ADLINK MNET-4XMO/C Motion Module Installation and Debugging Guide

ADLINK MNET-4XMO/C Distributed Motion Module Installation and Debugging Guide

ADLINK MNET-4XMO and MNET-4XMO-C are 4-axis slave modules designed for Motionnet distributed motion control systems. They are based on ASIC motion control cores and support up to 9.9 MHz pulse output and 20 MHz encoder feedback (4 × AB mode). They provide linear/S-curve acceleration and deceleration, 2-4 axis linear interpolation, 2-axis arc interpolation, 13 zeroing modes, and rich servo interface signals (SVON, INP, ALM, ERC, etc.). The MNET-4XMO-C model additionally integrates high-speed position comparison and trigger output functions (up to 1 MHz single axis trigger or 100 kHz four axis trigger), suitable for scenarios such as AOI detection, aerial positioning, and continuous path motion. This article is based on the user manual, systematically reviewing hardware installation, dip switch configuration, signal wiring, motion mode selection, continuous triggering and path movement function applications, as well as the use of MotionCreatorPro 2 debugging tool to help motion control engineers quickly complete on-site deployment and troubleshooting.

Product positioning and model differences

MNET-4XMO is a universal 4-axis pulse motion control module that communicates with the main station (such as PCI-7856 or DB-8153) through Motionnet high-speed serial bus (20 Mbps). A single main station can mount up to 64 modules (with a total of 256 axes). Its core motion functions are implemented by the NPM PCL6046 series ASIC, including:

32-bit instruction/feedback counter, 16 bit acceleration/deceleration time setting

Position/velocity coverage (on the fly change)

Triangle speed automatic suppression (small stroke automatic deceleration)

Vibration suppression (reducing mechanical oscillation during pauses)

MNET-4XMO-C adds:

5 32-bit comparators per axis (20 in total), supporting position comparison triggering

Table mode (8192 preset points per axis) and linear mode (start+step+number of times)

Ultra high speed trigger channel (only for the first axis, 1 MHz)

Path Move function: up to 2048 points, supports continuous speed automatic connection

Fast Index Move: Pre stored motion parameters, quickly launched only through index numbers

Selection suggestion: If only basic point motion and interpolation are needed, the standard version is sufficient; If you need to trigger the camera or perform aerial photography, you must choose the C model.

Hardware installation and switch settings

2.1 Module Layout and Interfaces

The main interfaces of the module include:

J8: External 24V power input (E24V), I/O common terminal (DICOM), emergency stop input (EMG)

HS1/HS2: RJ-45 sports network cascade port (4/5 pins are DATA -/DATA+)

CN1: Differential output of brake signals (Brake1-4)

IOIF1~IOIF4: Mechanical I/O and GPIO (including PEL, MEL, ORG, DI/DO, CMP ±, etc.)

CM1~CM4: Servo interface (including OUT ±/DIR ± differential pulse, EA ±/EB ±/EZ ± encoder feedback, SVON, INP, ALM, ERC, RDY, EMG, etc.)

2.2 Key dialing and jumper settings (S1~S7, JP4~JP6)

Correctly configuring the following switches is a prerequisite for stable system operation:

Switch Function Description

S1 slave station ID setting binary dialing code, range 0~63, must be unique within the same master station

S2 communication rate can be selected as 2.5/5/10/20 MHz, it is recommended to be consistent with the main station and slow down over long distances

When the S3/S5 reset servo alarm signal is enabled ON, the DO signal of IOIF is connected to the RST pin of CM for automatic reset of the driver alarm

If the S6 terminal resistor (TMR) and TUD module are located at the end of the Motionnet line, TMR (120 Ω) needs to be enabled; TUD is a pull-up/pull-down setting, usually kept as default

S7 FGND grounding selection connects the shielding layers of CM1~4 to the chassis ground (FGND) to improve anti-interference

If the JP4 EMG signal is short circuited, the EMG input will take effect. Otherwise, it will be disabled (use with caution)

JP5/JP6 power mode selection: whether E24V (module power supply) and I24V (I/O power supply) are shared. If the external I/O is isolated from the module power supply, it is set as "different power supply"; If the same 24V source is shared, it is short circuited as' shared '.

2.3 Wiring precautions

Differential pulse output (OUT ±/DIR ±): driven by 26LS31, the single ended ground current should not exceed 20mA, otherwise the chip will be damaged. Recommend using OUT - and DIR - to connect drivers (see manual diagram).

