EL5122 Beckhoff
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The Beckhoff EL5122 is part of the EL EtherCAT Terminals series and offers 2 channels for encoder connection with a 16 or 32 bit counter width. It supports TTL and open collector signals, providing a signal interface of 5 V single-ended and a cut-off frequency of up to 1 MHz for TTL. The device features an encoder supply voltage of 5, 12, or 24 VDC with a typical E-bus current of 190 mA and is rated IP20 for protection.
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Product Description:
The EL5122 is a dual-channel incremental encoder interface terminal produced by Beckhoff for the EL EtherCAT Terminals series. Installed on the EtherCAT I/O rack, it receives differential or single-ended quadrature signals from field-mounted encoders. The terminal forwards position or speed data to the bus controller for deterministic motion control tasks in industrial automation. This arrangement lets the module act as the direct link between encoder feedback hardware and the control system. It is suited to machine axes that require direct feedback monitoring through the I/O system.
Each count register can be configured for 16/32 bit depth, giving the controller flexibility to match the required measurement range. The terminal resolves time between successive edges down to 10 ns, and its internal processing can be updated every 100 µs, enabling tight position loops. For TTL sources, the input bandwidth reaches 1 MHz, while open-collector devices are accepted up to 100 kHz with an internal 1 kΩ pull-up to 5 V. Signal levels are handled through a 5 V single-ended interface, and the terminal supports quadrature evaluation at 1x/2x/4x to multiply resolution without extra hardware. These functions help the control system interpret fast-changing encoder feedback with consistent timing.
The module provides two encoder sockets wired for 2 × A,B phases, plus a 24 VDC gate/latch input for position capture. A shared sensor feed supplies encoders with 5/12/24 VDC at up to 0.3 A total, while the EtherCAT backplane draws only 190 mA, minimizing cabinet power demand. Two independent channels permit simultaneous monitoring of separate axes, and the counter width, evaluation factor, and cutoff limits are set per channel through the PLC. Supported signal types include TTL and open collector, so external pull-up resistors are unnecessary for open-collector devices. The terminal carries an IP20 rating for installation inside a control enclosure. The gate/latch input also allows the controller to capture position data at a defined external event.
Frequently Asked Questions about EL5122:
Q: How many encoder channels does the Beckhoff EL5122 terminal support?
A: The EL5122 terminal supports two encoder channels, allowing for simultaneous connection of two incremental encoders.
Q: What encoder supply voltages are available on the Beckhoff EL5122?
A: The EL5122 provides an encoder supply voltage selection of 5, 12, or 24 VDC for flexible encoder compatibility.
Q: What is the period resolution of the Beckhoff EL5122 terminal?
A: This terminal offers a period resolution of 10 nanoseconds, supporting high-precision measurement tasks.
Q: What is the maximum input frequency for signals on the EL5122 terminal?
A: The EL5122 can handle TTL signals up to 1 MHz and open collector signals up to 100 kHz, ensuring broad encoder support.
Q: What is the protection rating of the Beckhoff EL5122 terminal?
A: The EL5122 features a protection rating of IP20, suitable for control cabinet installation environments.
