ADLINK AMP-20xC Interface Configuration and Wiring Guide

ADLINK AMP-20xC Motion Control Card Interface Configuration and Signal Connection

In the field of industrial automation and motion control, high-speed and high-precision pulse control has always been a core requirement. The AMP-20xC series multi axis motion control card has become the preferred solution for many equipment manufacturers and system integrators due to its rich interface resources, flexible driver compatibility, and powerful encoder feedback processing capabilities. However, in order to fully utilize the performance of the control card, it is necessary to have a deep understanding of its interface definition, signal characteristics, and wiring specifications. This article is based on the hardware manual of AMP-20xC, systematically sorting out the functional allocation, pin signal description, electrical parameters, and typical application wiring methods of all its connectors, providing engineers with a complete technical reference from installation to debugging.

Overview of Control Card Interfaces

The AMP-20xC adopts a modular interface design, with a 100 pin SCSI main connector (P1) onboard for transmitting all motion control commands and feedback signals; Four 26 pin CMP connectors for connecting mainstream servo/stepper drivers; In addition, it is equipped with a laser control interface (CN1), universal I/O screw terminals (J1, J2), trigger output (J3), brake control (J4), main power and emergency stop (J5), isolated digital output (J6), and 37 pin D-SUB expansion I/O (P2). The four 9-pin IOIF screw terminals provide 16 isolated digital inputs and 16 isolated digital outputs. Such a rich interface layout enables AMP-20xC to manage up to 4 axes (standard version) or 8 axes (extended version) simultaneously, covering all necessary signals such as pulse direction control, CW/CCW mode, encoder ABZ feedback, limit/origin switch, servo alarm and enable, etc.

Main connector P1-100 pin SCSI interface detailed explanation

P1 is the most core signal channel between the control card and the external servo/stepper driver. Its 100 pins are grouped according to the axis number, with approximately 20 pins allocated to each axis, supporting a four axis standard configuration. The pin allocation table clearly defines the differential pulse output (OUT+/- and DIR+/-), differential encoder feedback (EA+/-, EB+/-, EZ+/-), servo alarm input (ALM), origin limit input (ORG), positive and negative limit (PEL/MEL), zero speed detection (ZSP), servo enable output (SVON), and universal digital input/output (EDI/EDO) for each axis.

1. Pulse output and directional signal

Each axis is equipped with a pair of differential pulse outputs (OUT+/-) and a pair of differential directional outputs (DIR+/-), for example, axis 1 corresponds to pins 13/14 (OUT1) and 15/16 (DIR1), axis 2 corresponds to pins 17/18 and 19/20, and so on. These differential signals use line driven outputs (such as 26LS31), with a default output type of pulse+direction, but can also be configured through software as CW/CCW forward/reverse pulse pairs. The manual specifically states that it is recommended to connect the OUT -/DIR - terminal to the signal ground terminal of the driver to ensure common mode noise suppression. At the same time, it should be noted that the current flowing through the differential output terminal should not exceed 20mA, otherwise it may damage the driver chip. In practical wiring, it is recommended to use twisted pair shielded wires and ground the shielding layer at one end to reduce high-frequency interference.

2. Encoder feedback input

Each axis contains three pairs of differential inputs (EA+/-, EB+/-, EZ+/-) for receiving incremental encoder signals from servo motors or grating scales. EA and EB have a phase difference of 90 °, used for position counting and direction discrimination; EZ is the zero position pulse for each revolution, used for precise positioning back to the origin. The manual emphasizes that the common mode voltage range of differential input pairs is allowed to be ± 7V, which means that the driver output must provide a differential voltage swing of at least 0.2V, and the maximum input frequency can reach 5MHz or above (depending on the transmission distance and signal conditioning). For encoders that use open collector output, an external pull-up resistor must be connected to convert the signal into differential form; If the driver has a built-in differential line driver, it can be directly connected. When wiring, it is necessary to ensure that the signal ground (DGND) of the control card and the driver are interconnected, otherwise the common mode voltage may exceed the allowable range.

3. Limit, origin, and servo status signals

Each axis provides three input signals: positive limit (PEL), negative limit (MEL), and origin (ORG), all of which are single ended inputs. The default high level is valid (but can be reversed through software). These signals are usually connected to mechanical travel switches or proximity sensors. In addition, the servo alarm input (ALM) and zero speed signal (ZSP) are used to monitor the status of the drive. When ALM is triggered, the control card can immediately stop pulse output. The servo enable output (SVON) is active at a high level and is used to connect the enable circuit of the servo driver.