Encoder feedback (EA ±/EB ±/EZ ±): differential input, common mode voltage ± 7V. The longest cable depends on the frequency, and it is recommended to use twisted pair shielded wires with a single end grounded shield layer.

Emergency stop (EMG): using B-type (normally closed) contacts, 24V/6mA or above, with software configurable polarity.

Limit/Origin (PEL/MEL/ORG): Switch capacity 24V/6mA, can be set to normally open or normally closed by software.

Detailed explanation and programming points of sports modes

3.1 Single axis speed/point motion

Speed mode: APS-velocitymoving () continuously outputs pulses until a stop command is received, supporting T/S curves.

Point mode: APS-relative_mave() and APS_obsolute_mov() perform relative/absolute positioning, and automatically handle small stroke trigonometric velocities internally.

Speed/Position Coverage: Calling the above function again during motion can instantly change the target speed or position (on the fly).

3.2 Interpolation motion (2-4 axes)

Linear interpolation: APS_obsolute_linear_move()/APS_delative-linear_move(), supports any combination of 2/3/4 axes, and the velocity parameter is the synthesized vector velocity.

Arc interpolation: APS_ absolute | arc_move()/APS_ radive_ arc_move(), only supports 2 axes, requires specifying the center point (absolute or relative offset) and rotation angle (clockwise or counterclockwise).

The acceleration and deceleration parameters (PRA-ACC/DEC) of the main axis (index minimum axis) are used as the common acceleration and deceleration time for interpolation.

3.3 Zero return mode (13 types)

The module provides 13 automatic zeroing modes (Home mode=20~32, pages 77~88 of the manual), covering:

Stop and reset the counter based on the rising/falling edge of the ORG signal

Accurate positioning based on EZ (Encoder Index) signal

First touch the EL limit and then reverse search ORG/EZ

Support two-stage "search speed" and "crawling speed"

After returning to zero, the ERC signal is automatically output to clear the servo drive deviation counter.

MNET-4XMO-C Advanced Features (Continuous Trigger and Path Movement)

4.1 Continuous Trigger for Position Comparison

This function is used to output a trigger pulse when the encoder count value reaches the preset point during motion, commonly used to trigger camera capture or light source flicker.

Two comparison source modes:

Linear mode: Set the starting position, step interval, and trigger frequency, and the hardware automatically generates equidistant trigger sequences with a maximum trigger frequency of 100 kHz (four axes) or 1 MHz (only the first axis ultra high speed).

Table mode: Preset up to 8192 non-uniform position points, matched in order.

Trigger output signal: CMP+/- differential pair (located on pins 7/8 of IOIF), programmable pulse width (0.1 μ s~1s), output logic can be set to normal high/low or flip mode.

Configuration process (via the Compare Trigger page or API of MotionCreatorPro 2):

Select comparison source (instruction counter or encoder feedback counter)

Set comparison direction (upward/downward/bidirectional)

Select mode (disable/always compare/forward only/reverse only/greater/less than)

Fill in linear parameters (Start, Repeat, Interval) or load a table file

Enable and start movement

4.2 Path Move

This function allows the point data of a continuous trajectory (including straight lines, arcs, and stops) to be pre stored in the onboard SRAM. The module automatically executes in sequence and smoothly connects the speed (maintaining a constant speed) without frequent intervention from the host.

Maximum points: 2048 (single axis) or reduced by interpolation dimension (1024 for 2-axis, 682 for 3-axis, 512 for 4-axis)

Support Dwell command, speed first decreases and then increases

Automatic speed planning: When the target speed of adjacent segments changes, the appropriate starting speed is automatically calculated to ensure a smooth transition

Mutually exclusive with fast indexing mode, cannot be enabled simultaneously

4.3 Fast Index Move

Pre store various motion parameters (type, axis, distance, speed, etc.) in different index positions of SRAM, and only send index numbers when starting, greatly reducing communication overhead and suitable for frequent execution of fixed actions (such as step-by-step repeated positioning).

MotionCreatorPro 2 Debugging Tool

This Windows tool (supporting 2000/XP/Vista, resolutions above 1024 × 768) is used to configure, test, and diagnose the entire Motionnet system.

Main functional pages:

Parameter management: Set acceleration and deceleration, start stop speed, curve type, limit logic, etc. for each axis, which can be saved as a file or written to Flash.

Single axis motion: Manually execute relative/absolute/velocity motion, real-time display of command position, feedback position, tracking error, speed, and support for I/O status monitoring.

