Up to six integrated drives in one stand-alone controller
Additional external drive axes can be added to provide up to nine axes of coordinated motion
Controller architecture capable of coordinating motion of up to five independent tasks
Capable of driving and controlling linear or rotary brushless, DC brush servo, and micro-stepping motors
Complete motion capabilities include: point-to-point, linear and circular interpolation, electronic gearing, velocity profiling
Program in AeroBasic with the IDE, Microsoft .NET including C#, VB.NET, C++/CLI, LabVIEW, and MATLAB
Remote ASCII interface provided for Windows or non-Windows programs (including Linux) to command the Epaq through standard Ethernet or RS-232 port
Advanced Windows-based remote diagnostics, tuning, and programming interface software
Front panel display and control pad for convenient menu-driven axis control and status checking
Axis jogging/control with optional joystick
CE approved; follows the 2011/65/EU RoHS 2 Directive
Fully compatible with EPICS set of software tools and applications, making Ensemble ideal for use in synchrotron and general laboratory facilities
Allen-Bradley EtherNet/IP interface provides full integration with the Ensemble; program the Ensemble directly from RSLogix 5000
The Ensemble® Epaq is Aerotech’s next-generation, stand-alone controller for moderate- to high-performance applications. It offers functionality appropriate for applications from basic laboratory experimentation and general purpose positioning to advanced OEM systems at an affordable price.
The Ensemble Epaq is offered in a 6-axis desktop (rack-mount optional) version with display and jog pad. It contains integrated power supplies and pluggable motor and IO connectors. PWM amplifiers are offered to control brush, brushless, and stepper motors. Linear amplifiers are also available for high performance, low noise applications. Higher power external amplifiers may be daisy-chained to the Epaq using the high-speed AeroNet serial interface for a total of nine axes of coordinated motion.
This flexible configuration style allows users to seamlessly mix and match drive types (linear versus PWM, brush or brushless, stepper, etc.) within the same positioning system using a common programming and control platform.
Multiple Epaqs can be controlled from one Windows® PC through Ethernet or USB. Optional on-board encoder interpolation offers the user programmable axis resolution (assuming a sine-wave encoder input signal), including the ability to change interpolation (multiplication) values through software.
Unlike most controllers on the market today, there is no need to understand a cryptic command set to generate motion. The intuitive interface allows a user to begin programming immediately. Ensemble online help further simplifies writing motion programs and includes many functional examples that can be easily modified for customer applications.
The Ensemble with Integrated Development Environment software offers a graphical user interface in Windows®, featuring an intuitive Program Editor, Variable Output window, Compiler Output window, and Task State monitor. This interface enables users to easily monitor all aspects of their positioning system, no matter how complex. The Axis Control and Diagnostic screens are further supplemented by a fully functional Autotuning utility that minimizes startup time and allows easy optimization of motion axes. System diagnostics are easily read from the interface. The Windows-based remote software package is included with each unit, which allows the user to /upload/download programs, modify parameter files, and analyze motion with Aerotech’s advanced graphical tuning package, all from the convenience of a remote PC.
Whether operated in stand-alone mode through the front panel or by remote control through Ethernet or USB, the full functionality of the Ensemble Epaq is available. On-board configuration and monitoring utilities simplify remote communications. To allow easy serial connectivity and ease of use, the Epaq features an RS-232 port (additional RS-232 port is an option).
Integrated Amplifier Electrical Specifications | MP | ML | |
---|---|---|---|
Output Voltage | VDC | 24 V, 48 V, 54 V, 90 V options | 10-40 V (Bipolar) |
Peak Output Current | A | 10 | 10(1) |
Continuous Output Current | A | 5 | 5(1) |
PWM Switching Frequency | kHz | 20 | N/A |
Power Amplifier Bandwidth | kHz | Software Selectable | Software Selectable |
Minimum Load Inductance | mH | 0.1 @ 54 VDC | 0 |
Operating Temperature | °C | 0 to 50 | 0 to 50 |
Storage Temperature | °C | -20 to 85 | -20 to 85 |
Weight | kg | 0.5 | 0.5 |
Actual current ratings dependent on motor resistance.