4. Universal digital I/O

Each axis also includes two sets of universal digital inputs and outputs (EDI1/EDO1 to EDI4/EDO4), distributed on pins 47-50 and 97-100 of P1. Are these I/O isolated or TTL type? According to the subsequent description, EDO is an isolated digital output, but the specific electrical characteristics need to be seen in the descriptions of J6 and IOIF. In fact, the EDO/EDI on P1 belongs to the isolated type, and its common terminals (DICOM, DOCOM) require an external 24V power supply.

Detailed explanation of auxiliary connector functions

1. CMP1~CMP4- Driver specific connection port

These four 26 pin connectors are specifically designed for direct connection to mainstream servo drives such as Mitsubishi J3/J4, Yaskawa Sigma II/III/V, Panasonic MINAS A4/A5, Delta A2, etc. Its internal signal is completely consistent with the corresponding axis of P1, but it provides a more compact wiring solution. If non-standard drivers are used, users can choose single ended open type universal cables and define their own pin functions.

2. J1/J2- Motion I/O screw terminals

Two 10 pin screw terminal blocks, providing EL+(positive limit), EL - (negative limit), ORG (origin), and universal I/O respectively. Actually, J1 and J2 correspond to axis groups 1/2 and 3/4, respectively? From the pin numbers, J1 includes DICOM, EDI3/4, etc. Please refer to the table in the PDF for details. Please note that DICOM must be connected to a+24V external power source, and DOCOM must be connected to an external power ground (IGND). These signals are all optically isolated inputs with strong anti-interference ability.

3. J3- Trigger Output

J3 provides a differential output pair of two trigger signals (TRG1, TRG2), used to generate high-speed pulses when the encoder count value reaches the preset position, commonly used for camera shutter triggering or laser light output control. Its electrical characteristics are similar to pulse output.

4. J4- Brake Control

J4 consists of 4 sets of brake signals (one set per axis), used to control the mechanical brake of the servo motor. Each group contains positive (+) and negative (-) outputs, which can directly drive a 24V electromagnetic brake, but attention should be paid to the current capacity.

5. J5- Main power supply and emergency stop

J5 is the power supply and emergency stop input interface of the control card. Pin 1 is I24V (external+24V power input), Pin 2 is IGND (power ground), Pin 3 is DICOM (digital input common terminal, needs to be connected to+24V), Pin 4 is DOCOM (digital output common terminal, needs to be connected to IGND), and Pin 5 is EMG (emergency stop input). The emergency stop signal uses B-type normally closed contacts. When the EMG is effective (i.e. the contact is disconnected), the control card immediately prohibits all pulse outputs until the fault is resolved. The contact capacity of this switch should be at least+24V/6mA.

6. J6- Isolated Digital Output

J6 provides 4 isolated digital outputs (EDO1~EDO4), designed with MOSFET circuit, with a maximum current of 250mA per channel, which can directly drive small solenoid valves, relays or indicator lights. The output common terminal is DOCOM and must be connected to IGND. Note that these outputs are of the open drain type, and the load needs to be connected to an external pull-up resistor to a 24V power supply.

7. IOIF1~IOIF4- Isolation I/O Expansion

These four 9-pin screw terminals provide a total of 16 isolated digital inputs and 16 isolated digital outputs (each IOIF contains 4 DI and 4 DO), with pin definitions similar to J1/J2 but assigned different axis numbers. These I/O are suitable for long-distance signal transmission, improving the system's anti-interference ability.

8. P2-37 pin D-SUB TTL I/O

P2 is a 16 channel input and 16 channel output for high-speed TTL level, with pins including TDI1~TDI16 (input) and TDO1~TDO16 (output), as well as a+5V power supply and digital ground. These signals are non isolated and suitable for connecting PLC or high-speed counting modules, but attention should be paid to level matching (5V TTL). The manual also mentions that the DO on P2 supports high current (up to 250mA), but requires an external DIO24V power supply (i.e. 24V pull-up), otherwise it cannot provide sufficient driving capability.

Key wiring specifications and precautions

1. Connect the power supply to the common terminal

All isolated inputs (DICOM) must be connected to the positive pole of an external+24V power supply, and all isolated outputs (DOCOM) must be connected to the negative pole of the same power supply (IGND). If different power sources are mixed, it may cause the optocoupler to fail to conduct correctly or be damaged. J5 has provided I24V and IGND terminals, it is recommended to take power from here.

2. Emergency stop circuit design

The EMG signal is a normally closed input, which means that the contact is closed during normal operation and triggers an emergency stop when it is urgently disconnected. If normally open contacts are used, they can be reversed through software configuration logic. Be sure to use an emergency stop switch with sufficient rated current and connect it in series between EMG and DICOM (there is actually an internal pull-up, but the manual does not provide detailed instructions, it is recommended to refer to the schematic diagram). The usual practice is to connect one end of the emergency stop switch to+24V and the other end to the EMG pin.

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.