IP3112-B318-0000 Beckhoff
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The Beckhoff IP3112-B318-0000 is part of the IP Compact Box Units series and features 4 differential current input channels with 15-bit plus sign resolution. It offers channel isolation of 500 V, a common mode voltage of 35 V max, and supports connection with M12 screw-in connectors on a PROFIBUS Tee fieldbus system.
Internal Product Review
The IP3112-B318-0000 is a Beckhoff compact box current input module with 4 channels. The 15 bits + sign resolution and <±0.3% FS relative error support accurate, dependable analog signal acquisition. M12 screw-in connectivity makes the unit especially appealing for stable field installation.
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Product Description:
The IP3112-B318-0000 is an analog input block from Beckhoff that belongs to the IP Compact Box Units series. It functions as a decentralized current-measurement interface for automation cells connected over PROFIBUS. Housed in a fully potted enclosure, the device collects industrial 0–20 mA or 4–20 mA loop signals and forwards digitized data to controllers without requiring a cabinet. By combining signal conversion, galvanic isolation, and bus coupling in one field-mountable package, the unit streamlines installation on conveyors, filling skids, and other distributed equipment.
The module provides 4 differential channels, so four separate process sensors can be monitored simultaneously. Each channel has 500 V of isolation from the internal logic domain, reducing the risk of ground loops when transducers operate at different potentials. A conversion cycle of 140 ms updates the entire channel group and determines how quickly the PLC can obtain fresh values. With a native resolution of 15 bits plus sign, the analog-to-digital stage divides the 20 mA span into 32,768 steps, supporting fine set-point regulation. The input circuitry has an impedance of 80 Ω, ensuring that the loop burden remains low and transmitter supply compliance is not exceeded.
Signal accuracy stays within a relative error band of ±0.3% of full scale, while factory-implemented digital filters provide 10 smoothing profiles for suppressing noise. The common-mode window reaches a 35 V maximum, allowing proper operation even when sensor grounds float above the internal reference, which is connected to a common internal ground. Sensors can be powered locally because up to 30 VDC is available through the auxiliary terminals. Field wiring uses threaded M12 screw-in connectors, providing quick, sealed connections for the I/O and PROFIBUS lines. Once connected through the PROFIBUS tee connector, the unit delivers a process image of 4 × 16-bit inputs directly to the master controller.
