Siemens 39PSR4ANDN Energy-Saving Power Supply for SIMATIC S5

Siemens 39PSR4ANDN Energy-Saving Power Supply for Optimized SIMATIC S5 Automation

The Siemens 39PSR4ANDN (16114-200/01) is a high-efficiency power supply module engineered for the SIMATIC S5 programmable controller platform. In modern industrial environments where energy costs and equipment uptime directly impact profitability, the power supply module is often the most overlooked component in the energy optimization chain. The 39PSR4ANDN addresses this gap by delivering stable, regulated DC power to the SIMATIC S5 backplane with minimal conversion loss, ensuring that every watt drawn from the grid is translated into productive control output rather than heat dissipation.

Factories running SIMATIC S5-115U, S5-135U, or S5-155U systems rely on consistent power delivery to maintain deterministic PLC scan cycles. Any voltage fluctuation or ripple at the power supply level propagates directly into CPU execution timing, I/O response latency, and ultimately production line throughput. The 39PSR4ANDN’s regulated output eliminates these instabilities, allowing the CPU 948, CPU 928B, or CPU 922 to execute ladder logic and function block programs at rated cycle times without protective shutdowns or watchdog resets that would otherwise halt the line.

Efficiency Performance Table

Energy-Aware Automation Architecture

The 39PSR4ANDN does not operate in isolation — it is the foundation upon which the entire SIMATIC S5 control architecture draws its operating energy. Understanding how it interacts with downstream components is essential for designing an energy-aware automation system.

At the control layer, the Siemens CPU 948 and CPU 928B are the primary processing units that depend on the 39PSR4ANDN’s 5V backplane rail. These CPUs execute the PLC program that governs motor start/stop sequences, conveyor speed references, and process interlocks. When the power supply delivers clean, stable voltage, the CPU maintains its programmed scan cycle without interruption, which means actuators and drives receive their setpoints on time — eliminating the micro-delays that accumulate into measurable production losses over a shift.

On the I/O side, Siemens SM 321 digital input modules and SM 322 digital output modules mounted in the same S5 rack draw their logic-level power from the same backplane supply. Unstable PSU output causes false input reads and output chatter, which in turn triggers unnecessary motor starts and stops — a hidden source of energy waste that the 39PSR4ANDN’s regulated design prevents.

For drive-level energy control, SIMATIC S5 systems are commonly paired with Siemens MICROMASTER 440 or SINAMICS G120 variable frequency drives. The PLC’s analog output modules — such as the SM 332 AO 4×12Bit — send speed reference signals to these drives. When the power supply is stable, the analog output accuracy is maintained, and the VFD operates the motor at precisely the commanded speed rather than hunting around the setpoint, which directly reduces motor energy consumption and mechanical wear.

At the communication layer, Siemens CP 5431 FMS/DP communication processors installed in the S5 rack rely on the 39PSR4ANDN for their operating power. These modules handle PROFIBUS DP fieldbus communication between the PLC and remote I/O stations, drives, and HMI panels such as the Siemens OP 17 operator panel. Reliable PSU output ensures that PROFIBUS telegram timing is maintained, preventing communication timeouts that would force the CPU into a safe-state stop and halt the production line.

For energy monitoring at the system level, the 39PSR4ANDN-powered S5 controller can be integrated with Siemens SENTRON PAC3200 power monitoring devices via Modbus or PROFIBUS, enabling real-time tracking of energy consumption per production cell. This data feeds into energy management dashboards, allowing maintenance engineers to correlate power draw spikes with specific machine cycles and identify opportunities for load shifting or drive parameter optimization.

Power Optimization in Real Production Lines

In automotive body shop lines where SIMATIC S5-135U systems control resistance welding guns and transfer conveyors, the power supply module’s stability directly affects weld cycle repeatability. A welding controller that receives a clean 5V logic supply from the 39PSR4ANDN executes its current ramp profiles accurately, ensuring consistent weld nugget formation without the energy-wasting repeat cycles caused by poor weld quality from an unstable control system.

In food and beverage packaging lines, SIMATIC S5-115U systems managing filling machines and labelers run continuously across three shifts. The 39PSR4ANDN’s ability to maintain regulated output across the full ambient temperature range of the production floor means the PLC does not require warm-up stabilization time at shift start, eliminating the unproductive energy consumption of running the line at reduced speed while the control system stabilizes.

For chemical process plants with SIMATIC S5-155U systems controlling reactor agitators and pump stations, the power supply’s reliability directly impacts mean time between failures (MTBF) of the control system. Each unplanned PSU-related shutdown in a continuous process plant triggers a full batch loss and a restart sequence that consumes significantly more energy than steady-state operation. Replacing a degraded power supply with a tested 39PSR4ANDN unit — verified through our pre-shipment functional test protocol — eliminates this failure mode and restores predictable energy consumption patterns.

Predictive maintenance programs that monitor SIMATIC S5 system health often flag power supply output voltage drift as an early indicator of impending failure. By stocking a replacement 39PSR4ANDN unit, maintenance teams can execute planned replacements during scheduled downtime windows rather than emergency replacements during production hours, avoiding the energy and productivity costs of unplanned stoppages. Our 12-month warranty covers the replacement unit for the full duration of the maintenance planning cycle.

Energy Optimization FAQ

Q1: How does the 39PSR4ANDN contribute to reducing energy consumption in a SIMATIC S5 system?
A stable, regulated power supply eliminates the micro-interruptions and voltage sags that cause the CPU to execute protective routines, restart I/O modules, or trigger drive fault resets. Each of these events consumes additional energy and extends cycle time. The 39PSR4ANDN’s regulated output keeps the system running at its designed operating point, where energy consumption per unit of production output is at its lowest.

Q2: Is the 39PSR4ANDN compatible with all SIMATIC S5 rack configurations?
The 39PSR4ANDN is designed for the SIMATIC S5 power supply slot and is compatible with S5-115U, S5-135U, and S5-155U central racks. It is recommended to verify the rack’s power budget against the total current draw of installed CPU, I/O, and communication modules before installation. Our technical team can assist with compatibility verification prior to order.

Q3: What is the pre-shipment testing process for the 39PSR4ANDN?
Every 39PSR4ANDN unit undergoes functional testing under load conditions before shipment. Output voltage levels, ripple, and regulation performance are verified against Siemens specifications. Units that do not meet specification are not shipped. A test report is available upon request. All units are covered by a 12-month warranty from the date of shipment.

Q4: Can the 39PSR4ANDN be used as a direct drop-in replacement for a failed SIMATIC S5 power supply?
Yes. The 39PSR4ANDN is a direct replacement module for compatible SIMATIC S5 racks. No firmware changes or configuration modifications are required. The replacement procedure involves powering down the rack, swapping the module, and restoring power — the CPU retains its program in battery-backed RAM and resumes normal operation immediately, minimizing downtime and the associated energy cost of a cold restart sequence.

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