KL3228 Beckhoff
Wake Industrial LLC is not an authorized distributor of this product.
MPN: KL3228-0000
The Beckhoff KL3228 is part of the KL Analog Input Modules series and features 8 inputs, supporting a default sensor type of PT1000. It has an isolation voltage of 500 V and a typical measuring current of 0.5 mA. The module has IP20 protection class and a resolution of 0.1 °C per digit.
Internal Product Review
The KL3228 is a Beckhoff analog input module with 8 inputs, optimized for PT1000 sensing in distributed I/O assemblies. A 0.1 °C/digit resolution and 500 V isolation support accurate, dependable temperature acquisition, making the module a strong choice for precise monitoring.
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Product Description:
The KL3228 is a temperature-measurement terminal manufactured by Beckhoff for the KL Analog Input Modules series. Designed for DIN-rail assemblies inside control cabinets, the module translates resistance variations from connected sensors into numerical values that a PLC can evaluate for closed-loop thermal control. By integrating directly with the K-bus backplane, it eliminates external signal conditioners, shortens installation time, and keeps temperature feedback tightly synchronized with machine logic.
Eight differential channels are available, so the terminal provides 8 inputs that are sampled during every bus cycle. Each channel delivers a resolution of 0.1 °C/digit, supporting precise heating or cooling regulation. Field wiring is galvanically separated from the internal electronics by 500 V of isolation, protecting downstream controllers from common-mode faults. The module electronics draw just 85 mA from the K-bus, leaving ample current for adjacent terminals. The housing occupies only 35 mm of DIN-rail width, helping keep control enclosures compact. Signals are connected with 1-wire wiring, and the terminal places an input process image of eight status bytes and eight data words on the bus. The minimum data length per channel is three bytes, while no output data is required during normal operation. When extended diagnostics are enabled, the output process image expands to eight control bytes and eight data words.
The enclosure carries a protection rating of IP20, and reliable operation is supported at up to 95% relative humidity, provided condensation is avoided. A sensor excitation current of 0.5 mA minimizes self-heating errors that could otherwise affect temperature measurements. The channels are initially scaled for a PT1000 resistance curve, so standard platinum probes can be connected without recalibration. Power for the conversion logic is delivered directly from the K-bus, avoiding the need for a separate supply connection. The module also supports a variable installation position without affecting its thermal behavior.
