Acromag BusWorks 900EN Series User manual

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Find the Acromag BusWorks 993EN-4016 at our website: Click HERE

BusWorks® 900EN Series
Modbus TCP/IP 10/100MB Industrial Ethernet I/O Modules
Industrial Grade:
Model 993EN-4016 Sixteen CH Single-Ended Current Inputs
Model 994EN-4016 Sixteen CH Single-Ended Voltage Inputs
Commercial Grade:
Model 993EN-4C16 Sixteen CH Single-Ended Current Inputs
Model 994EN-4C16 Sixteen CH Single-Ended Voltage Inputs
USER’S MANUAL
ACROMAG INCORPORATED Tel: [phone]
30765 South Wixom Road Fax: [phone]
Wixom, MI 48393-2417 U.S.A. Email: [e-mail]
Web: http://www.acromag.com
Copyright 2009-2014 Acromag, Inc., Printed in the USA.
Data and specifications are subject to change without notice. 8500814G

BusWorks® 993/4EN User’s Manual Modbus TCP/IP Analog Input
_________________________________________________________________________________
_______________________________________________________________________________________
Acromag, Inc. Tel:[phone] Fax:[phone] Email:[email protected] http://www.acromag.com
2
IMPORTANT SAFETY CONSIDERATIONS
You must consider the possible negative effects of power, component,
wiring, sensor, or software failure in the design of any type of monitoring or
control system. This is very important where property loss or human life is
involved. It is important that you perform satisfactory overall system design
and it is agreed between you and Acromag, that this is your responsibility.
GETTING STARTED
QUICK START…………………………………………
3
MOUNTING AND DIMENSIONS……………………....
5
CONTROLS & INDICATORS..…………………………
5
ISOLATION BARRIERS..……………………………….
5
CONNECTIONS………………………………………….
6
DIN-Rail Mounting & Removal….………………
6
Network……………………………………………..
6
Power………………………………………………..
8
Earth Ground..………………………………….….
9
Analog Inputs...…………………………………...
9
Analog Common...……………………………..…
10
WEB BROWSER………………………………………...
11
Home Page…………………………………………
11
Password Configuration Page.………………...
12
Network Configuration Page…………………...
12
Input Configuration Page..………………………
15
Test Page..…………………………………………
20
Calibration Page………..…..…………………….
21
Utility Page………………………..……………….
28
TROUBLESHOOTING………………….………………
30
Diagnostics Table……………………………..….
30
Trouble Browsing Your Module?.....................
32
Getting Out Of Trouble & Sanitation..…………
32
TECHNICAL REFERENCE
KEY FEATURES………….……………………………..
33
HOW IT WORKS………….………….………………….
34
MODBUS REGISTERS…………………………..……..
35
Register Functions……………………………….
35
Register Mirroring……….……………………….
36
Data Types…………………………………………
37
Register Map………………………………………
38
Default Register Settings……………………….
45
SPECIFICATIONS………………………………….…...
46
Model Numbers….…………………………..……
46
Analog Inputs………..………....………………….
46
Memory………………………………..……………
49
Enclosure and Physical………………………….
50
Agency Approvals…..…………………………....
50
Environmental…………………………..………...
50
Reliability Predictions (MTBF)………………….
51
Ethernet Interface…………………………………
52
Controls & Indicators…………………………....
52
ACCESSORY CABLES……..………………………….
53
Patch Cable & Crossover Cable…………….…
54
REVISION HISTORY……………………………………
55
TABLE OF
CONTENTS
Symbols on equipment:
Means “Refer to User’s
Manual (this manual) for
additional information”.
The information of this manual
may change without notice.
Acromag makes no warranty
of any kind with regard to this
material, including, but not
limited to, the implied
warranties of merchantability
and fitness for a particular
purpose. Further, Acromag
assumes no responsibility for
any errors that may appear in
this manual and makes no
commitment to update, or
keep current, the information
contained in this manual. No
part of this manual may be
copied or reproduced in any
form without the prior written
consent of Acromag, Inc.
For additional information,
please visit our web site at
www.acromag.com and
download our whitepaper
8500-765, Introduction to
Modbus TCP/IP, or 8500-648,
Introduction to Modbus.