Return to zero: Select 13 modes, set search/crawl speed, and observe the timing diagram for verification.

Interpolation: 2-4 axis straight lines, 2-axis arcs, with adjustable starting and ending points and center points.

Point Table (CNC): Edit a 2D point table (supports linear/circular/stationary), preview motion trajectories, and execute continuous path movements.

Comparison trigger (CmpTrg): Configure linear/table comparison parameters, monitor trigger counts, and manually force trigger tests.

High speed comparator: dedicated for triggering the first axis ultra high speed (1 MHz), setting the encoder mode and filter.

Connection management: Connect to the master station through the Field Bus Connect/Disconnect button, select the baud rate, identify all slave modules, and the status light displays communication normal/fault.

Common troubleshooting and solutions

6.1 Module not powered on or communication failure

Check if the E24V and EGND of J8 are connected to a 24V power supply (± 5%), and if the orange LED is on.

Confirm that the S1 slave ID is not duplicated and that the S2 baud rate is consistent with the master station.

The network cable uses CAT5e or CAT6 STP, with a length of no more than 100m (32 modules at 20 Mbps), and the terminal module S6 has a terminal resistor turned on.

Check that the DATA+/DATA - connections of HS1/HS2 are correct (4/5 pins), and that the shielding layer is grounded at one end.

6.2 Motor not rotating or abnormal pulse output

Check if the OUT ±/DIR ± of the CM interface is connected to the driver in a differential manner, and confirm that the driver pulse input mode (CW/CCW or pulse+direction) matches the module settings (through parameter configuration).

Measure the OUT+/- signal with an oscilloscope to confirm pulse output; If not, check if the motion command has been executed (check the status bit in APS_motion-status).

Confirm that the SVON signal is enabled (driver servo on) and the ALM signal is not activated (otherwise stop pulse).

6.3 Encoder feedback reading abnormality

Check the polarity of the EA ±/EB ±/EZ ± wiring, reverse connection can cause incorrect counting direction or reading jump.

Confirm encoder type (differential/single ended) and voltage matching, with common mode voltage within ± 7V.

If the frequency is high, try reducing the communication rate or installing a filter (S6 related settings).

6.4 Trigger output without signal (C model)

Confirm that the comparison mode is enabled and the comparison position is within the range of motion.

Check if the CMP+/- differential output is connected to an external load (such as an optocoupler) and if the pulse width is too narrow (recommended to be ≥ 1 μ s).

Manually trigger the test in MotionCreatorPro 2 to confirm that the hardware channel is functioning properly.

If using table mode, confirm that the table data has been downloaded and the pointer has not exceeded the limit.

6.5 Return to zero position deviation

Check if the ORG signal logic (normally open/normally closed) setting is consistent with the actual switch.

Confirm that the zero return mode selection is correct (e.g. whether an EZ signal is required).

Check if the zeroing speed is too high, causing mechanical overshoot and reducing crawling speed.

6.6 Uneven path movement speed

Confirm that the distance between each segment is sufficient to complete acceleration and deceleration. If the distance is too short, it will trigger automatic adjustment of the triangle speed, which can shorten the acceleration and deceleration time or increase the segment length.

Check if the dwell point is set and its forward and backward speeds automatically decrease to zero.

Key points of software API development

Initialization: You need to first call the master initialization function (such as APS_initial() of PCI-7856), and then enumerate the slave stations through APS_get-slave.list().

Axis parameter settings: Use APS_det_axis_param() to configure acceleration and deceleration, start stop speed, curve type, limit logic, electronic gears, etc., which must be completed before movement.

Motion start: After calling the corresponding motion function, poll the completion status through APS_motion-status() or use interrupt events.

Error handling: The function returns a negative error code, as described in section 6.4 of the manual (-1~-1000). Common errors include -15 (previous command not completed) and -17 (slave not found).

Continuous triggering API: The C model provides functions such as APS_cmp_det_table(), APS_cmp_det_linear(), APS_cmp_deable(), etc.

Maintenance and spare parts recommendations

Regularly check whether the terminal block screws are loose, especially in vibration environments.

Clean the gold finger and RJ-45 connector with alcohol every six months.

Spare a high-quality Motionnet Ethernet cable and a set of power terminals for quick replacement of faulty links.

Backup the configuration files (. ini and. mdb) of MotionCreatorPro 2 to the network for easy cloning of configurations across multiple devices.