The Ensemble Epaq uses the processing power of multiple double precision, floating-point DSPs to offer exceptional performance in a variety of applications, including point-to-point motion, linear and circular interpolation, single- and multi-axis error correction, direct commutation of linear and rotary brushless servomotors, and on-board servo autotuning. High-speed interrupts and data logging capabilities provide a real-time link to external systems. The Ensemble Epaq also offers high-speed position latching capability and optional single-axis PSO (Position Synchronized Output). Whether the requirement is simple point-to-point motion or complex velocity profiled contours with output on the fly, Ensemble ensures peak performance for critical applications.
Brushless servo, DC brush servo, and microstepping drives are integrated into the Ensemble Epaq compact frame. The Epaq can control any combination of up to six integral drives, while the Ensemble architecture is capable of further expansion (with external stand-alone, single-axis drive units) to up to nine total axes. Because the Epaq can control many different types of motors, customers have excellent flexibility in their system designs. High accuracy linear motor air-bearings can be controlled from the same controller running lower precision drives with servo or stepper motors. Parameters are easily reconfigured for these various motors and feedback devices, so customers can adapt to changing system needs.
Each Epaq features an optional second RS-232 port, and an axis expansion port. On a per axis basis the Epaq also features an optional I/O package offering eight digital inputs and outputs, one 12-bit ±10 VDC analog input, one 16-bit ±5 VDC output, a configurable brake output, a second TTL encoder input for dual loop control, and either a second marker input or PSO output. This optional I/O package can be added to each axis so numerous I/O can be connected to the Epaq.
Although Ensemble is envisioned as a general-purpose, stand-alone controller, it carries forward a legacy of success built from Aerotech’s hugely successful A3200 and Soloist™ controllers. It offers enhanced capabilities that make it an ideal choice for many aggressive motion control applications. The Ensemble motion control architecture builds upon the Soloist intuitive graphical user interface, while offering advanced features appropriate for multi-axis control. Pre-coded LabVIEW® VIs, AeroBasic™ programming functionality, MATLAB® library, .NET tools for C#, VB.NET and C++/CLI or C make the Ensemble even easier to use. See the Ensemble Control home page for detailed information on software capabilities and ordering options.
Combine proven PLC with proven motion control for easier integration, startup, and maintenance of medium- and high-end automation projects. The Aerotech EtherNet/IP™ interface enables AB PLCs (MicroLogix, CompactLogix™,or ControlLogix) to be integrated directly with the Ensemble. Motion can be directly programmed in the RSLogix 5000 environment or separate programs can be written on the controller and triggered from the AB PLC. Aerotech has two interfaces: ASCII and Register. Choose the PLC, motion controller, and interface that best fits your application needs.
Each Ensemble installation includes full compatibility with the EPICS open source distributed control system. EPICS is used worldwide at leading light source (synchrotron) facilities and other government laboratories, allowing Ensemble to seamlessly integrate into applications at all major research institutions.
