Bosch Rexroth VM310 0608750109-102 PLC Power Supply Module – VM310 Series

VM310 0608750109-102 — Backplane-Integrated DC Power Distribution Module for Bosch Rexroth VM310 Modular Control Architecture

The Bosch Rexroth VM310 0608750109-102 is a slot-mounted, backplane-native DC power supply module designed exclusively for the VM310 modular programmable controller rack. Its function is not limited to voltage conversion: the module participates actively in the VM310 rack’s inter-module diagnostic protocol, contributes to scan-cycle determinism through regulated rail stability, and provides galvanic isolation between the AC mains input and all downstream logic and field power circuits. In high-availability process control environments — continuous chemical dosing systems, automotive body-in-white welding lines, pharmaceutical batch reactors — the electrical behavior of the power supply module is a direct determinant of controller uptime and fault response fidelity.

The 0608750109-102 variant occupies a dedicated PSU slot in the VM310 backplane and distributes two regulated DC rails across the rack’s internal bus: a +5 V logic rail serving the CPU module, inter-module communication bus, and all installed I/O modules, and a +24 V field power rail supplying sensor and actuator circuits through the I/O module terminal interfaces. Both rails are derived from isolated secondary windings on the main power transformer, ensuring that load transients on the 24 V field side — generated by inductive actuator switching, solenoid valve energization, or proximity sensor inrush — cannot propagate into the 5 V logic domain and disturb CPU instruction execution or backplane data frame integrity.

This module is not field-configurable and is not interchangeable with other VM310 PSU variants without a full rack current budget audit. The fixed output specification is an intentional design constraint that eliminates the configuration variability that would otherwise introduce uncertainty into the rack’s total power envelope across its service life. For procurement engineers specifying spare parts for long-term plant maintenance contracts, the 0608750109-102 OEM part number provides an unambiguous reference that maps to a single, fully characterized electrical specification.

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Technical Parameters

Hardware Logical Analysis

The 0608750109-102 is built on a half-bridge forward switching topology preceded by an active power factor correction stage. The PFC pre-stage operates as a boost converter, shaping the AC input current waveform to track the supply voltage sinusoid and maintaining a displacement power factor above 0.95 across the full load range. In facilities where multiple VM310 racks share a common feeder circuit or a shared transformer secondary, this characteristic reduces RMS current demand on the distribution panel and suppresses low-order harmonic injection — a relevant consideration in plants where variable-frequency drives and thyristor-controlled rectifiers already contribute harmonic loading to the 400 V bus.

The main isolation transformer operates in the 100–200 kHz switching frequency band. At these frequencies, the transformer core cross-section required for a given power throughput is substantially smaller than an equivalent 50 Hz design, which is the primary reason the module achieves its single-slot form factor without sacrificing output current capacity. The secondary side employs synchronous rectification using low-Rds(on) MOSFETs in place of conventional Schottky diodes. Synchronous rectification reduces secondary-side conduction losses by approximately 60–70 % at equivalent current levels. In a VM310 rack where the PSU slot is flanked by a CPU module and a high-density digital I/O module, this reduction in internal dissipation prevents the power supply from becoming the dominant thermal source in the enclosure and allows the rack to operate at the upper boundary of its ambient temperature specification without module derating.

The backplane interface carries three distinct signal categories beyond the DC power rails: a serial diagnostic bus operating on the VM310 inter-module proprietary protocol, a power-good assertion line, and a remote inhibit line. The diagnostic bus allows the CPU module to poll the PSU for output voltage deviation (reported at ±1 % resolution), output current loading (±2 % resolution), and internal heatsink temperature. These values are written into the VM310 system diagnostic buffer at each scan cycle. A sustained upward trend in output current at constant load — indicating increasing impedance in downstream wiring or connector contact resistance — can be detected and alarmed at the PLC program level before the voltage drop reaches the threshold that triggers a module fault and forces an unplanned shutdown.

The AC input filter network uses a three-stage architecture: a common-mode choke wound on a high-permeability ferrite toroid, X-capacitors bridging line-to-line, and Y-capacitors from each line conductor to the protective earth rail. This configuration attenuates both differential-mode and common-mode conducted interference. In industrial environments where large contactors, soft starters, or DC drives share the same AC distribution bus, this filter prevents switching transients from propagating into the VM310 logic supply rails and causing spurious CPU resets or memory parity faults. The +5 V crowbar overvoltage circuit fires within 10 µs if the logic rail exceeds 5.75 V, clamping the rail before sustained overvoltage can trigger latch-up in the CMOS logic devices on the CPU and I/O modules.

