AMCI NXEE2 User manual

MICRO CONTROLS INC.
ADVANCED
U
s
e
r
M
a
n
u
a
l
NXEE2
mini-NEXUS
SSI Interface Module
with Integral 2-Port Ethernet Switch
Device Level Ring functionality for EtherNet/IP
Media Redundancy Protocol for PROFINET
Manual #: 940-0N110
E2 Technology

ADVANCED MICRO CONTROLS INC.
GENERAL INFORMATION
Important User Information
The products and application data described in this manual are useful in a wide variety of different applica-
tions. Therefore, the user and others responsible for applying these products described herein are responsible
for determining the acceptability for each application. While efforts have been made to provide accurate infor-
mation within this manual, AMCI assumes no responsibility for the application or the completeness of the
information contained herein.
UNDER NO CIRCUMSTANCES WILL ADVANCED MICRO CONTROLS, INC. BE RESPONSIBLE OR
LIABLE FOR ANY DAMAGES OR LOSSES, INCLUDING INDIRECT OR CONSEQUENTIAL DAM-
AGES OR LOSSES, ARISING FROM THE USE OF ANY INFORMATION CONTAINED WITHIN THIS
MANUAL, OR THE USE OF ANY PRODUCTS OR SERVICES REFERENCED HEREIN.
No patent liability is assumed by AMCI, with respect to use of information, circuits, equipment, or software
described in this manual.
The information contained within this manual is subject to change without notice.
This manual is copyright 2021 by Advanced Micro Controls Inc. You may reproduce this manual, in whole or
in part, for your personal use, provided that this copyright notice is included. You may distribute copies of this
complete manual in electronic format provided that they are unaltered from the version posted by Advanced
Micro Controls Inc. on our official website: www.amci.com. You may incorporate portions of this documents
in other literature for your own personal use provided that you include the notice “Portions of this document
copyright 2021 by Advanced Micro Controls Inc.” You may not alter the contents of this document or charge a
fee for reproducing or distributing it.
Standard Warranty
ADVANCED MICRO CONTROLS, INC. warrants that all equipment manufactured by it will be free from
defects, under normal use, in materials and workmanship for a period of [18] months. Within this warranty
period, AMCI shall, at its option, repair or replace, free of charge, any equipment covered by this warranty
which is returned, shipping charges prepaid, within eighteen months from date of invoice, and which upon
examination proves to be defective in material or workmanship and not caused by accident, misuse, neglect,
alteration, improper installation or improper testing.
The provisions of the "STANDARD WARRANTY" are the sole obligations of AMCI and excludes all other
warranties expressed or implied. In no event shall AMCI be liable for incidental or consequential damages or
for delay in performance of this warranty.
Returns Policy
All equipment being returned to AMCI for repair or replacement, regardless of warranty status, must have a
Return Merchandise Authorization number issued by AMCI. Call [phone] with the model number and
serial number (if applicable) along with a description of the problem during regular business hours, Monday
through Friday, 8AM - 5PM Eastern. An "RMA" number will be issued. Equipment must be shipped to AMCI
with transportation charges prepaid. Title and risk of loss or damage remains with the customer until shipment
is received by AMCI.
24 Hour Technical Support Number
24 Hour technical support is available on this product. If you have internet access, start at www.amci.com.
Product documentation and FAQ’s are available on the site that answer most common questions.
If you require additional technical support, call [phone]. Your call will be answered by the factory dur-
ing regular business hours, Monday through Friday, 8AM - 5PM Eastern. During non-business hours an auto-
mated system will ask you to enter the telephone number you can be reached at. Please remember to include
your area code. The system will page an engineer on call. Please have your product model number and a
description of the problem ready before you call.
Waste Electrical and Electronic Equipment (WEEE)
At the end of life, this equipment should be collected separately from any unsorted municipal waste.

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TABLE OF CONTENTS
GENERAL INFORMATION
Important User Information ..................... 2
Standard Warranty ................................... 2
Returns Policy .......................................... 2
24 Hour Technical Support Number ........ 2
WEEE Statement ..................................... 2
About this Manual
Audience .................................................. 5
Trademark Notices ................................... 5
Revision Record ....................................... 5
Revision History ............................ 5
Navigating this Manual ............................ 5
Manual Conventions ................................ 5
Where To Go From Here ......................... 6
Reference: Introduction to the
NXEE2
The NXEE2 .............................................. 7
SSI protocol ............................................. 8
NXEE2 Programmable Parameters ......... 9
Data Setup Parameters ................... 10
Channel Setup Parameters ............. 12
Programming Cycle ................................. 13
Status LED’s ............................................ 14
Module Status (MS) LED .............. 14
Network Status (NS) LED ............. 14
Power Connectors .................................... 15
NXEE2 Power ............................... 15
Sensor Power ................................. 15
Ethernet Connectors ................................. 15
I/O Connector .......................................... 15
Specifications ........................................... 16
................................................................. 16
Reference: Data Formats
Network Output Data ............................... 17
Command Word Format ................ 17
Configuration Word Format .......... 18
Error Response ......................................... 19
Network Input Data .................................. 20
Status Word Format ...................... 20
Reference: Configuring Network 
Interfaces
Firewall Settings ....................................... 23
Disable All Unused Network Interfaces .. 23
Configure Your Network Interface .......... 23
Test Your Network Interface ................... 24
Task 1: Installing the NXEE2
Safe Handling Guidelines ........................ 25
Prevent Electrostatic Damage ....... 25
Prevent Debris From 
Entering the Module ................... 25
Remove Power Before Servicing .. 25
Mounting .................................................. 25
DIN Rail Installation ..................... 25
Dimensions ................................... 26
Mounting the NXEE2 Module ...... 26
Power Wiring ........................................... 27
Network Connections ............................... 27
EtherNet/IP DLR Applications ..... 27
PROFINET MRP Applications .... 27
I/O Connector Pin Out ............................. 28
SSI Transducer Wiring ............................. 28
AMCI DC25 SSI 
DuraCoder Wiring ...................... 29
Extending the Sensor Cable .......... 29
Avoiding Ground Loops ............... 30
Powering the SSI Sensor .......................... 30
Actual SSI Data is all 1’s .............. 30
Input Wiring ............................................. 31
Cable Shields ................................ 31
Task 2: Set the IP Address and 
Protocol
Determine the Best Method for 
Setting the IP Address ............................ 33
Use Factory Default Settings ................... 33
Use the Embedded Web Server ................ 34
Use the AMCI NET 
Configurator Utility ................................ 36

