由于其紧凑性和低价格点，增量编码器在许多应用中都变得不可或缺。Beckhoff通过RS422和TTL信号分析了5 V增量编码器的综合el51xx系列，满足了这一重要需求。这四个新的高性能I / O形式具有极高的快速控制（XFC）技术，并使控制器中的增量信号进行分析，以更高节省空间和经济高效的方式。
Beckhoff’s EtherCAT terminalsacquire incremental signals with high frequencies up to 5 MHz and feature many parameterization options and integrated functions that enable optimum adaptation to control tasks. Each terminal offers an integrated sensor supply, which is parameterizable to 5, 12 or 24 V. Users can easily connect encoders with differential RS422, 5 V TTL or open collector interfaces. Based on internal pull-up resistors, no external wiring is required for open collector analysis. Additional 24 V digital inputs can save, lock and set the counter value. The EL51xx series now includes:
•EL5102：2通道增量编码器界面，5 V（RS422，TTL，开放收集器）
• EL5112: 2-channel incremental encoder interface, 5 V (2 x AB or 1 x ABC RS422, TTL, open collector)
• EL5122: 2-channel incremental encoder interface, 5 V single-ended (TTL, open collector)
• EL5131: 1-channel incremental encoder interface, 5 V with two parameterizable 24 V DC outputs
A wide range of additional integrated functions, such as rotary axis functionality, workpiece measurement and standstill monitoring enable data pre-processing directly in the I/O terminals. The measurement of period, frequency and speed with a resolution of 10 ns is also available. In addition, the terminals implement a duty cycle measurement of the incoming signal. Due to the optional interpolating micro-increment functionality, the EL51xx terminals can determine even more precise axis positions for dynamic axes. The synchronous reading of the position values with other process data in the EtherCAT system occurs via the high-precision EtherCAT distributed clocks. This enables simple and precise synchronization of controller tasks.
