KL5101-1100 Beckhoff
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The Beckhoff KL5101-1100 is a module from the KL Analog Input Modules series and features a 16-bit binary counter format with a maximum count rate of 4 million increments per second. It provides one encoder plus one input channel, supports DIFF RS422 and TTL encoder signals at 5 V DC, and operates with a 24 V DC power supply. The module measures 24 x 100 x 68 mm, has an IP20 protection rating, and is made of polycarbonate.
Internal Product Review
The KL5101-1100 is a Beckhoff encoder interface module with 1 encoder + 1 input, suited for streamlined motion feedback tasks. Support for DIFF RS422 and TTL signals gives this terminal strong compatibility across common encoder platforms. A 4 million increments/s count rate paired with 200 ns period resolution makes this module an excellent choice for fast, accurate encoder evaluation.
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Product Description:
The KL5101-1100 is an incremental encoder interface module from Beckhoff that belongs to the KL Analog Input Modules series. Within a PC-based control system, it sits on the Bus Terminal rail and converts encoder feedback into mapped process data for the PLC. By counting quadrature pulses, the unit provides position and speed information needed for motion axes, conveyors, and synchronized machinery. Its single-channel design integrates directly beside digital and analog terminals, eliminating external counter boards in distributed automation cabinets.
The counter logic stores values in a 16-bit binary register and evaluates incoming DIFF-RS422 TTL signals at up to 4 million increments/s. A programmable period timer with 200 ns granularity supports precise velocity calculation, while selectable 1-, 2-, or 4-fold quadrature evaluation adapts the module to different encoder resolutions. The interface exposes one combined channel described as 1 encoder + 1 input, so the zero pulse or an external marker can be latched without additional hardware. Process images of 6 bytes in, 6 bytes out transfer the captured count, period, and status bits in each cycle. The zero-pulse latch is 16-bit, and the separate gate/latch line accepts 24 V DC to freeze the counter synchronously with other field signals.
Power for the terminal comes from the system supply at 24 V DC, and the module can source up to 0.5 A to the attached encoder while maintaining the regulated 5 V DC level required by most TTL sensors and the dedicated status input line. A polycarbonate housing with a protection rating of IP20 encloses the electronics and snaps onto the DIN rail. Overall dimensions are 24 × 100 × 68 mm, matching the depth of adjacent terminals. These physical features simplify wiring and allow high-density installation in compact control enclosures.