Peak value of the sine wave; rms current for AC motors is 0.707 * Apk. Requires I/O option. Effective multiplication factor after quadrature decoding (if applicable). Up to 10 kHz servo update rate for all axes Digital servo loop One 10/100 base T Ethernet port, one USB 2.0 port, one RS-232 port Dedicated I/O per axis includes: CW, CCW, and home limits, marker, Hall effect sensors, enable, fault, for each axis User defined I/O includes eight opto-isolated inputs (sinking or sourcing), eight outputs (sinking or sourcing), one 12-bit analog input, one 16-bit analog output and brake relay; this I/O is on Axis 1; optional adder for axes 2-6 Up to 10 kHz servo update rate for all axes Digital servo loop One 10/100 base T Ethernet port, one USB 2.0 Port, one RS-232 port Dedicated I/O per axis includes: CW, CCW, and home limits, marker, Hall effect sensors, enable, fault, for each axis User defined I/O includes eight opto-isolated inputs (sinking or sourcing), eight outputs (sinking or sourcing), one 12-bit analog input, one 16-bit analog output and brake relay; this I/O is on Axis 1; optional adder for axes 2-6 Effective multiplication factor specified after quadrature decoding (if applicable). Effective multiplication factor specified after quadrature decoding (if applicable). Effective multiplication factor specified after quadrature decoding (if applicable). Effective multiplication factor specified after quadrature decoding (if applicable). Motor type: brushless Motor/stage connector: 4-pin high power D Amplifier connector: 4-pin terminal strip Epaq connector Maximum cable length: 45 meters Minimum bend radius 60 mm (2.36") Rated for continuous flex BL MTR-FLB-4DU-HF60-4ARMS-MAX 450DM Aerotech offers both standard and custom integration services to help you get your system fully operational as quickly as possible. The following standard integration options are available for this system. Please consult Aerotech if you are unsure what level of integration is required, or if you desire custom integration support with your system.Specifications
Ensemble Epaq Specifications
Feature Units Description Number of Axes 1 to 6 Encoder Inputs 1 to 6 Motor Style Brush, Brushless, Stepper Power Supply VAC 100/115/200/230 VAC; 50/60 Hz (Factory Configured) Bus Voltage VDC 40, 40LP, 80, 80LP, 10B, 20B, 30B, 40B Peak Output Current (1 sec)(1) Apk 10 Continuous Output Current(1) Apk 5 Digital Inputs No Digital Outputs No Analog Inputs One 16-bit Analog Input per Axis Analog Outputs No Dedicated Axis I/O on Feedback Connector Three Limit Inputs (CW, CCW, Home); Three Hall Effect Inputs (A, B, C); Three High-Speed Differential Inputs (sin, cos, mkr for encoder); Motor Over-Temperature Input; One 16-bit Analog Input Dedicated I/O on Auxiliary Feedback Connector sin, cos, mkr for Aux Enc; Aux Enc can be used for PSO Output I/O Expansion Board(2) One 12-bit Differential Analog Input; One 16-bit Analog Output; Eight Digital Inputs, Optically Isolated, Sinking or Sourcing; Eight Optically Isolated Digital Outputs per Axis High Speed Data Capture Yes(2) High Speed Digital Outputs No BiDirectional Lines No Automatic Brake Control Optional Emergency Stop (ESTOP) Optional Position Synchronized Output (PSO) Single Axis Standard Can Output Multiplied Encoder Yes (only with MXH option) Can Output Square Wave Encoder Yes Primary Encoder Input Frequency with Multiplication 200 kHz (MXU) or 450 kHz (MXH) sine wave Primary Encoder Input Frequency Square Wave 10 MHz square wave frequency/40 MHz count rate Secondary Encoder Input Frequency 10 MHz square wave frequency/40 MHz count rate Laser Feedback Support No Encoder Multiplication(3) x4096 (MXU); x65536 (MXH) Resolver Interface No Internal Shunt Resistor No External Shunt No Ethernet Yes USB Yes RS-232 Yes FireWire No Fieldbus Modbus TCP on PC Joystick Yes Additional Interfaces 10/100 Base T Ethernet communication interface for system setup, application networking, Epaq-to-Epaq communications, embedded programming, immediate commands, and Modbus over TCP; USB communication interface for system setup, application networking, Windows® PC control interface; RS-232 port with programmable baud rate, length, parity, stop bits (second RS-232 port optional) ESTOP to Stop All Axes Display: Backlit 8 x 40 Character LCD Keypad: 5-Key Input Pad Current Loop Update Rate kHz 20 Servo Loop Update Rate kHz 1 to 20 Power Amplifier Bandwidth kHz Selectable Through Software Minimum Load Inductance mH 0.1 mH with PWM; 0 with Linear Operating Temperature °C 0 to 50 Storage Temperature °C -30 to 85 Weight kg (lb) 10 (22) Package Desktop or Rackmount Standards CE approved, 2011/65/EU RoHS 2 Directive Dimensions