Table of Contents
ADVANCED MICRO CONTROLS INC.
4
EtherNet/IP Task: 
Implicit Communications
with an EDS
Obtain the EDS file .................................. 43
Install the EDS file ................................... 43
Start the EDS Hardware 
Installation Tool .......................... 43
Install the EDS File ....................... 44
Host System Configuration ...................... 46
Add the NXEE2 to Your Project .............. 46
NXEE2 Properties .................................... 47
General Tab ................................... 47
Connection Tab ............................. 47
Configuration Tab ......................... 48
Buffering the Input Data .......................... 48
EtherNet/IP Task: 
Implicit Communications 
Without an EDS
Host System Configuration ...................... 49
Add the NXEE2 ....................................... 49
Check for Communication Errors ............ 52
Configure the NXEE2 .............................. 52
Buffer I/O Data ......................................... 53
EtherNet/IP Task: EtherNet/IP 
Explicit Messaging
Required Message Instructions ................ 55
Create Four New Data Files. .................... 55
Add the Message Instructions 
to your Ladder Logic .............................. 56
Troubleshooting ....................................... 59
Modbus Task: Modbus TCP 
Configuration
Enable Modbus TCP Protocol .................. 61
Modbus Addressing .................................. 61
Modbus Table Mapping ................ 61
Host Addressing ............................ 61
AMCI Modbus TCP Memory Layout ...... 62
Supported Number of Connections .......... 62
Supported Modbus Functions ................... 63
Supported Modbus Exceptions ................. 63
PROFINET Task: PROFINET Network
Configuration
Basic Steps ................................................ 65
Download the GSDML files ..................... 65
GSDML File Installation .......................... 65
Configure the PROFINET Network ......... 65
Add the NXEE2 to the PROFINET 
Network .................................................. 66
Configure the NXEE2 .............................. 68
Set the I/O Configuration ......................... 69
Set the NXEE2 Device Name ................... 70
Verify and Download the New 
Configuration .......................................... 70
MRP Installations ..................................... 71
Configure the NXEE2 as an MRC ........... 71

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ABOUT THIS MANUAL
Audience
This manual explains the set-up, installation, and operation of AMCI’s NXEE2 SSI Interface Module. It is
written for the engineer responsible for incorporating these modules into a design, as well as the engineer or
technician responsible for their actual installation.
Trademark Notices
The AMCI logo is a trademark of Advanced Micro Controls Inc. “CIP” is a trademark of Open DeviceNet
Vendor Association, Inc. “EtherNet/IP” is a trademark of ControlNet International, Ltd. under license by
Open DeviceNet Vendor Association, Inc. “PROFINET” is a registered trademark of PROFIBUS & PROFI-
NET International (PI). “Adobe” and “Acrobat” are registered trademarks of Adobe Systems Incorporated.
All other trademarks contained herein are the property of their respective holders.
Revision Record
This manual, 940-0N110, is the first release of this manual. It was released May 14th, 2021.
Revision History
940-0N110 May14, 2021: Initial release.
Navigating this Manual
This manual is designed to be used in both printed and on-line formats. Its on-line form is a PDF document,
which requires Adobe Acrobat Reader version 7.0+ to open it. The manual is laid out with an even number of
pages in each chapter. This makes it easier to print a chapter to a duplex (double sided) printer.
The PDF file is password protected to prevent changes to the document. You are allowed to select and copy
sections for use in other documents and, if you own Adobe Acrobat version 7.0 or later, you are allowed to
add notes and annotations.
Manual Conventions
Three icons are used to highlight important information in the manual:
NOTES highlight important concepts, decisions you must make, or the implications of those
decisions.
CAUTIONS tell you when equipment may be damaged if the procedure is not followed
properly.
WARNINGS tell you when people may be hurt or equipment may be damaged if the pro-
cedure is not followed properly.
Read this chapter to learn how to navigate through this manual and familiarize
yourself with the conventions used in it. The last section of this chapter highlights
the manual’s remaining chapters and their target audiences.

ABOUT THIS MANUAL NXEE2 User Manual
ADVANCED MICRO CONTROLS INC.
6
Manual Conventions (continued)
The following table shows the text formatting conventions:
Where To Go From Here
You will most likely read this manual for one of two reasons:
If you are curious about the NXEE2 SSI Interface Module from AMCI, this manual contains the infor-
mation you need to determine if these product is the right one for your application. The first chapter,
Introduction to the NXEE2, contains all of the information you will need to fully specify the right
product for your application.
If you need to install and use the NXEE2 SSI Interface Module, then the rest of the manual is written for
you. To simplify installation and configuration, the rest of the manual is broken down into references
and tasks. Using this product requires you to complete multiple tasks, and the manual is broken down
into sections that explain how to complete each one.
Format Description
Normal Font Font used throughout this manual.
Emphasis Font Font used the first time a new term is introduced.
Cross Reference When viewing the PDF version of the manual, clicking on
the cross reference text jumps you to referenced section.
HTML Link When viewing the PDF version of the manual, clicking on
the link will connect you with the www.amci.com website.
Chapter Title Page # Intended Audience
Introduction to the
NXEE2 7Anyone new to the NXEE2. This chapter gives a basic overview of
the features available on the unit, typical applications, and specifi-
cations.
Data Formats 17 Anyone that needs detailed information on the data formats used by
the NXEE2 to communicate with its host controller.
Configuring Network
Interfaces 23 Basic information on configuring a PC or laptop to successfully
communicate with an NXEE2 to set its IP address.
Installing the
NXEE2 25 Anyone that must install an NXEE2 on a machine. Includes infor- mation on mounting, grounding, and wiring specific to the units.
Set the IP Address
and Protocol 33 Anyone that needs to change the IP address or communications  protocol used by the NXEE2.
Implicit
Communicationswith
an EDS 43 Anyone that wants to use EtherNet/IP Implicit Messaging on 
platforms that support EDS files.
Implicit
Communications
Without an EDS 49 Anyone that wants to use EtherNet/IP Implicit Messaging on 
platforms that do not support EDS files.
EtherNet/IP Explicit
Messaging 55 Anyone using EtherNet/IP Explicit Messaging to communicate
with the NXEE2.
Modbus TCP
Configuration 61 Anyone using Modbus TCP to communicate with the NXEE2.
PROFINET Network
Configuration 65 Anyone using PROFINET to communicate with the NXEE2.

