SIEMENS 6AG1931-2FC21-7AA0 SIPLUS PS DC UPS Module | Replacement, Equivalent & Selection Guide
The SIEMENS 6AG1931-2FC21-7AA0 is a SIPLUS-series DC UPS (Uninterruptible Power Supply) module engineered for extended-range and harsh-environment industrial applications. Designed as a ruggedized variant of the SITOP UPS family, it provides reliable buffered DC power to critical automation systems even under extreme temperature, vibration, and condensation conditions. This page serves as a comprehensive selection, replacement, and compatibility reference for procurement engineers and system integrators.
Technical Specifications
- Part Number: 6AG1931-2FC21-7AA0
- Product Family: SIPLUS PS / SITOP UPS
- Function: DC UPS Buffer Module
- Input Voltage: 24 V DC
- Output Voltage: 24 V DC (buffered)
- Battery Type: Maintenance-free lead-acid / compatible capacitor module
- Ambient Temperature (Operation): -25 °C to +60 °C (SIPLUS extended range)
- Degree of Protection: IP20
- Mounting: DIN rail (35 mm)
- Communication Interface: USB / IO-Link (depending on firmware revision)
- Approvals: CE, UL, cULus
- Weight: approx. 1,100 g
- SIPLUS Conformal Coating: Yes – suitable for condensation, corrosive atmospheres
Compatible Replacement & Equivalent Models
The following models are functionally equivalent or drop-in replacements for the 6AG1931-2FC21-7AA0. Always verify electrical ratings and firmware compatibility before substitution.
- 6EP1931-2FC21 – SITOP UPS1600 standard version (non-SIPLUS); identical electrical specs, standard temperature range
- 6AG1931-2FC11-7AA0 – Earlier SIPLUS UPS variant; verify buffer capacity and communication interface
- 6EP1931-2EC41 – SITOP UPS500S; compact alternative for lower buffer requirements
- 6EP1931-2DC21 – SITOP UPS1100; suitable for systems requiring USB-only communication
- Phoenix Contact QUINT-UPS/24DC/24DC/10 – Third-party equivalent; 24 V DC, 10 A, DIN rail, comparable buffering logic
- Puls ML100.100 – Alternative DC UPS for 24 V systems; confirm buffer time and load profile
Note: SIPLUS variants (6AG1xxx) include conformal coating and extended temperature ratings not present in standard SITOP (6EP1xxx) equivalents. Confirm environmental requirements before substitution.
Why Choose the Original Model
- Harsh-Environment Rated: SIPLUS conformal coating protects against condensation, dust, and corrosive gases — critical for outdoor cabinets, marine, and chemical plant environments.
- Extended Temperature Range: Operates reliably from -25 °C to +60 °C, far exceeding standard SITOP modules.
- Seamless SIMATIC Integration: Native compatibility with SIMATIC S7-300/400/1200/1500 and TIA Portal diagnostics.
- Proven Reliability: Maintenance-free battery management with automatic charge monitoring and early-warning signaling.
- Regulatory Compliance: CE, UL, and cULus certified for global deployment.
Typical Applications
- Buffered power supply for SIMATIC PLCs and distributed I/O in harsh environments
- Controlled shutdown of HMI panels and industrial PCs during power failure
- Data retention for PROFINET/PROFIBUS network components
- Outdoor control cabinets subject to condensation and wide temperature swings
- Chemical, oil & gas, water treatment, and marine automation systems
- Railway and transportation infrastructure control panels
System Compatibility
- PLC Platforms: SIMATIC S7-300, S7-400, S7-1200, S7-1500, ET 200SP/MP
- Power Supply Pairing: SITOP PSU8200, PSU6200, modular SITOP series (24 V DC output)
- Communication: USB interface for SITOP UPS Manager software; IO-Link for TIA Portal integration
- Battery Modules: Compatible with SITOP BAT1600 and equivalent lead-acid buffer modules
- Software: SITOP UPS Manager, TIA Portal V14+, STEP 7 V5.5+
Selection Guide
Use the criteria below to confirm the 6AG1931-2FC21-7AA0 is the right choice — or to identify the best alternative:
- Environment: If ambient temperature exceeds +40 °C or condensation is present → select SIPLUS (6AG1xxx) variant ✓
- Buffer Time: Calculate required buffer time (load current × buffer capacity). UPS1600 series supports up to 40 Ah with external battery modules.
- Communication Requirement: USB only → 6EP1931-2DC21; IO-Link/TIA Portal → 6AG1931-2FC21-7AA0 ✓
- Budget Constraint: Standard environment + lower budget → consider 6EP1931-2FC21 (non-SIPLUS)
- Third-Party Option: Phoenix Contact QUINT-UPS or Puls ML100 for non-Siemens ecosystems
- Refurbished vs. New: Refurbished units from certified sources (e.g., Konmask.com) offer 40–60% cost savings with full functional testing.
Quality Assurance & Sourcing
All units supplied by Konmask.com undergo a rigorous multi-stage inspection process:
- Visual inspection: housing integrity, connector condition, label verification
- Electrical test: input/output voltage, buffer switching, charge circuit validation
- Communication test: USB enumeration and SITOP UPS Manager connectivity
- Burn-in test: 24-hour load cycle under rated conditions
- Packaging: anti-static bag, foam-lined box, humidity indicator card
We source directly from decommissioned industrial projects, authorized distributors, and certified refurbishers. Each unit ships with a 90-day functional warranty.
How to Order
- Part Number: 6AG1931-2FC21-7AA0
- Condition: Refurbished / Used – Tested
- Lead Time: Typically 1–3 business days (subject to stock)
- Shipping: DHL Express / FedEx International Priority worldwide
- Payment: T/T, PayPal, credit card via Shopify Payments
- Bulk Inquiry: Contact support@konmask.com for volume pricing and project quotations
Add to cart directly, or contact us for a formal quotation with datasheet and test report.
Replacement & Compatibility FAQ
- Q: Can I replace 6AG1931-2FC21-7AA0 with 6EP1931-2FC21?
- A: Electrically yes — both are 24 V DC UPS1600-class modules. However, the 6EP1931-2FC21 lacks SIPLUS conformal coating and is rated only to +40 °C. Only substitute if your environment is controlled and within standard temperature limits.
- Q: Is the battery module included?
- A: The 6AG1931-2FC21-7AA0 is the UPS electronics module. Battery buffer modules (e.g., BAT1600) are sold separately. Please confirm your existing battery module compatibility before ordering.
- Q: Does this unit work with TIA Portal?
- A: Yes. The -7AA0 variant supports IO-Link communication, enabling full integration with TIA Portal V14 and above for diagnostics and parameterization.
- Q: What is the difference between 6AG1931-2FC21-7AA0 and 6AG1931-2FC11-7AA0?
- A: The -2FC21 revision includes updated firmware, improved IO-Link support, and enhanced buffer management compared to the earlier -2FC11. Verify your system’s firmware compatibility if substituting.
- Q: Do you provide a test report?
- A: Yes. A functional test report is available upon request for all refurbished units. Contact support@konmask.com.
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