Ordering Information
Ordering Example
Ensemble Epaq -S /A 40 /1-MP10I /2-MP10 /3-MP10 /4-MP10 /5-MP10 /6-MP10 /US-115VAC /Brake-2 /RS232-2 Ordering Options
Base Package Line
VoltageBus Power
SupplyAxis 1
AmpAxis 2
AmpAxis 3
AmpAxis 4
AmpAxis 5
AmpAxis 6
AmpEnsemble Epaq -S
-R/A
/B
/C
/D40
40LP
80
80LP
10B
20B
30B
40B/1-MP10I
/1-MP10MI
/1-ML10I
/1-ML10MI
/1-ML10HI/2-MP10
/2-MP10I
/2-MP10M
/2-MP10MI
/2-BLANK
/2-BLANKW
/2-ML10
/2-ML10I
/2-ML10MI
/2-ML10M
/2-ML10HI
/2-ML10H/3-MP10
/3-MP10I
/3-MP10M
/3-MP10MI
/3-BLANK
/3-BLANKW
/3-ML10
/3-ML10I
/3-ML10MI
/3-ML10M
/3-ML10HI
/3-ML10H/4-MP10
/4-MP10I
/4-MP10M
/4-MP10MI
/4-BLANK
/4-BLANKW
/4-ML10
/4-ML10I
/4-ML10MI
/4-ML10M
/4-ML10HI
/4-ML10H/5-MP10
/5-MP10I
/5-MP10M
/5-MP10MI
/5-BLANK
/5-BLANKW
/5-ML10
/5-ML10I
/5-ML10MI
/5-ML10M
/5-ML10HI
/5-ML10H/6-MP10
/6-MP10I
/6-MP10M
/6-MP10MI
/6-BLANK
/6-BLANKW
/6-ML10
/6-ML10I
/6-ML10MI
/6-ML10M
/6-ML10HI
/6-ML10HLine Cord Brake Options Options /ENGLAND
/GERMANY
/ISRAEL
/AUSTRALIA
/INDIA
/US-115VAC
/US-230VAC
/NOLINECORD/Brake-1
/Brake-2
/Brake-3
/Brake-4
/Brake-5
/Brake-6/ESTOP0
/ESTOP1
/EXTAMP
/SLIDE
/RS232-2Epaq
Option Description Epaq-S Six axis, desktop, stand-alone motion controller with integrated power supplies, and servo/stepping motor amplifiers. Features include independent or coordinated motion, point to point, linear and circular interpolation, constant velocity, velocity profiled, time based, free-run motion types, electronic gearing, backlash compensation, and 1D or 2D axis calibration. Ensemble Standard HMI Multi-Axis Software included. Epaq-R Six axis, rack-mount, stand-alone motion controller with integrated power supplies, and servo/stepping motor amplifiers. Features include independent or coordinated motion, point to point, linear and circular interpolation, constant velocity, velocity profiled, time based, free-run motion types, electronic gearing, backlash compensation, and 1D or 2D axis calibration. Ensemble Standard HMI Multi-Axis Software included. Standard or Blank Front Panel (must select one)
Option Description -FPB Blank front panel (without display or keypad) -FPD Standard front panel (with display and keypad) -FPBE Blank front panel with ESTOP switch (without display or keypad) -FPDE Standard front panel with ESTOP switch (with display and keypad) Line Voltage (must select one)
Option Description /A 115 VAC line voltage /B 230 VAC line voltage /C 100 VAC line voltage /D 200 VAC line voltage Bus Power Supply
Option Description 40 40 VDC motor supply, 600 W 40LP 40 VDC motor supply, 300 W 80 80 VDC motor supply, 600 W 80LP 80 VDC motor supply, 300 W 10B ±10 VDC bipolar motor supply, 400 W 20B ±20 VDC bipolar motor supply, 400 W 30B ±30 VDC bipolar motor supply, 400 W 40B ±40 VDC bipolar motor supply, 600 W Axis 1 Amplifier Options (must select one)
Option Description /1-MP10I Digital PWM amplifier, 10 A peak, 5 A continuous with I/O option /1-MP10MI Digital PWM amplifier, 10 A peak, 5 A continuous; x4096 MXU(1) with I/O option /1-ML10I Digital linear amplifier, 10 A peak, 5 A continuous with I/O option /1-ML10MI Digital linear amplifier, 10 A peak, 5 A continuous; x4096 MXU(1) with I/O option /1-ML10HI Digital linear amplifier, 10 A peak, 5 A continuous; x65536 MXH(1) with I/O option Axis 2 Amplifier Options (must select one)