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REFERENCE 1
INTRODUCTION TO THE NXEE2
The NXEE2
The NXEE2 is a two channel SSI interface module that accepts 24 to 48 Vdc as its power source. Synchro-
nous Serial Interface (SSI) is an industry standard serial protocol for transmitting sensor data. The SSI proto-
col is most commonly used in rotary and linear distance sensors, but any type of data can be transmitted using
the protocol.
The NXEE2 is a two channel SSI interface module that allows you to lower transducer wiring cost by placing
the NXEE2 close to the transducers and running a single network cable back to the host controller. The
NXEE2 also future-proofs your SSI feedback design. The host controller can be updated to any future plat-
form that supports EtherNet/IP, PROFINET, or Modbus TCP and the NXEE2 will operate with the new sys-
tem.
E2 Technology
The NXEE2 is a member of the growing line of products from AMCI that incorporate our E2 Technology. E2
Technology by AMCI is an innovative new multi-protocol approach to Ethernet distributed I/O.
E2 Technology products are simple and intuitive, allowing easy transition between Ethernet/IP, PROFINET,
or Modbus/TCP protocols without the need to physically switch parts. An advanced web server integrated
into all AMCI E2 Technology devices facilitates simple network configuration and troubleshooting via a
web-browser. Furthermore, an impressive array of advanced features for each supported protocol has been
incorporated into the devices to meet many unique application requirements.
Each unit has two Ethernet ports which are internally connected through an onboard, two port, 10/100 Mbps
ethernet switch. These ports allow you to wire your network in a “daisy-chain” fashion, which may lower net-
work wiring costs and complexities.
The two ports also allow the units to function as members of a redundant Device Level Ring (DLR) network
when using the EtherNet/IP protocol or as clients in a Media Redundancy Protocol (MRP) network when
using PROFINET.
In DLR environments, the units act as Beacon-Based Ring Nodes. All units can process beacon packets at the
default rate of every 400 microseconds. Beacon-based nodes can respond faster to network changes than
nodes that only process Announce packets.
SSI Sensor Interface
The NXEE2 contains several parameters that allows the module to interface with any SSI sensor on the mar-
ket today and extract the data value from it. A total of four values are available. These four values are:
Data Value (Typically a position value.)
Rate of Change (The velocity value when the Data Value represents a position.)
Actual SSI Value (The data stream read from the SSI sensor. This stream will include any available 
status bits.)
Captured Data Value (Captures and reports the Data Value when an input makes a transition. The
NXEE2 sets a status bit to signal that a new value is available. This bit must be reset by a write to the
NXEE2 from the host controller before another capture can occur.)
Any two of these values can be reported to the host controller at a time. The two that are reported is program-
mable from the host controller.
Each channel has a dedicated DC input. As mentioned above, the input can be programmed to capture the
Data Value on a transition. The input can also be programmed for a different function. The input can be pro-
grammed to preset the Data Value on a transition. The Preset Value is programmable from the host controller.
This reference section contains the information you need to decide if the NXEE2
SSI Interface Module is the right product for your application.

INTRODUCTION TO THE NXEE2 NXEE2 User Manual
ADVANCED MICRO CONTROLS INC.
8
The NXEE2 (continued)
SSI Sensor Interface
Communication is performed through input registers and output registers assigned to the module. The
NXEE2 can be completely configured from your host controller. This allows you to:
Configure the NXEE2 to work with all popular SSI sensors.
Scale the Data Value to engineering units.
Read status bits from the SSI sensor.
Preset the Data Value when aligning the machine.
Copy setup data from one machine to another
Design custom HMI interfaces for configuration and alignment that can simplify machine training,
startup, and repair.
SSI protocol
The original SSI protocol specification defined a twenty-five bit serial data stream from the sensor that is syn-
chronized to clock pulses generated by a controller such as the NXEE2. The protocol defines minimum and
maximum clock frequencies. (The sensor cable dictates the maximum allowable frequency for each applica-
tion.) In addition to the clock frequency, the SSI protocol specifies signal timing and electrical characteristics.
However, the protocol does not specify the content, or format, of the data bits.
Since its introduction, several companies have chosen not to follow the twenty-five bit convention of the SSI
protocol. For example, single turn rotary encoders typically use a thirteen bit transfer. Figure R1.1 below
shows a typical SSI data transfer.
Figure R1.1 SSI Transfer
Sensor data is latched on the first falling clock edge.
The most significant data bit is shifted out on first rising edge. Subsequent rising clock edges shift out the
rest of the data.
TINT is the total interogation time for the sensor. It is equal to t* N+ 0.5twhere t= 1/(SSI clock fre-
quency) and Nequals the number of data bits in the SSI stream.
TMis the time that the last bit is valid, which is determined by the sensor. It is typically 12 to 20 microsec-
onds. It must be at least 5 microseconds to be compatible with the NXEE2. Also note that the diagram
shows the last bit as data. The original SSI protocol specification defined this bit as a stop bit which is
always low. AMCI is aware of several manufacturers that are using this bit position for data, so the NXEE2
treats it as such.
TIDL is the time between interogations and is controlled by the NXEE2. The NXEE2 guarentees a mini-
mum of 800 microseconds between interogations. Your SSI sensor must have new data available within
this time.
Multi-word transfers are accomplished by holding the clock signal low for the TMtime period
and restarting the clock. This signals the transducer to transfer additional bits of data instead of
restarting at bit 1. Because multi-word transfers are rarely used in applications, the NXEE2
does not support this protocol.
Bit 1
123 N-2N-1N
MSB LS
B
Bit 1
Bit 2
Bit 2
Bit 3
Bit (N-2) Bit (N-1)
Bit (N)
T
M
T IDL
= 800µS min.
T INT
t t = 1/ 
SSI





