ProSoft PLX31-MBTCP-MBS – Modbus TCP/IP to Modbus RTU/ASCII Serial Gateway | PLX31 Platform
Engineering Background: Industrial automation networks frequently require seamless bridging between Ethernet-based Modbus TCP/IP supervisory systems and legacy Modbus RTU/ASCII serial field devices. The ProSoft PLX31-MBTCP-MBS was engineered specifically to eliminate this integration barrier — enabling procurement engineers and system integrators to connect modern SCADA/DCS hosts directly to serial PLCs, drives, meters, and sensors without protocol conversion middleware or custom programming.
Product Positioning: The PLX31-MBTCP-MBS is a standalone, DIN-rail-mounted protocol gateway in ProSoft Technology’s PLX31 series. It operates as a Modbus TCP/IP Client/Server on the Ethernet side and a Modbus RTU/ASCII Master/Slave on the serial side — simultaneously — making it the preferred solution for brownfield retrofits, panel upgrades, and multi-vendor automation architectures across process, discrete, and hybrid industries.
Complete Technical Specifications
- Part Number / SKU: PLX31-MBTCP-MBS
- Manufacturer: ProSoft Technology, Inc.
- Product Series: PLX31 Industrial Protocol Gateway
- Protocol – Ethernet Side: Modbus TCP/IP (Client & Server, simultaneous)
- Protocol – Serial Side: Modbus RTU / Modbus ASCII (Master & Slave, simultaneous)
- Ethernet Port: 1 × RJ45, 10/100 Mbps, Auto-MDI/MDIX
- Serial Port: 1 × RS-232 / RS-485 / RS-422 (software-selectable)
- Serial Baud Rate: 300 – 115,200 bps
- Max Modbus TCP Connections: Up to 10 simultaneous client connections
- Max Modbus Register Mapping: 5,000 registers (configurable)
- Power Supply: 10–30 VDC (24 VDC nominal)
- Power Consumption: ≤ 3 W typical
- Operating Temperature: -40°C to +70°C (-40°F to +158°F)
- Storage Temperature: -40°C to +85°C
- Relative Humidity: 5–95% non-condensing
- Mounting: DIN-rail (35 mm EN 50022)
- Enclosure Rating: IP20
- Dimensions (W × H × D): 35 mm × 99 mm × 114 mm
- Weight: 230 g
- Certifications: CE, UL, cUL, RoHS
- Configuration Interface: Web browser (no proprietary software required)
- Firmware Update: Via Ethernet (web interface)
- LED Indicators: Power, Ethernet Link/Activity, Serial TX/RX, Module Status
Proven Application Environments
- Oil & Gas: Connecting Modbus TCP SCADA hosts to RTU/PLC serial field instruments at wellheads and compressor stations
- Water & Wastewater: Bridging Ethernet-based HMI/SCADA to serial flow meters, level sensors, and pump controllers
- Power Generation & Distribution: Integrating legacy serial energy meters and protection relays into modern Ethernet-based energy management systems
- Building Automation: Linking BMS Modbus TCP controllers to serial HVAC drives, chillers, and lighting controllers
- Discrete Manufacturing: Enabling Modbus TCP PLCs to communicate with serial servo drives, VFDs, and barcode readers on production lines
- Panel Retrofits & Brownfield Upgrades: Preserving existing serial wiring investment while migrating supervisory layer to Ethernet
Engineering Advantages
- Bidirectional Simultaneous Operation: Acts as both Client and Server on TCP side, and both Master and Slave on serial side — no mode switching required
- Browser-Based Configuration: Zero proprietary software dependency; configure via any standard web browser over Ethernet
- Wide Temperature Range: -40°C to +70°C rated for harsh industrial environments without additional enclosure cooling
- Compact DIN-Rail Form Factor: 35 mm wide — minimal panel space consumption in high-density control cabinets
- Flexible Serial Interface: RS-232/RS-485/RS-422 software-selectable on a single port — one SKU covers multiple wiring topologies
- Robust Register Mapping: Up to 5,000 configurable Modbus registers with flexible address mapping between TCP and serial domains
- Proven PLX31 Platform Reliability: Field-proven across thousands of installations globally in critical infrastructure
System Architecture & Signal Flow
The PLX31-MBTCP-MBS operates as a transparent protocol bridge. On the Ethernet side, it accepts Modbus TCP/IP read/write requests from up to 10 simultaneous client connections (SCADA, HMI, DCS, or PLC). These requests are translated in real-time and forwarded to the serial port as Modbus RTU or ASCII commands to downstream field devices. Responses are returned upstream with sub-millisecond protocol conversion latency. The internal register database (up to 5,000 registers) acts as a shared data buffer, enabling asynchronous polling on both sides without data collision. Configuration is performed entirely via the built-in web server — no PC-resident software, no license keys.
Sourcing & Quality Verification
- All units sourced through authorized ProSoft Technology distribution channels or verified secondary market with full traceability
- Each unit inspected for physical integrity, label authenticity, and firmware version prior to shipment
- Original ProSoft packaging and documentation preserved where available
- Certificates of conformity and test records available upon request for critical infrastructure procurement
- Konmask.com specializes in industrial automation components — PLX31-MBTCP-MBS is a core catalog SKU with consistent stock availability
Procurement Process
- Step 1: Confirm quantity and delivery timeline requirements with our technical team
- Step 2: Request formal quotation via email: support@konmask.com or WhatsApp: +0086 19859288691
- Step 3: Review and approve proforma invoice; select preferred payment method (T/T, PayPal, credit card)
- Step 4: Units shipped via DHL / FedEx / UPS with full tracking; export documentation provided for international orders
- Step 5: Post-delivery technical support available for configuration and commissioning assistance
Technical FAQ
Q: Can the PLX31-MBTCP-MBS act as both a Modbus TCP Server and Client simultaneously?
A: Yes. The module supports simultaneous Client and Server operation on the Ethernet side, allowing it to both respond to incoming requests and initiate polling to other TCP devices.
Q: What serial standards are supported?
A: RS-232, RS-485 (2-wire and 4-wire), and RS-422 are all supported on the single serial port, selectable via the web configuration interface.
Q: Is proprietary software required for configuration?
A: No. Configuration is performed entirely through a standard web browser. No ProSoft software installation is required.
Q: What is the maximum number of Modbus TCP client connections?
A: Up to 10 simultaneous Modbus TCP client connections are supported.
Q: Is the unit suitable for outdoor or harsh environment installation?
A: The PLX31-MBTCP-MBS is rated IP20 and designed for panel/cabinet installation. For outdoor or wash-down environments, an appropriate IP-rated enclosure is required. The operating temperature range of -40°C to +70°C covers most industrial indoor and sheltered outdoor applications.
Q: Can Konmask provide configuration support after delivery?
A: Yes. Our technical team provides post-sale configuration guidance. Contact support@konmask.com for commissioning assistance.
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Contact: support@konmask.com | +0086 19859288691
