ProSoft MVI56-AFC ControlLogix Flow Computer Module

The ProSoft MVI56-AFC, also cataloged as the MVI56-AFC In-Chassis Flow Computer Module, operates as a dedicated hardware component for AGA and API compliant hydrocarbon flow calculations within Allen-Bradley ControlLogix backplane platforms.

Hardware Specifications

Industrial Network Protocol Conversion Latencies

The MVI56-AFC offloads real-time AGA 3, AGA 7, AGA 8, API 11.1, and API 21.1/21.2 dynamic calculations entirely from the primary ControlLogix CPU to eliminate cyclic scan time penalties. Integrated serial application interfaces support concurrent polling of multi-variable transmitters, ultrasonic flow meters, and gas chromatographs. Protocol conversion latencies between field serial streams and the ControlLogix backplane bus stay within deterministic processing windows through dual-port RAM buffers, maintaining audit trail archiving integrity for hourly, daily, and monthly custody transfer registers.

Frequently Asked Questions

Q: Can the MVI56-AFC be inserted into or removed from the ControlLogix chassis while backplane power is applied?

A: Yes. The module supports Removal and Insertion Under Power (RIUP) within ControlLogix backplanes, though serial cable connections must be secured prior to seating to avoid transient communication faults.

Q: What are the backplane power supply constraints when adding this card to a ControlLogix rack?

A: The module draws 800 mA at 5.1 VDC and 3 mA at 24 VDC directly from the local backplane power supply. Total power consumption calculations for the local rack must account for this draw alongside the controller and other I/O cards.

Q: How are serial application ports isolated from system ground?

A: The two configurable serial communication ports feature optical galvanic isolation to prevent ground loops and protect module logic from field-induced electrical surges.

Field Installation Guidelines

• Chassis Seating: Align the circuit card with the top and bottom chassis guides of the selected ControlLogix slot. Slide the module firm into the backplane until the top and bottom retaining tabs click securely into position.
• Cable Shielding: Connect RS-232, RS-422, or RS-485 serial field cables using shielded twisted-pair wire. Ground the cable shield at a single end (typically at the field terminal enclosure) to eliminate circulating ground currents.
• Wiring Separation: Route serial communication and power supply cables in separate conduits away from high-voltage AC lines, variable frequency drives, and heavy inductive switching loads.
• Environmental Clearance: Ensure adequate airflow around the ControlLogix rack slot to maintain operational ambient conditions within 0 deg C to 60 deg C.