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NXEE2 User Manual INTRODUCTION TO THE NXEE2
9
NXEE2 Programmable Parameters
The NXEE2 is configured by setting its Programmable Parameters. Each channel of the NXEE2 has its own
set of parameters, which allows the NXEE2 to interface with two completely different SSI sensors. These
parameters are broken down into three groups.
SSI Setup Parameters – Six parameters that are used to extract the Data Value from the SSI bit stream. These
parameters define the SSI clock speed, number of bits in the SSI stream, the position and length of
the Data Value within the stream, and the format of the data.
Data Setup Parameters – Six parameters that affect the Data Value and Velocity information. These parame-
ters allow you to scale the Data Value, preset it to a programmable count, change the direction of
increasing counts, set its rollover position in rotary applications, and set the update time of the Veloc-
ity information.
Channel Setup Parameters – Three parameters that are used to enable or disable the channel’s LED, define
the function of the channel’s discrete DC input, and define the data that is transmitted to the host con-
troller.
SSI Setup Parameters
SSI Clock Frequency
This parameter allows you to set the SSI clock frequency to one of four values: 125 kHz, 250 kHz, 500 kHz
or 1 MHz. The default frequency of 125KHz allows for the greatest sensor cable length. Increasing the fre-
quency will not decrease the network transfer time to your host controller. The frequency should only be
increased if your sensor cannot operate at 125KHz.
Number of SSI Data Bits
This parameter sets the number of bits in the entire SSI data transfer. This parameter has a range of one to
thirty-two. Its default value is twenty-four.
MSB Number & Number of Data Value Bits Parameters
As the examples show in figure R1.2, these two parameters tell the NXEE2 where the Data Value is embed-
ded in the SSI data stream. The MSB Number parameter specifies the location of the first bit of the Data
Value in the SSI data stream. The Number of Data Value Bits parameter specifies the length of the Data
Value. The default value of the MSB Number parameter is one. The default value for the Number of Data
Value Bits parameter is twenty-four. The default values will work with AMCI multi-turn SSI DuraCoders as
well as many other multi-turn rotary SSI encoders and linear sensors.
Figure R1.2 Data Value in SSI Data Stream Examples
SSI DATA BITS
MSB Number = 2
Number of Data Value Bits = 12
Format used by AMCI SSI
single turn DuraCoders
SSI DATA BITS
MSB Number = 6
Number of Data Value Bits = 16
MSB Number = 1
Number of Data Value Bits = 24
Format used by AMCI SSI multi-turn DuraCoders

INTRODUCTION TO THE NXEE2 NXEE2 User Manual
ADVANCED MICRO CONTROLS INC.
10
NXEE2 Programmable Parameters (continued)
SSI Setup Parameters (continued)
Data Type
This parameter tells the NXEE2 to interpret the data from the SSI sensor as a binary number or as a gray code
encoded number. The default is Binary.
Data Logic
This parameter is included to handle rare situations where the Data Value is reported with negative logic. If
this parameter is set, the NXEE2 will invert the data bits before performing any scaling. The default value is
Positive, which means that the NXEE2 will not invert the Data Value bits from the sensor.
Data Setup Parameters
These six parameters affect the Data Value and Velocity information. These parameters allow you to scale the
Data Value, preset it to a programmable count, change the direction of increasing counts, set its rollover posi-
tion in rotary applications, and set the update time of the Velocity information.
Full Scale Count
The Full Scale Count parameter is important only if you are using a rotary encoder. If you have a linear
device, such as a magneto-restrictive linear displacement sensor or a laser range finder, leave this parameter
at its default value of zero.
If you are using a rotary encoder, the Full Scale Count parameter sets the number of counts the NXEE2 can
expect before the position rolls over to zero. If this value is not set, or set incorrectly, the NXEE2 will not be
able to handle the roll over between the maximum value and zero correctly.
The Full Scale Count parameter must be set to the total number of counts generated by the encoder. For exam-
ple, the single turn SSI DuraCoder from AMCI is a twelve bit encoder by default. For this encoder, the Full
Scale Count should be set to 212 = 4,096. For multi-turn encoders, the Full Scale Count parameter should be
set to (the number of counts per turn) * (the total number of turns). For example, the multi-turn SSI Dura-
Coder from AMCI defaults to 4,096 counts per turn and 4,096 turns. In this example, the Full Scale Count
should be set to 4,096 * 4,096 = 16,777,216.
The SSI DuraCoders from AMCI are fully programmable with a software utility available on
our website. While programming, you set the DuraCoder’s Full Scale Count parameter. When
configuring the NXEE2, make sure that the NXEE2’s Full Scale Count parameter matches the
DuraCoder’s Full Scale Count parameter.
Count Direction
The Count Direction parameter allows you to reverse the direction of travel needed to increase the Data
Value. For simplicity’s sake, the two values for this parameter are called Positive and Negative. When this
parameter is set to its default of Positive, the Data Value is not changed. When this parameter is set to Nega-
tive, the change in Data Value depends on the value of the Full Scale Count parameter.
If the Full Scale Count parameter equals zero, a linear sensor is assumed and the Data Value is changed to
(2n– (Data Value)), where ‘n’ is the value of the Number of Data Value Bits parameter.
If the Full Scale Count parameter is non-zero, a rotary sensor is assumed. The Data Value is change to
((Full Scale Count - Data Value) MOD Full Scale Count). The modulus function is required to keep the zero
position as zero.
Changing this parameter will most likely change the Data Value reported by the NXEE2. The
only time this does not occur is if you are using a rotary encoder and the position is at zero
when you reverse the count direction. Because of this, set the Count Direction parameter
before you preset the Data Value.

