Hover over image to zoom in


$468.00 (USA and Canada only)

Availability: In stock
SNAP Motion Control Host Communication Module, 16 Axes

Production Specification

The SNAP-SCM-MCH16 motion control host module is a key part of the SNAP PAC Motion Control Subsystem for the SNAP PAC System. Typically, the SNAP-SCM-MCH16 works with a SNAP PAC controller running a PAC Control programming strategy to control up to 16 stepper motors.

A single SNAP-SCM-MCH16 links up to four SNAP-SCM-BB4 motion control breakout boards. Each breakout board is equipped with a Magellan(TM) processor chip set that outputs pulse and direction signals for up to four stepper motor systems.

Part of the SNAP PAC System, the module mounts on a SNAP PAC rack with a SNAP PAC brain or rack-mounted controller. Analog, digital, and serial I/O modules can all be on the same rack. Such an I/O unit is also well suited for PC-based control or for use as intelligent remote I/O for an Allen-Bradley MicroLogix PLC system, or other RSLogix-based system, such as ControlLogix or CompactLogix.

For more information see form #1672, the SNAP PAC Motion Control Subsystem Data Sheet, under the Documents tab.

Build your system in the SNAP I/O Configurator.

Baud rates




Data bits

8 only

Logic supply voltage

5.0 to 5.2 VDC

Logic supply current

250 mA1
500 mA2

Number of ports per module


Maximum number of modules per rack


Maximum cable length, multi-drop

1,000 feet at 115,200 Baud

I/O processor (brain or on-the-rack
controller) compatibility


Operating temperature

-20 to 70 °C

Storage temperature

-30 to 85 °C

Torque, hold-down screws

4 in-lb (0.45 N-m)

Torque, connector screws

5.26 in-lb (0.6 N-m)

Agency Approvals



30 months

1. Each breakout board is powered by a separate power supply.
2. Breakout board uses power from the module.

SNAP Motion Control Subsystem Data Sheet

The SNAP-SCM-MCH16 motion control host module is a serial communication module that links up to four SNAP-SCM-BB4 motion control breakout boards with a SNAP PAC brain or rack-mounted controller. When mounted on a SNAP PAC rack and connected to a breakout board, a single SNAP-SCM-MCH16 module allows a SNAP PAC controller running a PAC Control™ programming strategy to control up to 16 stepper motors.

SNAP PAC System Product Guide

This document lists and describes all Opto 22 SNAP PAC System part numbers, including PAC Project software, SNAP PAC controllers, SNAP PAC brains, and SNAP I/O modules of all kinds. SNAP PAC mounting racks and SNAP power supplies are also listed.

SNAP PAC Motion Control User's Guide

This guide shows you how to install and use the SNAP PAC Motion Control Subsystem, which provides an integrated hardware and software toolset for controlling multi-axis stepper motors. The SNAP PAC Motion Control Subsystem consists of a SNAP-SCM-BB4 breakout board working with the SNAP-SCM-MCH16 host communication module and a free library of motion commands, which are used with Opto 22 PAC Control software.

Case Study: Upgrading Motion Control System

Since the introduction of G4 input/output modules in the mid-1980s, Opto 22 has sold millions. And 20 years later, these remain some of the company’s best-selling products. Like most Opto 22 modules, G4’s are guaranteed for life. In order to make this guarantee, the company must submit the modules to rigorous testing before they’re shipped to customers.

The G4 Handler is the machine used to perform these tests. When the 20-year-old servos on the G4 Handler needed to be replaced, an economical replacement could not be found. Instead, the G4 Handler’s servo motors were replaced with stepper motors.

Watch the G4 Handler video case study.

This case study describes how the SNAP PAC System Motion Control Subsystem was used with the new stepper motors to control module testing and gather test data.

Opto 22 RoHS 3 Statement of Compliance - Restriction of Hazardous Substances

This document is a statement of compliance with the EU Directive 2015/863/EU, Restriction of Hazardous Substances (RoHS 3). This document lists Opto 22 products that comply with the substance restrictions of the RoHS 3 directive.

UL Approval Document

This document lists all Opto 22 part numbers that have the Underwriters Laboratory (UL) approval.

CE Declaration: Low Voltage

This document is the Manufacturer's Declaration for the listed products as mentioned in the attachment - to which this confirmation refers - that they are in accordance with the mentioned European, international and/or national standards and regulations.

Sample Motion Control Strategies

The Motion Control example strategies show how to achieve four different motion control maneuvers using OptoMotion commands in a PAC Control strategy. You can use the example strategies as a starting point for creating your own control strategies.

These are sample files. Before you download, read the Legal Agreement.

SNAP-SCM-MCH16 Counts/Cycle Conversion Formulas

If you are using motion commands with the SNAP PAC Motion Control Subsystem, use the conversion formulas on this table to convert Counts/Cycle which is used by some of the motion commands.

Before you download, read the Legal Agreements.

Video: Securing SNAP Module

A quick overview on securing a SNAP Module to a SNAP rack.

Video: Removing a SNAP Module

A quick overview on removing a SNAP module.

Accuracy vs Resolution

What's the difference between accuracy and resolution in analog I/O specifications? Try your own specs in the calculator.