This product is compatible
with Internet Explorer 7 and
Mozilla Firefox v2.0
Windows® is a registered
trademark of Microsoft
Corporation.
!

BusWorks® 993/4EN User’s Manual Modbus TCP/IP Analog Input
_________________________________________________________________________________
_______________________________________________________________________________________
Acromag, Inc. Tel:[phone] Fax:[phone] Email:[email protected] http://www.acromag.com
3
If you already know the basics of connecting power, connecting a network
cable, and using a web-browser, and you only need some help establishing
communication, here is a brief outline of what you must do to start
communicating with this device right away and where to go for help.
This is a web-enabled Ethernet device that allows you to use your web-
browser to set it up and operate it. All Ethernet devices have a unique IP
address that you are required to know in order to communicate with them
using your web-browser.
What if you do not already know the IP address of the unit?
All Acromag Ethernet devices include an alternate default mode of operation
with a fixed IP address set to 128.1.1.100. Additionally, the user-
programmable IP address that is used outside of default mode is also initially
set to 128.1.1.100 from the factory. If this unit is fresh from the factory, you
can talk to it at this address in either mode.
If your unit is not as shipped from the factory and may have another IP
address set, then…
You need to place the unit in its Default Mode, which allows you to address it
at IP address 128.1.1.100 (http://128.1.1.100).
You place this unit into Default Mode by depressing the push button marked
“DFT” for about 5 seconds (see front figure at right), just until the yellow
STATUS LED starts blinking slowly to indicate the unit is in the Default
Mode. Let go of DFT button when Status LED starts blinking.
Try browsing the unit with your web browser address at http://128.1.1.100.
If your unit is in default mode, you should be presented with the home page
(and your Status LED should continue to blink).
If you are using IP address 128.1.1.100, and you still can’t talk to the unit…
You cannot talk to this device at IP address 128.1.1.100 if the Network
Interface Card you are using to connect to our device is set to an IP address
outside of the address domain established by this default address. You
must set the IP address of your network interface to an address like
128.1.1.x, where x is an integer from 1 to 254, except 100 (our default
address). This procedure is covered in document 8500-815 shipped with
your unit. It is also detailed in Application Note 8500-734, which you can
obtain from the CDROM shipped with your unit, or optionally via download
from our web site at www.acromag.com.
You managed to browse to the unit’s Home Page, but now you need to get
to the Network Configuration Page to set your own IP address…
In order to access any of the other web configuration pages, like the Network
Configuration Page, you will need to first enter a Username = User, and
Password = password00 to gain access (these are the default username
and password settings for all BusWorks models and these entries are case-
sensitive).
QUICK START
Guide to Quickly
Establishing
Communication
ACT
ST
RUN
DFT
ETHERNET
LINK
MODULESTATUS
LED(YELLOW)
AcromagAcromag
DEFAULTADDRESS
PUSHBUTTONSWITCH:
PRESSTOSET
DEFAULTADDRESS

BusWorks® 993/4EN User’s Manual Modbus TCP/IP Analog Input
_________________________________________________________________________________
_______________________________________________________________________________________
Acromag, Inc. Tel:[phone] Fax:[phone] Email:[email protected] http://www.acromag.com
4
Your unit is not as shipped from the factory and you do not know the
Username and Password settings…
If you forget your user name & password, you can always toggle the unit into
default mode via the DFT toggle switch at the front of the unit (hold this
toggle 4 seconds to invoke default mode). In this mode, the password and
username will revert to the original defaults of “User” and “password00” (unit
assumes an IP address of 128.1.1.100 in its default mode), allowing you to
re-invoke the Password Configuration Page and change the username and
password settings as required.
If after applying power, your green RUN LED is not solid ON and is blinking
continuously, you need to do the following:
Normally on power-up, the green RUN LED will blink for about 24 seconds
during initialization, then stay ON. But if you powered the unit up without
making your network connection, the green RUN LED will continue to blink.
If RUN continues to blink, first check that your network cable is connected to
the unit and to your PC. If you replaced the network cable after powering-up,
the RUN LED should stop blinking after about 15 seconds once a network
link has been established. Once the link is established, the green RUN LED
should not continue to blink and should stay ON. This applies even if you
later remove the cable while powered up.
