Schneider Electric 140X816 Modbus Plus Floating Point Adapter

Schneider Electric 140X816 Modbus Plus Floating Point Adapter

Key technical specifications

• Manufacturer: Schneider Electric, part of the renowned Modicon Momentum series.
• Model number: 140X816 – a dedicated floating point option adapter.
• Bus protocol: native Modbus Plus with a fixed data rate of 1 Mbps.
• Connector type: one 9‑pin D‑sub female port, ready for immediate field use.
• Included cable: factory‑attached 1.8 m (5.91 ft) cable simplifies installation.
• Maximum transmission distance: up to 450 m (1476 ft) between nodes.
• Network capacity: supports 1 to 64 node addresses, with a maximum of 32 physical drops.
• Power consumption: only 2.5 W, ensuring energy‑efficient operation.
• Dimensions: 115 mm length, 40 mm height, 120 mm depth – compact footprint.
• Weight: just 0.2 kg (0.44 lbs), easy to handle during mounting.
• Mounting type: Type B, compatible with standard DIN rails or panel mounting.

Environmental resistance and reliability

• Operating temperature range: 0 °C to 60 °C, suitable for industrial control cabinets.
• Storage temperature: -40 °C to 85 °C, withstanding harsh logistics conditions.
• Humidity tolerance: 5 % to 95 % non‑condensing, per IEC 60068‑2‑30.
• Immunity to electromagnetic interference complies with Modbus Plus physical layer specs.
• High noise immunity ensures error‑free floating point data transfer.

Frequently asked questions

• Is the 140X816 compatible with older Modicon 984 controllers?
  Yes, the 140X816 works with any Modicon Momentum or 984 system that supports Modbus Plus at 1 Mbps.
• Does the adapter require an external power supply?
  No, it draws the 2.5 W directly from the Momentum bus through the backplane connector.
• Can I extend the cable length beyond 1.8 meters?
  The integrated cable is fixed, but you can use a standard Modbus Plus extension cable with a 9‑pin D‑sub coupler.
• What is the maximum number of 140X816 units on one Modbus Plus line?
  You can install up to 32 physical adapters (drops) on a single segment, addressing up to 64 logical nodes.
• Does the adapter support floating point data types natively?
  Yes, the 140X816 handles IEEE 754 floating point format without extra programming.
• Are there any special mounting requirements for vibration-prone areas?
  The Type B mounting clip secures firmly on a DIN rail; for high vibration, we recommend an additional end bracket.

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