• Model: MVI56-BAS
• Brand: ProSoft Technology
• Series: MVI56 Communication Modules
• Core Function: BASIC program interface for ControlLogix
• Type: PLC Communication Interface Module
• Key Specs: 24,064 B RAM, three serial ports, single-slot backplane

 

Product Introduction

From a ControlLogix standpoint, the ProSoft MVI56‑BAS is the in‑rack BASIC engine you use when you need to carry an existing 1771‑DB or 1747‑BAS application into a Logix chassis instead of rewriting everything from scratch. It gives you a BASIC runtime, compact flash storage, and serial ports in one ControlLogix slot.

Plants typically choose MVI56‑BAS when they have stable BASIC code doing protocol conversion, string handling, or custom device drivers and want that logic to live beside the ControlLogix CPU. Typical backplane load is about 800 mA at 5.1 V with a 0 to 60 °C operating band, so you must check rack power and cabinet cooling before treating it as “just another” comms card.

 

Key Selling Points & Differentiators

• Lets you reuse legacy BASIC applications for 1771‑DB and 1747‑BAS inside a ControlLogix rack, often with minimal code changes and no external gateway.
• BASIC programs are stored on compact flash, making it straightforward to back up an entire application or clone it to another module for redundancy or lab testing.
• Typical power draw of 800 mA @ 5.1 V is significant for mixed racks; as a rule of thumb, keep at least ~20% margin on your 5 V rail after adding the MVI56‑BAS.
• Compared with writing everything in ladder or structured text, BASIC on this module is still useful for string‑heavy protocols, legacy “foreign device” interfaces, or quick utilities that would be cumbersome in IEC 61131 logic alone.
• Not recommended for new projects where standard protocols (Modbus, EtherNet/IP, IEC, DNP3) already have dedicated modules; in those cases, use the protocol‑specific card and reserve MVI56‑BAS for very specific BASIC reuse or “specials.”
• For stock spares, you can meaningfully reduce risk by insisting on a test report (power‑on, BASIC program load/run, serial I/O exercise, 24+ hour burn‑in) instead of just accepting “good used” on trust.

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