When Modbus Plus Networks Need Floating Point Data
A plant engineer was expanding an older Modbus Plus network. The existing nodes handled integer data fine, but new flow meters and analyzers produced floating point values. Without a dedicated adapter, the network could not carry that data reliably. The Schneider Electric 140X816 solved the problem. This floating point option adapter from the Modicon Momentum range plugs into Modbus Plus bus systems and moves data at 1 Mbps.
What the 140X816 Does
The 140X816 is a floating point option adapter built for Modbus Plus networks. It uses a 9-pin D-sub female connector, so it fits existing cabling without custom rewiring. The adapter supports up to 32 drops and addressing for 1 to 64 nodes. That makes it practical for mid-sized networks that need to add floating point capability without a full system overhaul.
Technical Specifications
| Specification | Value |
|---|---|
| Product Line | Modicon Momentum |
| Description | Floating Point Option Adapter |
| Bus Type | Modbus Plus |
| Communication Rate | 1 Mbps |
| Connector Type | 9-pin D-sub, female |
| Cable Length | 1.8 m (5.91 ft) |
| Transmission Distance | Up to 450 m (1476 ft) |
| Max. Number of Drops | 32 |
| Addressing | 1 to 64 nodes |
| Power Consumption | 2.5 W |
| Mounting Type | Type B |
| Dimensions | 115 mm x 40 mm x 120 mm |
| Weight | 0.2 kg (0.44 lbs) |
Where It Fits in Oil, Gas, and Industrial Automation
The 140X816 suits applications where Modbus Plus networks carry process data. In oil and gas, it can link flow computers and tank gauging systems that output floating point values. In water treatment, it helps integrate analytical instruments into an existing Modbus Plus backbone. The 1 Mbps rate and 450 m transmission distance support plant-wide coverage without extra repeaters in many layouts.
Installation and Setup
Mounting is Type B, and the compact 115 mm x 40 mm x 120 mm housing fits standard enclosures. The 9-pin D-sub female connector accepts the standard Modbus Plus cable. The adapter draws only 2.5 W, so it adds little load to the power budget. Keep cable runs within the 1.8 m adapter cable length and respect the 450 m total transmission distance. For network addressing, plan node IDs between 1 and 64 and stay within the 32-drop limit.
Integration Note
Wiring into a Modbus Plus network may require an external gateway or connection module. Confirm cables and gateways with the supplier before ordering.
Why Buyers Choose the 140X816
The 140X816 keeps legacy Modbus Plus networks productive. It adds floating point capability without replacing the bus architecture. For plants running Modicon Momentum systems, this adapter is a practical, ready-to-ship spare. Oil AutoTech offers fast dispatch, worldwide, and hands-on technical selection help for automation professionals.
Please verify current lifecycle status and availability with Oil AutoTech before ordering. Contact Oil AutoTech today for pricing and availability.