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NXEE2 User Manual INTRODUCTION TO THE NXEE2
11
NXEE2 Programmable Parameters (continued)
Data Setup Parameters (continued)
Scalar Multiplier and Scalar Divisor
These two parameters are used to scale the Data Value before it is transmitted to the host controller. Both
parameters have a default value of one and can range in value from 1 to 32,767. The Scalar Multiplier must be
less than or equal to the Scalar Divisor. In other words, the ratio of Multiplier to Divisor cannot be greater
than one.
The first example of their use is with linear displacement transducers (LDT’s), such as the ones available
from Balluff and MTS. Each of these manufacturers have resolutions measured in µm/count. The NXEE2 can
easily convert these measurements to the US customary system of inches. Figure R1.3 below shows the Mul-
tiplier and Divisor values needed to convert from various metric resolutions to US customary resolutions. For
example, to convert data from a LDT with 5µm/count resolution to 0.0005"/count resolution, use a Scalar
Multiplier of 50 and a Scalar Divisor of 127.
Figure R1.3 Common LDT Scalar Values
Use the following procedure to calculate your Scalar Multiplier and Divisor values if either your LDT Reso-
lution or Desired Resolution does not appear in the above table.
1) Convert your LDT resolution from µm to inches. For example, you are using a sensor with 1 µm
resolution in your application.
2) Determine the number of counts per inch for the desired resolution. For example, 0.0001".
3) Determine the Scalar Multiplier and Divisor values.
Therefore, to use a sensor with 1 µm resolution and get 0.0001 inches per count resolution, use a Scalar Mul-
tiplier of 50 and a Scalar Divisor of 127.
0.0002"0.0001"0.00005"
5 µm
10 µm
1 µm
20 µm
2 µm
40 µm
0.0005" 0.001" 0.002" 0.005"
125
127
50
127
100
127
25
127
50
127
100
127
50
127
20
127
10
127
100
127
25
127
10
127
5
127
50
127
100
127
25
254
5
254
5
254
25
127
50
254
100
127
5
127
2
127
1
127
10
127
20
127
40
127
Desired resolution
exceeds resolution
of LDT.
=
Desired Resolution
LDT Resolution
Conversion Factor Desired Resolution (counts/inch)
LDT Resolution (counts/inch)
-------------------------------------------------------------------------------=
1µm 1mm
1000µm
--------------------
1 inch
25.4 mm
---------------------
0.00003937 inches/count = 25,400 counts/inch=
0.0001 inches/count 10,000 counts/inch=
Desired Resolution (counts/inch)
LDT Resolution (counts/inch)
-------------------------------------------------------------------------------10,000 counts/inch
25,400 counts/inch
--------------------------------------------- 100
254
---------50
127
---------===

INTRODUCTION TO THE NXEE2 NXEE2 User Manual
ADVANCED MICRO CONTROLS INC.
12
NXEE2 Programmable Parameters (continued)
Data Setup Parameters (continued)
Preset Value
The Preset Value parameter gives you the ability to offset the Data Value. When you preset the Data Value,
the NXEE2 calculates an internal offset. The internal offset is the value needed to make the Data Value equal
to the Preset Value. The default Preset Value is zero. Its range depends on the value of the Full Scale Count
Parameter
If the Full Scale Count is zero, the range of the Preset Value is ±268,435,455
If the Full Scale Count is not zero, the range of the Preset Value is 0 to (Full Scale Count – 1)
The type of internal offset that is generated when you preset the Data Value is also affected by the value of the
Full Scale Count.
If the Full Scale Count is zero, the internal offset is a linear offset. The range of values that you will see
in the Data Value will be shifted by the amount of the internal offset. For example, without a preset
applied, the Data Value ranges from 0 to 100. If you are at position zero, and apply a Preset Value of
1,000, the Data Value will now range from 1,000 to 1,100.
If the Full Scale Count is not zero, the internal offset is a circular offset. This offset shifts the zero point
of the Data Value. It does not change the range of values that you will see from the Data Value.
Programming this parameter does not change the Data Value. There is a separate command for
presetting the Data Value to the Preset Value. This command uses the Apply Preset to Data
Value bit in the Network Output Data as described in reference chapter 2starting on page 17.
Velocity Update Time
Velocity data, which is the rate of change in the Data Value, is always reported to the network host in terms of
counts per second. It is based on the scaled Data Value, not the value extracted from the SSI data stream. The
Velocity Update Time parameter allows you to choose between 24 and 160 milliseconds between updates,
with a default of 160 milliseconds. The 160 millisecond setting give you a better velocity average, while the
24 millisecond setting give you a faster response to accelerations. This parameter has no effect on the Data
Value itself. Specifically, it does not alter how often the Data Value is updated in the Network Input Data.
Channel Setup Parameters
Turn Off Channel LED
This parameter allows you to disable the channel’s status LED. This is most commonly done if the channel is
unused. Network Input Data for the channel is unaffected, so it is possible to disable the channel’s status LED
once it is configured and operating. The NXEE2 ships from the factory with the channel 2 LED disabled.
Channel Input Function
This parameter allow you to choose the functionality of the channel’s discrete DC input. Your choices are:
General Purpose Input. Its state is reported in the Network Input Data. The data bit is on when the
input is receiving power.
Apply Preset to Data Value. The Data Value is set equal to the programmed Preset Value. This can be
programmed to occur on the rising edge of the input, the falling edge, or both edges. The calculated off-
set is stored in RAM and is lost when power is cycled to the NXEE2.
Capture Data Value. The Data Value can be captured and can be reported in the Network Input Data.
This can be programmed to occur on the rising edge of the input, the falling edge, or both edges.

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NXEE2 User Manual INTRODUCTION TO THE NXEE2
13
NXEE2 Programmable Parameters (continued)
Channel Setup Parameters (continued)
Network Input Data Format
The following values can be transmitted to the host controller in the Network Input Data:
Data Value
Velocity
Captured Data Value
Actual SSI Data
There are only five data words available to each channel. Therefore the NXEE2 can only transmit two values
at a time. The Network Input Data Format parameter allows you to choose which values are transmitted.
The NXEE2 can take up to four milliseconds to accept a change in format and begin transmit-
ting the newly selected values. If your network interface updates the Network Input Data at a
rate faster than four milliseconds, it may take multiple reads before the change in selected val-
ues is seen.
Programming Cycle
New parameter values are written to the NXEE2 through a Programming Cycle. A Programming Cycle con-
sists of six steps and is controlled by the Transmit Bit in the Network Output Data and the Acknowledge Bit
in the Network Input Data.
1) Write the new programming data into the registers assigned to the module with the Transmit Bit
reset. This step insures that the correct data is in the registers before the Programming Cycle begins.
2) Set the Transmit bit. A Programming Cycle is initiated when this bit makes a 01 transition.
3) Once the NXEE2 is done with the programming data, it will set any necessary error bits and the
Acknowledge Bit in the Network Input Data.
4) Once you see the Acknowledge Bit set, check for any errors. The error bits are guaranteed valid
while the Acknowledge Bit is set.
5) Respond to any errors and reset the Transmit Bit.
6) The NXEE2 responds by resetting the Acknowledge Bit. The Programming Cycle is now complete.
All parameters are checked before any of them are applied. If there is an error in the block of
data, the NXEE2 will only set the appropriate error bits in the Network Input Data. Parameters
are not applied to the NXEE2 until all of the data is correct.

