ADLINK AMP-20xC Interface Configuration and Wiring Guide

3. Differential signal transmission rules

For differential pairs such as OUT, DIR, TRG, and encoder feedback, it is recommended to use twisted pair or shielded twisted pair and ground the shielding layer at a single point on the control card end. Try to keep the differential lines as long as possible to avoid introducing phase deviation. For long-distance transmission (>10 meters), low capacitance cables should be selected and the pulse frequency should be appropriately reduced.

4. Load limit for high current output

Although the digital outputs (EDO and TDO) on J6 and P2 support 250mA current, it should be noted that the total current should not exceed the overall heat dissipation capacity of the control card. At the same time, when driving inductive loads (such as relays), a freewheeling diode must be connected in parallel to prevent back electromotive force from damaging MOSFETs. The manual clearly states that when using the DO function, the DIO24V terminal must be connected to+24V, otherwise the output cannot be effectively pulled down.

5. Level compatibility of encoder signals

Due to the wide common mode range of differential input up to ± 7V, it can be compatible with RS-422, RS-485, and even some 5V or 24V differential signals (requiring series connection of current limiting resistors). But if the driver output is single ended (such as open collector), it needs to be converted into a differential signal. It is recommended to use line drivers such as AM26LS31.

Common problem diagnosis and solution ideas

Pulse output unresponsive: Check if SVON is set high, ALM is valid, EMG is closed, and limit switch is triggered.

Encoder counting error: Check if the differential signal connection is reversed (reverse connection of EA+and EA - will cause the counting direction to reverse, but can be reversed through software), if the shielding layer is properly grounded, and if the power noise is too high.

Digital output without action: Confirm that DOCOM is connected to IGND and the load power supply is correctly connected; For the TTL output of P2, it is necessary to confirm that the+5V power supply is normal.

Unable to recover after emergency stop: software reset is required to clear the emergency state, or power on again.