If you have checked your network connections and the green RUN LED
continues to blink…Reset, Restore, Return:
Reset: Try resetting the unit by cycling the power to the unit. After about 24
seconds, the green REN LED should remain ON
Restore: If you’ve tried resetting the unit and the green RUN LED still
continues to blink, then you may need to follow the procedure for restoring
the module to its initial configuration. This procedure is located at the end of
the Trouble-Shooting section of this manual under “Getting Out Of Trouble”
on page 32. Note that this is also the procedure used to sanitize the unit for
de-commissioning. You should only do this as a last resort, as this
procedure restores everything to its default state—all holding registers,
network settings, and any calibration you may have performed.
If you do use restore and want to return the unit to service, the calibration
reference itself will additionally have to be “restored” separately via the
Restore Factory Voltage Reference Value button of the Input Calibration
Page. Inputs will be calibrated automatically by default, but any manual
calibration you may have done to improve accuracy is lost after restore and
may need to be rechecked.
Return: At this point, if the green RUN LED continues to blink after resetting
and after restoring, then you may need to return the unit for repair.
If you need additional help and you have already reviewed the material in
this manual, please contact the factory.
QUICK START
Guide to Quickly
Establishing
Communication

BusWorks® 993/4EN User’s Manual Modbus TCP/IP Analog Input
_________________________________________________________________________________
_______________________________________________________________________________________
Acromag, Inc. Tel:[phone] Fax:[phone] Email:[email protected] http://www.acromag.com
5
44 41 36 33
PWR
NETWORK
TB4 TB4
13
IN02
16
IN05
21
IN06
24
IN09
TB1
IN14 IN12
GND
46 4345
RX
3542
DC-
DC+
34 32 31
TB1
11 1412
IN00 IN03 IN01
TB2
15 22
TX
IN04 IN07
TB4
TB3
23 25 26
IN08 IN10 IN11
DC
PWR
COM COM
IN15
TB2TB2
IN13
ANALOG IN
ANALOG IN: 12-15
ANALOG IN
5.0V
ANALOG IN: 0-5
ANALOG IN
ANALOG IN: 6-11
TRANSFORMER
3.3V
TB3
993/4EN
ISOLATION
DIAGRAM
TRANSFORMER
The front panel DFT push-button is used to toggle the module into or out of
Default Mode. In Default Communication Mode, the module assumes a fixed
static IP address of “128.1.1.100”, a default subnet mask of “255.255.255.0”,
a default username of “User”, and a default password of “password00”. To
activate, depress the DFT button for 5 seconds, until the ST LED blinks
on/off slowly. To disable, depress the DFT button for 5 seconds or until the
ST LED stops blinking.
MOUNTING AND
DIMENSIONS
Unit mounts to “T” type DIN
rails (35mm, type EN50022).
Units may be mounted side-
by-side on 1-inch centers.
WARNING: IEC Safety
Standards may require that
this device be mounted within
an approved metal enclosure
or sub-system, particularly for
applications with exposure to
voltages greater than or equal
to 75VDC or 50VAC.
CONTROLS &
INDICATORS
Green Run LED is ON if power
is on and will blink in “wink” ID
mode.
Yellow ST LED blinks ON/OFF
slowly if module is in default
communication mode.
Green LINK LED is ON if auto-
negotiation has successfully
established a connection.
Yellow ACT LED signals PHY
network Activity (busy).
ISOLATION BARRIERS
Dashed Lines denote isolation
barriers.
The I/O circuit, network, and
power circuits are isolated
from each other for safety and
noise immunity.