INTRODUCTION TO THE NXEE2 NXEE2 User Manual
ADVANCED MICRO CONTROLS INC.
14
Status LED’s
Module Status (MS) LED
The Module Status LED is a bi-color red/green LED. The state of the LED depends on the state of the net-
work adapter module.
Table R1.1 Module Status LED States
Network Status (NS) LED
The Network Status LED is a bi-color red/green LED. The state of the LED depends on the protocol the
NXEE2 is configured to for.
Table R1.2 Network Status LED States
LED State EtherNet/IP Definition Modbus TCP Definition PROFINET Definition
Off No Power
Alternating
Red/Green Power up Self-Test (Occurs very quickly on power up.)
Flashing
Green Waiting for valid physical connection to the network. Not Implemented
Steady Green Drive and Network are operational. Device Name or IP Address
are set.
Flashing Red
Initializing: IP Address Conflict Initializing: Device Name or
IP Address are not set.
If the Network Status LED is also flashing red, the IP Address or Network Protocol has
been changed. Cycle power to the unit to continue. If the Network Status LED is in any
other state, a write to flash memory has failed. Cycle power to the unit to clear this fault.
Steady Red Major Fault. Cycle power to the unit to attempt to clear the fault.
LED State EtherNet/IP Definition Modbus TCP Definition PROFINET Definition
Off No Power No power or no TCP 
connections
No power, duplicate IP
address, mismatch in Device
Name, or no connection to the
IO Controller.
Alternating
Red/Green Power up Self-Test (Occurs very quickly when power is applied.)
Flashing
Green Ethernet connection, but no CIP connections
Indicates number of 
connections with 2 second
delay between group. The
NXEE2 supports up to 5
concurrent connections.
On-line, Stop state. 
A connection with the IO 
Controller is established and 
it is in its STOP state.
Steady Green Valid Ethernet network
and CIP connections Not Implemented On-line, Run state. 
A connection with the IO 
Controller is established and 
it is in its RUN state.
Blinking Red
If the MS LED is steady
green: Network 
Connection Timeout Not Implemented Not Implemented
If the MS LED is blinking red: IP Address or Network Protocol changed: Cycle power
Steady Red Duplicate IP address on network. Not Implemented.

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NXEE2 User Manual INTRODUCTION TO THE NXEE2
15
Power Connectors
NXEE2 Power
Power connections for the NXEE2 are made through a plug in connector on the bottom of the module. This
connector also has a pin for attaching the module to chassis ground. Detailed information on NXEE2 power
wiring can be found in the Power Wiring section of the installation chapter, starting on page 27. The mate to
this connector is included with the NXEE2. Spares are available from AMCI under the part number MS-4M.
They are also available from Phoenix Contact under their part number 187 80 37.
Figure R1.4 Power and Ethernet Connectors
Sensor Power
The sensor interface circuitry is opto-isolated from the rest of the NXEE2. In order to maintain this isolation,
the NXEE2 has separate power pins for the sensors. This also give you the ability to power the NXEE2 and
sensors at two different voltage levels. If you do not need this isolation, there are NXEE2 power pins on the 
I/O connector that allow you to easily jumper power from the NXEE2 to the sensors. Detailed information on
sensor power wiring can be found in the Powering the SSI Sensor section of the installation chapter, starting
on page 30.
Ethernet Connectors
Figure R1.4 also shows the location of the two Ethernet connections. These two RJ-45 ports are internally
connected through a switch. Both ports are used in redundant ring networks. Either can be used in non-redun-
dant networks. In non-redundant networks, the unused port can be used to daisy chain to the next device if
this simplifies wiring in your application.
I/O Connector
As shown in figure R1.5, the I/O Connector is located on
the top of the module. All sensor connections are made at
this connector as well as the channel’s discrete DC input.
Power connections for the NXEE2 are made through the
connector on the bottom of the module.
The mate for this connector is included with the NXEE2.
Spares are available from AMCI under the part number
MS-2X11. They are also available from Phoenix Contact
under their part number 173 88 98.
Ethernet Port 1
Ethernet Port 2
Bottom View
Power Connector
+Vdc
DC Return
Chasis GND (Shields)
DC Return
Figure R1.5 I/O Connector
11
10
9
8
7
6
5
4
3
2
1
NXEE2 TOP VIEW
Front of
NXEE2
J2
J1
+PWR
–PWR
OUTmod
OUTmod
SHIELD
–IN1
+IN1
GND
+V
–DATA1
+DATA1
–CLK1
+CLK1
sensor
sensor
+PWR
–PWR
INext
INext
SHIELD
–IN2
+IN2
GND
+V
–
DATA2
+DATA2
–CLK2
+CLK2
sensor
sensor
11
10
9
8
7
6
5
4
3
2
1
Ch 2
Sensor
Ch 1
Sensor

INTRODUCTION TO THE NXEE2 NXEE2 User Manual
ADVANCED MICRO CONTROLS INC.
16
Specifications
Sensors Supported
Any sensor that outputs data in single word SSI
format. Multi-word transfers are not supported.
Number of SSI bits transferred programmable from
1 to 32.
SSI clock frequency programmable to 125 kHz,
250 kHz, 500kHz, or 1 MHz.
Binary and Gray Scale formats supported.
Data Value
NXEE2 can be programmed to extract a Data
Value from the SSI data stream.
Data Value can be treated as a linear or rotary posi-
tion. (Data Values that are not positions can be
treated as linear values.)
Data Value can be scaled to engineering units
through use of Scalar Multiplier and Scalar
Divisor parameters.
Data Value can be offset with the Preset Value
parameter.
NXEE2 calculates velocity information based on
the rate of change in the Data Value
Number of Input Channels
Two
Number of I/O Words Required (16 bits each)
10 input words and 10 output words
Physical Dimensions
Width: 0.9 inches max.
Depth: 4.5 inches max.
Height: 3.9 inches
5.0 inches min. with mating connectors
Weight
0.38 lbs. (0.17 kg.) with mating connectors
Power Supply Requirements
24 to 48 Vdc ±20%, 
2 watts maximum (without sensors)
Channel DC Input
Used as general purpose I/O, to preset the Data
Value, or capture the Data Value on state
change.
Differential. 560 Vac/dc opto-isolated. Will with-
stand 3750VAC (RMS) for 60 seconds. (UL1577)
Can be wired as single ended input. Accepts 3.5
to 27 Vdc without the need for an external cur-
rent limiting resistor. 10mA current needed to
turn input on.
Status LED’s
See Status LED’s starting on page 14.
Mounting Location
DIN rail mount
EN 05 022 - 35 x 7.5 (35 x 7.5 mm) or
EN 05 022 - 35 x 15 (35 x 15 mm)
Environmental Specifications
Module rating of IP20.
Location must conform to IEC Pollution Degree 2
and Over Voltage Category II designations.
Input Power ....... 24 to 48Vdc, surge to 60Vdc
without damage to module.
Ambient Operating Temperature
........... -4° to 122°F (-20° to 50°C)
Storage Temperature
........... -40° to 185°F (-40° to 85°C)
Humidity ........... 0 to 95%, non-condensing
Connectors
Mating connectors are included with the NXEE2
and are available separately under the following
AMCI part numbers.
Connector AMCI Part # Wire Strip Length Min. Tightening Torque
I/O MS-2X11 28 - 16 AWG 0.275 inches Spring Cage Connector
Power MS-4M 28 - 12 AWG 0.394 inches 4.43lb-in (0.5 Nm)

