Modbus RTU/ASCII Communication Solution — ProSoft MVI94-MCM | ControlLogix Series
Where This Product Is Used
The ProSoft MVI94-MCM is deployed wherever a Rockwell Automation ControlLogix backplane must exchange data with legacy Modbus RTU or ASCII field devices. Typical deployment environments include:
- Oil & Gas Wellhead & Pipeline SCADA — integrating flow computers, RTUs, and pressure transmitters that speak Modbus RTU into a ControlLogix-based DCS backbone.
- Water & Wastewater Treatment Plants — bridging Modbus-enabled pumps, VFDs, and analyzers to a central ControlLogix PLC for SCADA visibility.
- Power Generation & Substation Automation — connecting protective relays, energy meters, and UPS systems via Modbus ASCII/RTU to the plant control network.
- Pharmaceutical & Food Manufacturing — linking legacy batch reactors, temperature controllers, and weighing systems to a modern ControlLogix architecture without replacing field instruments.
- Building Automation & HVAC — aggregating Modbus RTU data from chillers, AHUs, and BMS controllers into a unified ControlLogix supervisory layer.
- Mining & Metals Processing — interfacing conveyor drives, crusher controls, and motor protection relays that use Modbus into a ControlLogix-based safety and control system.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | MVI94-MCM |
| Platform | Rockwell Automation ControlLogix (1756 backplane) |
| Protocol | Modbus RTU & ASCII (Master and Slave) |
| Serial Ports | 2 × RS-232/RS-422/RS-485 (software selectable) |
| Message Throughput | Up to 250 messages/second |
| Data Table Size | Up to 5,000 registers (input + output) |
| Baud Rate | 110 – 115,200 bps |
| Power Consumption | 800 mA @ 5 VDC (from backplane) |
| Operating Temperature | 0°C to +60°C |
| Storage Temperature | -40°C to +85°C |
| Humidity | 5% to 95% non-condensing |
| Mounting | ControlLogix 1756 chassis slot (any slot) |
| Dimensions | Standard 1756 single-slot module |
| Weight | ~400 g |
| Certifications | UL, CE, cUL |
Why Engineers Specify This Model
- Dual-port flexibility — two independently configurable serial ports allow simultaneous Master on Port 1 and Slave on Port 2, eliminating the need for a second module in mixed-topology networks.
- High message density — 250 msg/sec throughput handles large polling lists without introducing scan-cycle latency into the ControlLogix controller.
- Zero-impact backplane integration — the module maps Modbus registers directly into the ControlLogix tag database via produced/consumed tags; no custom ladder logic required for data movement.
- Configurable via ProSoft Configuration Builder (PCB) — free Windows utility with import/export of .mvi94 config files, reducing commissioning time on multi-site rollouts.
- Robust error diagnostics — per-command error counters and event log accessible via RSLogix 5000 / Studio 5000 message instructions for rapid fault isolation.
- Long field-proven track record — the MVI94 platform has been in production since the early ControlLogix era; spare-parts availability and firmware support are well-established.
Complete System Bill of Materials
A typical MVI94-MCM deployment requires the following components:
- ProSoft MVI94-MCM module (this item)
- Rockwell Automation 1756 chassis (4-, 7-, 10-, 13-, or 17-slot)
- Rockwell Automation 1756-PA72 or 1756-PB72 power supply
- Rockwell Automation 1756-L6x / L7x / L8x ControlLogix controller
- ProSoft RJ45-to-DB9 serial cable (MVI94-MCM ships with one cable per port)
- RS-485 termination resistors (120 Ω) for multi-drop bus topologies
- ProSoft Configuration Builder (PCB) software — free download from ProSoft website
- Rockwell Automation Studio 5000 Logix Designer (licensed separately)
Compliance & Industry Standards
- UL 508 — Industrial Control Equipment
- CE Marking — EMC Directive 2014/30/EU & Low Voltage Directive 2014/35/EU
- cUL — Canadian safety certification
- Modbus.org — compliant with the official Modbus Application Protocol Specification V1.1b3
- RoHS — compliant with EU Directive 2011/65/EU (restriction of hazardous substances)
Quality Assurance & Sourcing
Konmask.com sources ProSoft modules through verified industrial distribution channels. Every MVI94-MCM unit offered on this listing:
- Is inspected for physical integrity and label authenticity prior to dispatch.
- Ships with original ProSoft firmware version intact — no field re-flashing required.
- Is traceable to batch/lot documentation available upon request for regulated industries.
- Carries a 90-day Konmask warranty covering DOA and latent manufacturing defects.
- Can be accompanied by a Certificate of Conformance (CoC) — request at checkout or via support@konmask.com.
How to Source This Part
- Add to cart and complete checkout — in-stock units ship within 1–3 business days from our warehouse.
- Request a quote for volume orders (5+ units) or project-based procurement — email support@konmask.com with your project BOM.
- Expedited sourcing — if the item shows as out of stock, contact us directly; we maintain relationships with multiple ProSoft-authorized distributors and can typically locate stock within 48 hours.
- International shipping — we ship worldwide via DHL Express, FedEx International Priority, and UPS Worldwide. HS Code: 8537.10 (programmable controllers). Import duties are the buyer’s responsibility.
Application-Specific FAQ
Q: Can the MVI94-MCM act as both Modbus Master and Slave simultaneously?
A: Yes. Port 1 can be configured as Master (polling field devices) while Port 2 operates as Slave (responding to a SCADA host), all within the same module.
Q: Is the MVI94-MCM compatible with Studio 5000 Logix Designer v32 and later?
A: Yes. The module uses standard MSG instructions and Add-On Instructions (AOIs) that are compatible with all current Studio 5000 versions. ProSoft provides updated AOI files on their support portal.
Q: What is the maximum number of Modbus slave devices I can poll?
A: The module supports up to 100 command entries per port, each addressable to a unique slave ID (1–247). With optimized polling intervals, networks of 30–50 devices per port are common in production.
Q: Can I use RS-485 multi-drop wiring with this module?
A: Yes. Each port supports RS-485 (2-wire or 4-wire) with software-selectable termination. Ensure 120 Ω termination resistors are installed at both ends of the bus.
Q: Does Konmask provide configuration support?
A: Yes. Our technical team can assist with ProSoft Configuration Builder setup, command list structuring, and ControlLogix tag mapping. Contact support@konmask.com with your application details.
Q: What is the lead time if the item is out of stock?
A: Typically 3–10 business days depending on regional distributor stock. Contact us for a firm commitment date before placing your order.
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