into any standard S7-400 rack slot. The unit slides into the chassis and locks securely in place. A built-in handle facilitates easy removal during maintenance procedures. The module aligns with the S7-400 backplane connector automatically. This design ensures reliable electrical contact with the backplane bus. The rugged metal housing provides excellent electromagnetic shielding.

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