11
46
14
43
22
35
25
32
COM COM
DC-
IN00 IN03 IN07 IN10
ACT
ST
RUN
TB1
13 1612 15
44 4145 42
TB2
21 2423
36 3334
26
31
DFT
TB1TB1
ANALOG IN: 0-5
IN14 IN12 IN15 IN13
4.35
(110.5)
TB2
GND
DC+
TB3
TB4TB4
IN02 IN05 IN01 IN04 IN06 IN09
TB3
IN08 IN11
ETHERNET
LINK
MODEL 994EN-4016
TB4
REMOVABLE
RJ45ETHERNET
CONNECTOR
AcromagAcromag
3.90
(99.1)
ANALOG IN: 6-11
MODEL 994EN-4C16
PWR
ANALOG IN: 12-15
(PLUG-INTYPE)
TERMINALBLOCKS
RUN/PWRLED(GREEN)
MODULESTATUS
LED(YELLOW)
DEFAULTADDRESS
PUSHBUTTONSWITCH:
PRESSTOSET
DEFAULTADDRESS
MODEL 993EN-4016
MODEL 993EN-4C16
ETHERNETLINK(GREEN)
ANDACTIVITY LED(YELLOW)
46 44 43 41 36 35 33
DC-
32
TB1
11
IN00 COM
13
IN02 IN14
14
IN03 COM
16
IN05 IN12
TB4
21
IN06
22
IN07
24
IN09 GND
25
IN10
45 42
PWR
DC+
3134
L
C
ACT
ST
3.75 (95.3)
TB1
12
IN01
TB4
IN15
TB2
TB2
15
IN04
TB3
IN13
2623
IN08 IN11
TB3
4.68 (118.9)
3.90
(99.1)
DFT
ANALOGIN: 12-15
2.34 (59.4)
ETHERNET
ANALOGIN: 0-5
LINK
Acromag
RUN
ANALOGIN: 6-11
1.05
(26.7) "T"RAILDINMOUNTING
DINEN50022,35mm 4.35
(110.5)
NOTE:DimensionsAreINCHES(MILLIMETERS).
MODEL 993EN-4016
MODEL 993/4ENENCLOSURE DIMENSIONS
MODEL 993EN-4C16
MODEL 994EN-4016
MODEL 994EN-4C16

BusWorks® 993/4EN User’s Manual Modbus TCP/IP Analog Input
_________________________________________________________________________________
_______________________________________________________________________________________
Acromag, Inc. Tel:[phone] Fax:[phone] Email:[email protected] http://www.acromag.com
6
1
8
7
5
4
2
1
100M
100M
CLIP
8
6
3
CABLE
8
1
10Base-T CAT 5UTP/STP
Not Used
Not Used
Not Used
Not Used
Receive-
Receive+
RJ-45CONNECTOR
SPEED
PIN
DISTANCE
Transmit -
Transmit +
MDI-X WIRING
100Base-T CAT 3, CAT 4, orCAT 5UTP/STP
NoteCrossoverConnections
MINIMUMRECOMMENDEDCABLE
Not Used
Not Used
Not Used
Not Used
Transmit -
Transmit + ETHERNET PORT
RJ45 MDI ANDMDI-X CONNECTIONS
Receive-
Receive+
MDI WIRING
45 44 42 41 33
DC+
31
TB4
12 13 15 16 21 23 24 26
TB1
GND
46 43
PWR
DC-
32
11 14 22
TB3
25
PUSH
TB2
"T" TYPE
DIN RAIL
PUSH SCREWDRIVER AS SHOWN
TO TILT AND LIFT MODULE OFF RAIL
Remove Terminal Blocks On This
Side To Provide Clearance
Any Series 9XXEN Ethernet Module
MODULE REMOVAL
FROM DIN RAIL
PRYWITH SCREWDRIVER
INSERTED IN SLOT HERE
(DO NOT TWIST TO AVOID
DAMAGING PLASTIC TAB)
USE YOUR FINGER TO APPLY
DOWNWARD PRESSURE HERE
AS YOU LIFT AND TILT MODULE
TO REMOVE IT FROM RAIL
When attaching the module to the
T-type DIN rail, angle the top of the
unit towards the rail and locate the
top groove of the adapter over the
upper lip of the rail. Firmly push the
unit towards the rail until it snaps into
place. To remove, first separate the
input terminal block(s) from the
bottom side of the module to create a
clearance to the DIN mounting area.
Next, while holding the module in
place from above, insert a
screwdriver into the lower arm of the
DIN rail connector and use it as a
lever to force the connector down
until the unit disengages from the rail
(do not twist the screwdriver to avoid
damaging plastic).
The Ethernet port of this unit is wired MDI-X by default, but includes
automatic crossover (the Ethernet port of your PC is typically wired MDI).
Thus, you can use either a straight-through or crossover cable to connect
this device directly to a PC, Ethernet switch, or another unit.