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REFERENCE 2
DATA FORMATS
Network Output Data
Table R2.1 Network Output Data Format
Command Word Format
Bit 15, Transmit Bit - Used to control the flow of programming data to the NXEE2. The NXEE2 will not
accept new programming data until this bit makes a 01 transition. Once this bit is set, it should
remain set until the NXEE2 responds by setting the Acknowledge bit in the Network Input data. See
Programming Cycle on page 13 for a complete explanation of the NXEE2 programming sequence.
Bit 14, Save to FLASH Memory - This bit is used to store parameter values and calculated offsets into non-
volatile FLASH memory. Once stored, the parameter values will be used on every power up. This
means that you will not have to configure the NXEE2 on every start up.
The FLASH memory is limited to 10,000 write cycles. Do not save the offset to non-
volatile memory more than necessary to prevent a failure in the NXEE2.
Bits 13-6, Reserved - Must be set to ‘0’. A command error will result if any of these bits are set to ‘1’ when
the Transmit Bit makes a 01 transition.
This reference chapter details the output and input data formats used to commu-
nicate with the NXEE2.
15 14 13 12 11 10 9876543210
Network Output Data Word Numbers
0
Command Word
Transmit Bit
Save to FLASH
Memory
00000000
Change Reported
Input Values: CH2
Change Reported
Input Values: CH1
Apply Preset to
Data Value CH2
Apply Preset to
Data Value CH1
Write Config.
to CH2
Write Config:
to CH1
1
Configuration Word
Turn Off
Channel LED
Swap_32_bit_
words_endian
SSI Clk ƒ
00 = 125 kHz
01 = 250 kHz
10 = 500 kHz
11 = 1.0 MHz
Velocity
Update Time
Count
Direction
Data Type
Data Logic
Channel Input Function
(See table R2.2below.) Network Input Data Values (See table R2.3 below)
2Number of SSI Data Bits
Range of 1 to 32, Default of 24.
3MSB Number
Range of 1 to 32, Default of 1 Number of Data Value Bits Range of 1 to 28, Default of 24
4Scalar Multiplier
Range of 1 to {Scalar Divisor}, Default of 1
5Scalar Divisor
Range of 1 to 32,767, Default of 1
6Preset Value in 32 bit, 2’s-compliment format
Combined value of ±268,435,455 (±{228 – 1}), Default of 0
7
8Full Scale Count in 32 bit, 2’s-compliment format
Combined value of 0, or 2 to 268,435,456 (228), Default of 0
9

DATA FORMATS NXEE2 User Manual
ADVANCED MICRO CONTROLS INC.
18
Network Output Data (continued)
Command Word Format (continued)
Bit 5, Change Reported Input Values: CH2 - Set this bit to change the channel 2 data values transmitted from
the NXEE2 to the host. The transmitted data values are selected by the Network Input Data Values
bits of the Configuration Word. Note that the two channels can be programmed at the same time.
Bit 4, Change Network Data Format: CH1 - Set this bit to change the channel 1 data values transmitted from
the NXEE2 to the host. The transmitted data values are selected by the Network Input Data Values
bits of the Configuration Word. Note that the two channels can be programmed at the same time.
Bit 3, Apply Preset to Data Value: CH2 - Set this bit to preset the Data Value for channel 2. The Data Value
will change to the last programmed Preset Value for channel 2. The Preset Value is programmed as
part of the configuration data when bit 1 of this word, the Write Configuration: Channel 2 bit is set. If
you want to change the Preset Value and set the Data Value to it in one cycle, then both of these bits
must be set.
Bit 2, Apply Preset to Data Value: CH1 - Set this bit to preset the Data Value for channel 1. The Data Value
will change to the last programmed Preset Value for channel 1. The Preset Value is programmed as
part of the configuration data when bit 0 of this word, the Write Configuration: Channel 1 bit is set. If
you want to change the Preset Value and set the Data Value to it in one cycle, then both of these bits
must be set.
Bit 1, Write Configuration: CH2 - Set this bit to change the configuration for channel 2. All of the parameters
in the remaining output words are programmed when this bit is set. Note that the two channels can be
programmed at the same time.
Bit 0, Write Configuration: CH1 - Set this bit to change the configuration for channel 1. All of the parameters
in the remaining output words are programmed when this bit is set. Note that the two channels can be
programmed at the same time.
It is possible to wrote configuration data, apply the new preset to the data value, and change
the reported input values with one write cycle. Any combination of these actions can be pre-
formed within one write cycle.
Configuration Word Format
Bit 15, Turn Off Channel LED - Set this bit to ‘1’ to disable the channel’s front panel status LED. The channel
will still operate and send data in the Network Input Data words associated with the channel.
Bit 14, Swap_32_bit_words_endian - The unit will select the big or small endian format for 32 bit values
based on the protocol that the NXEE2 is configured for. For EtherNet/IP, the default order is little
endian, (least significant bits first). For PROFINET and Modbus-TCP, the default format is big
endian, (most significant bits first). To use the default format, reset this bit to “0”. If your host con-
troller does not use the default order of the protocol, set this bit to “1” to reverse the word order.
Bits 13&12, SSI Clock Frequency - These two bits set the frequency of the channel’s SSI clock. The default
frequency of 125KHz allows for the greatest sensor cable length. Also, increasing the frequency will
not decrease the network transfer time to your host controller. The frequency should only be
increased if your sensor cannot operate at 125KHz.
Bit 11, Velocity Update Time - Set this bit to ‘0’ to have the velocity data update every 160 milliseconds. Set
this bit to ‘1’ to have the channel’s velocity data update every 24 milliseconds.
This parameter only affects the calculation rate of the Velocity data. It has no effect on the net-
work transfer rate to and from your host controller.
Bit 10, Count Direction - Set this bit to ‘0’ to have the count direction be the same as the SSI sensor’s. Set this
bit to ‘1’ to have the count direction be the reverse of the sensor’s.

