IP3112-B318 Beckhoff
Wake Industrial LLC is not an authorized distributor of this product.
The Beckhoff IP3112-B318 is part of the IP Compact Box Units series and operates on the PROFIBUS bus system. This unit features 4 analog inputs with a channel isolation of 500 V and a measurement error of ±0.3 percent full scale. It provides a resolution of 15 bits plus sign and has a conversion time of 140 milliseconds.
Internal Product Review
The Beckhoff IP3112-B318 is a PROFIBUS analog input box unit with 4 analog inputs for distributed machine I/O. The 15-bit-plus-sign resolution and ±0.3% full-scale maximum measurement error support accurate signal acquisition and consistent control performance. An integrated tee-connector streamlines bus installation, while 500 V channel isolation is a strong advantage in demanding industrial environments.
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Product Description:
The IP3112-B318 analog input box is produced by Beckhoff and belongs to the IP Compact Box Units series. Mounted close to the machine, it acquires differential current or voltage signals from field sensors and forwards the converted values to the higher-level controller through its built-in PROFIBUS interface. By combining data acquisition, sensor supply, and a tee-style bus connection in a sealed enclosure, the module supports distributed I/O layouts used in material handling, packaging, and assembly lines. Its placement near the signal source can also help keep field wiring short and organized.
The module provides 4 analog inputs, allowing four process variables to be measured at the same time. Communication takes place over PROFIBUS, so the unit can be inserted directly into an existing fieldbus segment. The inputs are galvanically isolated with 500 V of channel isolation, which helps protect upstream electronics from transient voltages and reduces ground-loop effects. A full scan of all channels is completed within 140 ms, which sets the update pace seen by the PLC process image. Measurement accuracy is rated at ±0.3% full scale, and ten selectable filter modes help smooth unstable signals before conversion. The integrated tee-connector also supports straightforward daisy-chain wiring between adjacent IP units.
Input tolerance extends to 35 V of common-mode potential, so connected sensors can float relative to ground without upsetting signal acquisition. The input stage has an 80 Ω resistance, which is the electrical load presented to the circuit. Data are coded with 15-bit + sign resolution, giving fine numerical steps for both positive and negative values. For transducers that need excitation, the module can pass through a sensor supply of up to 30 VDC from the field side. A downstream M8 connector relays bus and power to additional IP units, while the feed connector accepts incoming lines. Sealed M12 screw-in signal connectors and 4 × 16-bit process-image mapping support stable signal handling in compact distributed installations.