CONNECTIONS
DIN-Rail
Mounting & Removal
Network
For 100Base-TX systems, at a
minimum, use data grade
Unshielded Twisted-Pair
(UTP) wiring that has a 100Ω
characteristic impedance and
meets the EIA/TIA Category 5
wire specifications.
It is recommended that you
use a CAT-5 cable to connect
this device to your PC.
For 10Base-T systems, you
may use Category 3, Category
4, or Category 5/5E UTP/STP
cable.
In either case, you are limited
to 100 meters between any
two devices.

BusWorks® 993/4EN User’s Manual Modbus TCP/IP Analog Input
_________________________________________________________________________________
_______________________________________________________________________________________
Acromag, Inc. Tel:[phone] Fax:[phone] Email:[email protected] http://www.acromag.com
7
1
1
3
6
1
6
2
3
1
8
281
8
8
1
PINS: 1TO 3
2TO6
3TO1
6TO2
RJ45(ClipSideDown) RJ45(ClipSideDown)
FOR DIRECTPC TO
ETHERNETMODULE
CONNECTIONS
CROSSOVER CABLE
FOR MDI TO MDI
OR MDI-X TO MDI-X CROSSOVER
CONNECTIONS
From the factory, the 993/4EN unit has a default IP address setting of
128.1.1.100, and a class C subnet mask of 255.255.255.0. This defines a
restricted default address domain that your current network cannot address
directly, unless you first create an exclusive subnet targeted to the 993/4EN.
This typically involves a process by which you either change the address of
your current network interface card (which will temporarily disable it from
your own network), install a second network interface card, or obtain an
unused PC or laptop with a NIC installed. In any case, you must set the
address of your network interface card to an address within the default
address domain of the Acromag unit. That is, an address from 128.1.1.0 to
128.1.1.255, except for 128.1.1.0 which is typically reserved for servers, and
128.1.1.100, which is the default address of the 993/4EN itself. Once you
are able to address the unit at its default address, you can then reconfigure
its IP address setting to an address more meaningful to your own network.
Application Note 8500-734 is downloadable from the Acromag website and
covers this process in greater detail.
ETHERNET
DFT
ST
RUN
AcromagAcromagAcromag
LINK ACT
HOSTPC
(USEREGULARORCROSSOVERCABLE)
CAT-5UTPCABLE
UPTO100METERS
ACROMAG993/4EN
ETHERNETMODULE..
THEETHERNETPORTOFTHIS
MODULEISWIREDMDI-X,BUT
SUPPORTAUTOMATICCROSSOVER.
HOST PC CONNECTED DIRECTLYTO AMODULE
Refer to the Accessory Cables section at the back of this manual for more
information on accessory cables including patch and crossover cables
available from Acromag and other vendors.
TIP: You can significantly enhance the EMI/RFI performance of your
network connections by using Category 5E STP cable (Shielded Twisted
Pair) with shielded RJ45 plug connectors. This will also help to protect your
installation from damage due to ESD (Electro-Static Discharge). The use of
shielded cable is strongly recommended for installations in harsh industrial
environments and/or in the presence of strong electrical fields.
CONNECTIONS
Network
A crossover cable simply
connects the differential
transmit pair on each end, to
the receive pair on the
opposite end.
Use a standard (direct) cable
when connecting to a hub or
switch port, which are
generally wired MDI-X.

BusWorks® 993/4EN User’s Manual Modbus TCP/IP Analog Input
_________________________________________________________________________________
_______________________________________________________________________________________
Acromag, Inc. Tel:[phone] Fax:[phone] Email:[email protected] http://www.acromag.com
8
You can use an Ethernet switch or switching hub to build a network of
Ethernet modules, similar to that shown below. This drawing shows how to
network-connect these modules to a 5-port Ethernet switch (Acromag Model
900EN-S005). Note that the 900EN-S005 switch includes automatic
MDI/MDI-X crossover and straight-through or crossover cable(s) may be
used, but it is generally not good practice to use crossover cables when
connecting to an auto-crossing switch.
✓Connect 18-36V DC to the power terminals labeled DC+ & DC-.
Observe proper polarity. For supply connections, use No. 14 AWG
wires rated for at least 75C. CAUTION: Do not exceed 36VDC peak.