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NXEE2 User Manual DATA FORMATS
19
Network Output Data (continued)
Configuration Word Format (continued)
Bit 9, Data Type - Set this bit to ‘0’ if your SSI sensor transmits its data in binary. Set this bit to ‘1’ if your SSI
sensor transmits its data in Gray Code.
Bit 8, Data Logic - Set this bit to ‘0’ if your SSI sensor transmits its data using positive logic. Set this bit to ‘1’
if your SSI sensor transmits its data using negative logic.
Bits 7–4, Channel Input Function - Use the table below to define the functionality of the channel’s discrete
input.
Table R2.2 Function of Channel Input
Bits 3–0, Network Input Data Values - Use the table below to define the data transmitted to the host in the Net-
work Input Data.
Table R2.3 Network Input Data Values
Error Response
If there is an error in the data sent to the NXEE2, the module responds by setting the appropriate error bit in
the Network Input Data. See the Network Input Data section, starting on page 20 for a full explanation of the
error bits. The only way to clear an error bit is to program the module with valid data. A global “Clear Errors”
bit does not exist.
Bit 7 Bit 6 Bit 5 Bit 4 Function
0 0 0 0 General Purpose Input. State reported in network input data.
(Factory Default)
0 0 0 1 Apply Preset to Data Value on Rising Edge and save offset in RAM
0 0 1 0 Apply Preset to Data Value on Falling Edge and save offset in RAM
0 0 1 1 Apply Preset to Data Value on Both Edges and save offset in RAM
0 1 0 0 Capture the Data Value on Rising Edge
0 1 0 1 Capture the Data Value on Falling Edge
0 1 1 0 Capture the Data Value on Both Edges
All other combinations Reserved
Bit 3 Bit 2 Bit 1 Bit 0 Function
0 0 0 0 Data Value in words 2 & 3 for channel 1, words 6 & 7 for channel 2
Actual SSI Value in words 4 & 5 for channel 1, words 8 & 9 for channel 2
(Factory Default)
0 0 0 1 Data Value in words 2 & 3 for channel 1, words 6 & 7 for channel 2
Velocity Data in words 4 & 5 for channel 1, words 8 & 9 for channel 2
0 0 1 0 Velocity Data in words 2 & 3 for channel 1, words 6 & 7 for channel 2
Actual SSI Value in words 4 & 5 for channel 1, words 8 & 9 for channel 2
0 0 1 1 Data Value in words 2 & 3 for channel 1, words 6 & 7 for channel 2
Captured Value in words 4 & 5 for channel 1, words 8 & 9 for channel 2
0 1 0 0 Velocity Data in words 2 & 3 for channel 1, words 6 & 7 for channel 2
Captured Value in words 4 & 5 for channel 1, words 8 & 9 for channel 2
All other combinations Reserved

DATA FORMATS NXEE2 User Manual
ADVANCED MICRO CONTROLS INC.
20
Network Input Data
Figure R2.1 shows the format of the data sent to the host by the NXEE2.
Figure R2.1 Network Input Data
Status Word Format
Each channel has a status word associated with it. These bits show the status of the channel as well as any
programming errors that may have occurred. The status word for channel 1 also contains status bits for the
module as a whole. These bits are not repeated for channel 2.
Bit 15, Acknowledge Bit (Ch1 Only) - Used to control the flow of programming data to the NXEE2. The
NXEE2 sets this bit in response to the Transmit bit being set by the host. Programming error bits in
the two status words are only valid while the Acknowledge bit is set. Once this bit is set, it will
remain set until your host controller resets the Transmit Bit. See Programming Cycle on page 13 for
a complete explanation of the NXEE2 programming sequence.
Bit 14, Heartbeat Bit (Ch1 Only) - This bit changes state every 500 milliseconds. It is used to verify active net-
work communications with the NXEE2.
Bit 13, Value Captured - When the channel’s discrete DC input is configured to capture the Data Value, this
bit is set to ‘1’ whenever a new captured Data Value is available. If the Network Input Data Values
parameter is configured to transmit the captured Data Value, it will be available in the channel’s
Value 2 words. A 0 1 transition on the Transmit Bit is the only way to clear the Value Captured
bits. This is accomplished by three writes to the first Network Output Data word in the following
sequence: 16#0000, 16#8000, 16#0000. This will clear the Value Captured bits without changing
any of the module’s programmable parameters.
The NXEE2 will not capture a value while this bit is set to “1”. The state of the input is still
reported with the CH Input State bit, (see below), but the Captured Data Value registers will
not be updated.
15 14 13 12 11 10 9876543210
Network Input Data Word Numbers
0
Channel 1 Status Word
Acknowledge
Bit
Heartbeat
CH1 Value
Captured
CH1
Input State
Memory Error
CH1 FSC
Exceeded
CH1 FSC
Error
CH1 Preset
Value Error
CH1 Scalar
Errors
CH1 SSI
Setup Errors
CH1 Config.
Error
CH1 Cmd
Error
CH1 Velocity
at Zero
CH1 Motion
Direction
0 0
1
Channel 2 Status Word
0 0
CH2 Value
Captured
CH2
Input State
0
CH2 FSC
Exceeded
CH2 FSC
Error
CH2 Preset
Value Error
CH2 Scalar
Errors
CH2 SSI
Setup Errors
CH2Config.
Error
CH2 Cmd
Error
CH2 Velocity
at Zero
CH2 Motion
Direction
0 0
2Channel 1 Value 1
Value determined by Network Input Data Values bit field. See table R2.3 on page 19.
3
4Channel 1 Value 2
Value determined by Network Input Data Values bit field. See table R2.3 on page 19.
5
6Channel 2 Value 1
Value determined by Network Input Data Values bit field. See table R2.3 on page 19.
7
8Channel 2 Value 2
Value determined by Network Input Data Values bit field. See table R2.3 on page 19.
9