System Integration Benefits

• Scan cycle timing stability: Output voltage held within ±1 % under static and dynamic load conditions keeps the VM310 CPU’s internal oscillator, SRAM refresh timing, and I/O bus arbitration circuits within their specified supply tolerance bands, eliminating supply-induced variation in scan cycle execution time across production shifts.
• Galvanically isolated dual-rail architecture: The logic bus supply is derived from a dedicated secondary winding, fully isolated from the 24 V field power rail. Load transients generated by field-side actuators and sensors cannot couple into the inter-module data bus, preventing CRC errors in CPU-to-I/O module communication frames during high-frequency output switching events.
• Per-scan-cycle diagnostic telemetry: Voltage, current, and temperature data reported to the CPU diagnostic buffer at every scan cycle enables PLC-program-level threshold alarming without external monitoring hardware. Engineers can configure HMI warnings for supply degradation trends and log timestamped events for maintenance records and predictive maintenance programs.
• Controlled inrush for multi-rack panels: The soft-start circuit limits peak inrush current to below 20 A during power-on. In control panels with multiple VM310 racks energized simultaneously from a shared MCB, this prevents nuisance tripping caused by simultaneous capacitor charging inrush from multiple power supply modules on the same breaker.
• Reduced enclosure thermal load: Synchronous rectification and high-frequency conversion topology minimize internal power dissipation. The lower thermal output of the PSU reduces the cabinet cooling requirement, allowing the VM310 rack to operate at its rated ambient temperature ceiling without forced derating of adjacent CPU or I/O modules.
• Field fault containment without CPU reset: Galvanic isolation between the 24 V field power output and the 5 V logic rail means a field-side short circuit collapses only the field power rail. The CPU logic supply remains stable, allowing the CPU to log the fault event with timestamp and I/O channel address, and execute a programmed safe-state sequence rather than experiencing an uncontrolled hard reset.
• Zero-configuration hot-swap replacement: The 0608750109-102 conforms fully to the VM310 mechanical slot standard and backplane electrical interface specification. Module replacement requires no firmware update or parameter reconfiguration. The CPU detects the replacement module via the diagnostic bus handshake within one scan cycle and resumes normal operation automatically.
• Harmonic load reduction on plant distribution: Active PFC suppresses third and fifth harmonic current injection from the power supply’s rectifier stage. In facilities with multiple automation racks on a shared transformer secondary, this reduces neutral conductor loading and lowers the risk of transformer derating due to harmonic heating effects.
• Documented OEM lifecycle traceability: As a catalogued Bosch Rexroth spare part with a published OEM part number, the 0608750109-102 is supported under Rexroth’s industrial lifecycle program. Cross-reference documentation to successor part numbers is maintained for long-term upgrade planning without forced platform migration or re-engineering of the control cabinet.

Quality Assurance & Global Logistics

All VM310 0608750109-102 units supplied through siemensplc.com are genuine Bosch Rexroth OEM components sourced through verified distribution channels. No remanufactured, reconditioned, or third-party compatible substitutes are held in stock or dispatched. Authenticity verification on receipt includes cross-checking the Rexroth holographic security label, OEM serial number format against Rexroth’s documented serial structure, and housing mold markings against reference units held in our inspection inventory.

Each unit undergoes a bench-level power-on acceptance test before dispatch: AC input is applied within the rated voltage range, both DC output rails are measured under calibrated resistive loads at 50 % and 100 % of rated current, and the diagnostic bus handshake response is confirmed against expected protocol timing. Units that fail any measured parameter are quarantined and removed from saleable stock. A test record is available on request for quality-critical procurement processes requiring incoming inspection documentation.

Logistics operations are based in Xiamen, China — a primary export hub with direct carrier access to DHL Express, FedEx International Priority, UPS Worldwide Expedited, and consolidated LCL sea freight services. In-stock orders are dispatched within 1–3 business days of payment confirmation. Full export documentation is prepared as standard: commercial invoice, packing list, certificate of origin, and HS code declaration. For plant shutdown scenarios requiring same-day dispatch, orders confirmed before 14:00 CST can be processed for same-day carrier collection, subject to stock confirmation at time of order. The 12-month warranty covers defects in materials and workmanship from the invoice date, with a target replacement dispatch of 5 business days from confirmed fault diagnosis.

Contact Information

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Location: Xiamen, China
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