+
34 31
DC+
36 35 33 32
DC-
PWR
TB3
TB3
GND
CAUTION: Risk of Electric Shock –More than one disconnect switch may
be required to de-energize equipment before servicing.
IMPORTANT –External Fuse: If unit is powered from a supply capable of
delivering more than 1A to the unit, it is recommended that this current be
limited via a high surge tolerant fuse rated for a maximum current of 1A or
less (for example, see Bel Fuse MJS1).
CONNECTIONS
Network
Power
Voltage
Current
(Typ)
Current
(Max)
18 VDC
82 mA
101 mA
24 VDC
63 mA
83 mA
36 VDC
44.8 mA
51 mA
X5
X4
X2
X1
P1
X3 X4
DE F
RU N ST
X3
S1 S2 36 35
DC-
33
DC+
32
TB4 TB3
RU N
X1
X5
X2
ACTLINK
ST
RU N
ETHERNET
ACTLINK
ST
RU N
ETHERNET
ACT
LINK
ST
RU N
ETHERNET
AcromagAcromagAcromag
ETHERNETETHERNET
AcromagAcromagAcromag
PGM
PORT
GND
DC+
POW E R
34 31
DE F
DE F
DE F
AcromagAcromagAcromag
ACTLINK
ETHERNET
HOSTPC
DIP SW S1/S2
CFG OP TION S
CAT-5UTPCABLE
UPTO100METERS
(StraightThroughor Crossover Cable)
CAT-5UTPCABLE
UPTO100METERS
(StraightThroughor Crossover Cable)
Order Acromag CableModel 5035-355
AcromagAcromagAcromag
AcromagAcromagAcromag
CAT-5UTPCABLE
UPTO100METERS
PUSH TO RESET
900EN-S005
(StraightThroughor Crossover Cable)
CAT-5UTPCABLE
UPTO100METERS
CAT-5UTPCABLE
UPTO100METERS
(StraightThroughor Crossover Cable)
Acromag 900EN-S005
5-PortEthernet Switch
or equivalent.
Theethernet portofthis
switchareautomaticMDI/MDI-X
crossover anddonotrequire
crossover cables.
(StraightThroughor Crossover Cable) Acromag 993/4EN
Ethernet Modules.
Theethernet portofthis
modulesupports
automaticMDI/MDI-X
crossover, andiswired
MDI-X
USEOFAN ETHERNETSWITCHTONETWORK
AHOSTPCTOMORETHANONEMODULE
Acromag offers astraight-throughpatchcable(Model 5035-355),or a
crossover cable(Model 5035-360) for usewithSeries 9xxEN modules.
Note:This MDI-to-MDI-Xconnectiondoes notrequiretheuseof acrossover cable.

BusWorks® 993/4EN User’s Manual Modbus TCP/IP Analog Input
_________________________________________________________________________________
_______________________________________________________________________________________
Acromag, Inc. Tel:[phone] Fax:[phone] Email:[email protected] http://www.acromag.com
9
✓Connect Earth Ground as shown in the connection drawings on previous
page. Additionally, connect the GND terminal (TB3-3) to earth ground.
The ground connections noted are recommended for best results. If
sensors are already grounded, use caution and avoid making additional
ground connections which could create ground loops.
Transient energy is shunted to the GND terminal via isolation
capacitors and transient voltage suppressors. You must connect
earth ground to complete this path and ensure protection.
Additional earth grounding is also recommended at input analog
common (see connection drawings).
✓Connect analog current (993EN), or voltage (994EN) signals to the input
terminals as shown below. Input channels are single-ended. TB1 and
TB2 each support 6 single-ended input channels while TB4 supports 4
single-ended inputs and two Common returns (C). The common
connections are used to reference input channels to analog common.
This terminal is also used to reference the input circuit common to earth
ground if it would otherwise be floating.
Current Inputs (993EN Models Only)
Input is bipolar with respect to common, which allows current to be input
on either lead. Current (±20mA) is converted to voltage (±4.0V) via
precision 200Ωshunt resistors inside the unit. This voltage drives a 16-
bit A/D with a full-scale input range of ±10V.