Option Description /2-MP10 Digital PWM amplifier, 10 A peak, 5 A continuous /2-MP10I Digital PWM amplifier, 10 A peak, 5 A continuous with I/O option /2-MP10M Digital PWM amplifier, 10 A peak, 5 A continuous; x4096 MXU(1) /2-MP10MI Digital PWM amplifier, 10 A peak, 5 A continuous; x4096 MXU(1) with I/O option /2-BLANK No amplifier /2-BLANKW No amplifier, pre-wired only /2-ML10 Digital linear amplifier, 10 A peak, 5 A continuous /2-ML10I Digital linear amplifier, 10 A peak, 5 A continuous with I/O option /2-ML10M Digital linear amplifier, 10 A peak, 5 A continuous; x4096 MXU(1) /2-ML10MI Digital linear amplifier, 10 A peak, 5 A continuous; x4096 MXU(1) with I/O option /2-ML10H Digital linear amplifier, 10 A peak, 5 A continuous; x65536 MXH(1) /2-ML10HI Digital linear amplifier, 10 A peak, 5 A continuous; x65536 MXH(1) with I/O option Axis 3 Amplifier Options (must select one)
Option Description /3-MP10 Digital PWM amplifier, 10 A peak, 5 A continuous /3-MP10I Digital PWM amplifier, 10 A peak, 5 A continuous with I/O option /3-MP10M Digital PWM amplifier, 10 A peak, 5 A continuous; x4096 MXU(1) /3-MP10MI Digital PWM amplifier, 10 A peak, 5 A continuous; x4096 MXU(1) with I/O option /3-BLANK No amplifier /3-BLANKW No amplifier, pre-wired only /3-ML10 Digital linear amplifier, 10 A peak, 5 A continuous /3-ML10I Digital linear amplifier, 10 A peak, 5 A continuous with I/O option /3-ML10M Digital linear amplifier, 10 A peak, 5 A continuous; x4096 MXU(1) /3-ML10MI Digital linear amplifier, 10 A peak, 5 A continuous; x4096 MXU(1) with I/O option /3-ML10H Digital linear amplifier, 10 A peak, 5 A continuous; x65536 MXH(1) /3-ML10HI Digital linear amplifier, 10 A peak, 5 A continuous; x65536 MXH(1) with I/O option Axis 4 Amplifier Options (must select one)
Option Description /4-MP10 Digital PWM amplifier, 10 A peak, 5 A continuous /4-MP10I Digital PWM amplifier, 10 A peak, 5 A continuous with I/O option /4-MP10M Digital PWM amplifier, 10 A peak, 5 A continuous; x4096 MXU(1) /4-MP10MI Digital PWM amplifier, 10 A peak, 5 A continuous; x4096 MXU(1) with I/O option /4-BLANK No amplifier /4-BLANKW No amplifier, pre-wired only /4-ML10 Digital linear amplifier, 10 A peak, 5 A continuous /4-ML10I Digital linear amplifier, 10 A peak, 5 A continuous with I/O option /4-ML10M Digital linear amplifier, 10 A peak, 5 A continuous; x4096 MXU(1) /4-ML10MI Digital linear amplifier, 10 A peak, 5 A continuous; x4096 MXU(1) with I/O option /4-ML10H Digital linear amplifier, 10 A peak, 5 A continuous; x65536 MXH(1) /4-ML10HI Digital linear amplifier, 10 A peak, 5 A continuous; x65536 MXH(1) with I/O option Axis 5 Amplifier Options (must select one)
Option Description /5-MP10 Digital PWM amplifier, 10 A peak, 5 A continuous /5-MP10I Digital PWM amplifier, 10 A peak, 5 A continuous with I/O option /5-MP10M Digital PWM amplifier, 10 A peak, 5 A continuous; x4096 MXU(1) /5-MP10MI Digital PWM amplifier, 10 A peak, 5 A continuous; x4096 MXU(1) with I/O option /5-BLANK No amplifier /5-BLANKW No amplifier, pre-wired only /5-ML10 Digital linear amplifier, 10 A peak, 5 A continuous /5-ML10I Digital linear amplifier, 10 A peak, 5 A continuous with I/O option /5-ML10M Digital linear amplifier, 10 A peak, 5 A continuous; x4096 MXU(1) /5-ML10MI Digital linear amplifier, 10 A peak, 5 A continuous; x4096 MXU(1) with I/O option /5-ML10H Digital linear amplifier, 10 A peak, 5 A continuous; x65536 MXH(1) /5-ML10HI Digital linear amplifier, 10 A peak, 5 A continuous; x65536 MXH(1) with I/O option Axis 6 Amplifier Options (must select one)
