ProSoft MVI71-AFC Gas & Liquid Flow Computer | Replacement, Equivalent & Selection Guide
The ProSoft MVI71-AFC is a dedicated Gas and Liquid Flow Computer module designed for the Allen-Bradley PLC-5 platform. It provides AGA-3, AGA-7, and ISO 5167 compliant flow calculations directly within the PLC-5 rack, eliminating the need for a standalone flow computer. Konmask.com supplies genuine and compatible MVI71-AFC units with full traceability for industrial automation projects worldwide.
Technical Specifications
- Part Number: MVI71-AFC
- Manufacturer: ProSoft Technology
- Series: MVI71 (Allen-Bradley PLC-5 Compatible)
- Function: Gas & Liquid Flow Computer (AGA-3, AGA-7, ISO 5167)
- Backplane Interface: Allen-Bradley PLC-5 I/O chassis (1771 bus)
- Communication Ports: 2 × RS-232/422/485 serial ports
- Power Consumption: 800 mA @ 5 VDC (from backplane)
- Weight: 230 g
- Operating Temperature: 0 °C to 60 °C
- Storage Temperature: -40 °C to 85 °C
- Humidity: 5% to 95% non-condensing
- Certifications: CE, UL
- Form Factor: Single-slot 1771 I/O module
Compatible Replacement & Equivalent Models
When the MVI71-AFC is discontinued, obsolete, or unavailable, the following alternatives are commonly evaluated:
- ProSoft MVI56-AFC — Functional equivalent for ControlLogix platform; requires migration of ladder logic and tag mapping
- ProSoft MVI56E-AFC — Enhanced ControlLogix version with Ethernet port; recommended for new designs
- ProSoft MVI71-MNET — Modbus TCP gateway alternative if flow calculations are offloaded to a separate RTU
- Emerson ROC800 — Standalone flow computer; suitable when PLC-5 is also being replaced
- ABB XFC G5 — Standalone gas flow computer; direct replacement when migrating away from PLC-5 rack
- Yokogawa ROTAMASS / ADMAG — Sensor-level alternatives for liquid flow measurement
Note: Cross-platform replacements require engineering review of I/O mapping, communication protocols, and flow calculation standards compliance.
Why Choose the Original MVI71-AFC
- ✅ Drop-in compatibility — fits existing PLC-5 / 1771 chassis without hardware modification
- ✅ Proven AGA & ISO compliance — certified flow algorithms reduce re-validation effort
- ✅ Dual serial ports — simultaneous connection to flow meters and SCADA/DCS
- ✅ Minimal migration cost — preserves existing PLC-5 program investment
- ✅ Long field track record — widely deployed in oil & gas, water treatment, and chemical plants
Typical Applications
- Natural gas custody transfer metering (AGA-3 orifice, AGA-7 turbine)
- Liquid hydrocarbon flow measurement (ISO 5167)
- Water and wastewater flow totalization
- Chemical process flow monitoring and batching
- Pipeline SCADA integration via Modbus RTU / DF1
- Compressor station control and monitoring
System Compatibility
- PLC Platform: Allen-Bradley PLC-5 (all series: PLC-5/10, 5/20, 5/30, 5/40, 5/60, 5/80)
- Chassis: 1771 I/O chassis (4, 8, 12, 16 slot)
- Programming Software: RSLogix 5 (Rockwell Automation)
- Communication Protocols: DF1, Modbus RTU, ASCII
- SCADA Compatibility: Wonderware, iFIX, Ignition, RSView32
- Not compatible with: ControlLogix (use MVI56-AFC), CompactLogix (use MVI46-AFC), SLC 500
Selection Guide
Use this guide to determine whether the MVI71-AFC is the right module for your application:
- Existing PLC-5 system, no migration planned → MVI71-AFC (direct fit)
- Migrating PLC-5 to ControlLogix → MVI56-AFC or MVI56E-AFC
- New greenfield project → MVI56E-AFC (ControlLogix + Ethernet) or standalone flow computer
- Budget-constrained retrofit → Refurbished MVI71-AFC (available at Konmask.com)
- Hazardous area (Zone 1/2) → Consult Konmask engineering team for certified variants
- Multi-run metering station → Multiple MVI71-AFC modules in same chassis (one per run)
Quality Assurance & Sourcing
- 🔍 Authenticity verified — each unit inspected against ProSoft factory markings and firmware version
- 📦 Original packaging — shipped in anti-static ESD packaging with full documentation
- 🏭 Traceable supply chain — sourced from authorized distributors and verified surplus channels
- 🛡️ 90-day warranty — covers manufacturing defects and DOA units
- 🚀 Fast global shipping — DHL / FedEx express available; export documentation provided
How to Order
- Confirm your PLC-5 chassis slot availability and firmware version (RSLogix 5 → Controller Properties)
- Verify flow standard required: AGA-3, AGA-7, or ISO 5167
- Contact Konmask.com with your part number MVI71-AFC and required quantity
- Receive quotation with lead time, shipping options, and export documentation
- Place order via website or email — payment via T/T, PayPal, or trade terms available
📧 Email: [email protected] | 📞 Phone/WhatsApp: +0086 19859288691
Replacement & Compatibility FAQ
Q: Can the MVI71-AFC replace a standalone flow computer like an Emerson ROC?
A: Functionally yes for basic AGA calculations, but the ROC offers more I/O and standalone operation. Evaluate based on your SCADA architecture.
Q: Is the MVI71-AFC still in production?
A: ProSoft Technology has transitioned focus to ControlLogix-based modules. The MVI71-AFC is available as new-surplus and refurbished stock. Contact Konmask.com for current availability.
Q: Can I use two MVI71-AFC modules in the same PLC-5 chassis?
A: Yes. Each module operates independently and can handle a separate meter run. Ensure sufficient backplane power budget (800 mA per module).
Q: What is the difference between MVI71-AFC and MVI71-AFCS?
A: The MVI71-AFCS includes additional steam flow calculation support. If your application involves steam metering, specify the AFCS variant.
Q: Does Konmask.com provide configuration support?
A: Yes. We provide the ProSoft Configuration Builder (PCB) software, sample ladder logic, and basic commissioning guidance with every order.
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Contact: [email protected] | +0086 19859288691
