ProSoft MVI56-BAS ControlLogix BASIC Communication Module

Configured for custom programmable ASCII processing and serial communication interface handling in Allen-Bradley ControlLogix backplanes, the ProSoft MVI56-BAS (MVI56-BAS BASIC Communication Module) provides direct physical/electrical execution. The module enables customized BASIC-52 programming algorithms to execute locally within a single ControlLogix chassis slot, processing data directly to and from the controller processor memory via ladder logic data transfer routines across local or remote chassis racks.

Hardware Specifications

Protocol Conversion Latencies and Backplane Bus Synchronization

The ProSoft MVI56-BAS utilizes an onboard microprocessor executing compiled BASIC-52 routines independent of the main ControlLogix CPU cycle. Protocol conversion latencies are minimized by establishing dual-port RAM buffers that interface directly with the ControlLogix backplane driver. Data transfers between the module's 24064-byte RAM allocation and the Programmable Automation Controller (PAC) are controlled via standardized ladder logic block transfers. This decoupled architecture isolates legacy serial devices, custom ASCII barcode scanners, and proprietary serial protocols from degrading backplane bus communication velocity. Onboard surge protection network barriers on the serial interface channels enforce galvanic isolation across connected field instrumentation.

Frequently Asked Questions

Q: Can the MVI56-BAS module be removed or inserted while the ControlLogix chassis is powered?

A: Yes, the module supports Removal and Insertion Under Power (RIUP). However, to prevent data corruption in active registers, control logic communication blocks should be disabled prior to physical extraction.

Q: How is the 24064 bytes RAM program memory protected against power failure?

A: Program code and system parameters stored in module memory rely on the Easy BASIC non-volatile backup architecture, preserving execution scripts across complete power loss cycles without requiring continuous backplane power.

Field Installation Guidelines

1. Power down the ControlLogix rack or verify that local hazardous location conditions permit Removal and Insertion Under Power (RIUP) operation before installation.
2. Align the module circuit board with the top and bottom chassis card guides of the selected slot in the local or remote chassis.
3. Slide the module firmly into the slot until the top and bottom retaining tabs click securely into place on the chassis rail.
4. Connect serial field cabling to the front panel communication interface, maintaining shielded twisted-pair wire routing separated from high-voltage AC motor control lines by at least 300 mm.
5. Terminate all cable shields at a single point grounding bus on the chassis enclosure earth point to prevent ground loops and high-frequency noise interference.