Option Description /6-MP10 Digital PWM amplifier, 10 A peak, 5 A continuous /6-MP10I Digital PWM amplifier, 10 A peak, 5 A continuous with I/O option /6-MP10M Digital PWM amplifier, 10 A peak, 5 A continuous; x4096 MXU(1) /6-MP10MI Digital PWM amplifier, 10 A peak, 5 A continuous; x4096 MXU(1) with I/O option /6-BLANK No amplifier /6‑BLANKW No amplifier, pre-wired only /6-ML10 Digital linear amplifier, 10 A peak, 5 A continuous /6-ML10I Digital linear amplifier, 10 A peak, 5 A continuous with I/O option /6-ML10M Digital linear amplifier, 10 A peak, 5 A continuous; x4096 MXU(1) /6-ML10MI Digital linear amplifier, 10 A peak, 5 A continuous; x4096 MXU(1) with I/O option /6-ML10H Digital linear amplifier, 10 A peak, 5 A continuous; x65536 MXH(1) /6-ML10HI Digital linear amplifier, 10 A peak, 5 A continuous; x65536 MXH(1) with I/O option Line Cord (must select one)
Option Description /ENGLAND UK compatible line cord /GERMANY German compatible line cord /ISRAEL Israel compatible line cord /INDIA India compatible line cord /AUSTRALIA Australia compatible line cord /US-115VAC US 115 VAC line cord /US-230VAC US 230 VAC line cord /NO-LINECORD No line cord Brake Options (up to 2 selections allowable)
Option Description /BRAKE-1 Axis 1 wired for 24 V, 1 A brake /BRAKE-2 Axis 2 wired for 24 V, 1 A brake (amp must have “I” or “MI” option) /BRAKE-3 Axis 2 wired for 24 V, 1 A brake (amp must have “I” or “MI” option) /BRAKE-4 Axis 2 wired for 24 V, 1 A brake (amp must have “I” or “MI” option) /BRAKE-5 Axis 2 wired for 24 V, 1 A brake (amp must have “I” or “MI” option) /BRAKE-6 Axis 2 wired for 24 V, 1 A brake (amp must have “I” or “MI” option) Options (multiple selections allowable)
Option Description /ESTOP0 Provides user with a mushroom switch on front panel to stop motion, disable, and disconnect AC to motor power supply; requires -FPDE or -FPBE options /ESTOP1 Controller stops motion, then disables servo control; internal positive guided relay with monitor contact disconnects AC power source from motor; operator risk assessment is the responsibility of the end user or integrator; not compatible with -FPBE or FPDE; user must provide external ESTOP switch and wiring to the Epaq /EXTAMP External amplifier interface connector /SLIDE Rack-mount slides to be used with Epaq-R /RS232-2 Second RS-232 interface port Standard Motor Power and Combination Power/Feedback Cables (order as separate line items)
Option Description C21481-50 CABLE: BL MTR-4TS-4MS-LP1-MAX450DM: MS motor power cable; Epaq 4-terminal connector to 4-pin MS connector; 5 A continuous current; 5 meters long C21491-50 CABLE: BL MTR-4TS-4DU-LP1-MAX450DM: HPD motor power cable; Epaq 4-terminal connector to 4-pin high power D connector; 5 A continuous current; 5 meters long C21511-50 CABLE: BL MTR-4TS-4DU-LP1-HF-MAX450DM: Hi Flex HPD motor power cable; Epaq 4 terminal connector to 4-pin High Power D connector; 5 A continuous current; 5 meters long C21501-50 CABLE: BL MTR & FB-4TS-25DU-25DU-MAX107DM: 25-pin D stage to split Epaq 4-terminal strip motor power and 25D feedback cable; 5 meters long C21521-50 CABLE: SM MTR & FB-25DU-4TS-23B-MAX107DM: 23-pin stepper motor connector to split Epaq 4-terminal strip motor power and 25D feedback cable; 5 meters long C22091-50 Motor power cable, high flex, 5.0 meters long, for use with Epaq; 4 A continuous current rating, to be used with 10 A peak drives ONLY Accessories
Option Description /JBV Joystick with 5 ft cable /JI Industrial joystick with 5 ft cable Integration (Required)
Option Description -TAS Integration - Test as system
Testing, integration, and documentation of a group of components as a complete system that will be used together (ex: drive, controller, and stage). This includes parameter file generation, system tuning, and documentation of the system configuration.-TAC Integration - Test as components
Testing and integration of individual items as discrete components that ship together. This is typically used for spare parts, replacement parts, or items that will not be used together. These components may or may not be part of a larger system.