+
-
+
IC C 13 +
RDC mA
TB4 15
(993EN) 14 12
To A/D
(+/-10V)
(mA)
200
DC
CURRENT
MUX
993ENSIMPLIFIED
INTERNAL CONNECTIONS
(ONE CHANNEL)
SHIELDED CABLE
C15 C13 ++
-
+
TB4 12
14
XMTR
DC
PWR (993EN) DCmA R ToA/D
(+/-10V)
MUX
NOTE: GROUNDING
2-WIRE
200
993EN SIMPLIFIED
INTERNALCONNECTIONS
(ONECHANNEL)
IF CURRENT LOOP IS NOT ALREADY
GROUNDED, THEN IT IS RECOMMENDED
THAT YOU CONNECT COMMON (C) TO EARTH
GROUND AS SHOWN.
CONNECTIONS
Earth Ground
Warning: To comply with
safety and performance
standards, use shielded cable
and connect earth ground as
noted. Failure to use good
wiring and grounding practices
may be unsafe and negatively
affect performance.
Analog Inputs
The Common (C) terminal is
connected to analog common
of the circuit. This is used to
reference analog input
common to earth ground, and
to reference the input channels
to earth ground if they would
otherwise be left floating.

BusWorks® 993/4EN User’s Manual Modbus TCP/IP Analog Input
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10
I
TB4
C14 C12
-
+
-
+
+
R
+
15 13 MUX
24V
DC
(993EN)
200
(mA) EARTH
GROUND
SHIELDED CABLE
NOTE: YOU MAY INPUT CURRENT ON EITHER
LEAD WITH BIPOLAR DIFFERENTIAL INPUT.
CURRENT
DCmA ToA/D
(+/-10V)
IT IS RECOMMENDED THAT YOUR CURRENT
LOOP BE EARTH GROUNDED AT SOME POINT.
FOR BEST RESULTS, DO NOT ALLOW
DIFFERENTIAL INPUTS TO FLOAT
DCS/PLC
OROTHER
CONTROL
CONNECT ANALOG COMMON
(C) TERMINAL TO EARTH GROUND.
Voltage Inputs (994EN Models Only)
You can set the channel to accept fixed voltage input ranges of ±10V, or
±5V. You may also rescale a portion of ±10V A/D range to a smaller
sub-range, down to a minimum span 1/16th of the native 20V span in
order to maintain minimum 12-bit performance.
DC +
TB4 C14 C12 +R
-
V
+
15 13
(Volts) MUX
SHIELDED
CABLE
(994EN) To A/D
(+/-10V)
VOLTAGE 994ENSIMPLIFIED
INTERNAL CONNECTIONS
(ONE CHANNEL)
CONNECT INPUT VOLTAGE AS
SHOWN. OBSERVE PROPER
POLARITY.
INPUT RANGESARE +/-10V, +/-5V,
ORUSER-SCALED.
Connect input voltage to input positive (+) and negative (-) while
observing proper polarity. If the input source is floating, it is
recommended that you connect the negative input to the analog
common terminal of the port (terminal C). Additionally, analog common
(C) should also be connected to earth ground at one point.
✓Plug-in terminal block TB4 includes two common connections marked
“C”. This connects to analog common of the input circuit and should
also connect to earth ground. Check your signal grounding scheme, and
if inputs are clamped or appear unstable, as you may need to add an
earth ground connection at “C” if your input signals are not already earth
grounded. Note that you only need to connect earth ground to one of
these common terminals to earth ground the input circuit.
CONNECTIONS
Analog Inputs
Analog Common

BusWorks® 993/4EN User’s Manual Modbus TCP/IP Analog Input
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This module supports Modbus over TCP/IP. You may use your own
software to issue Modbus commands to this module (see Modbus
Registers), or you may use a standard web browser, as these modules have
built-in web pages that allow you to setup and control the module. Simply
execute your web browser, type the IP address assigned to your module in
the “Address” window (http://128.1.1.100/ for our example), click [Go], and
you will be presented with a Home Page window similar to that shown below:
For each new browser session
that accesses the Home Page
of this module, you will be
presented with a window
prompting you to enter the
current User Name and
Password as shown on the
following page. This information
is required before the program
will allow you to make any other
selections. The default user
name and password is “User”
and “password00”
respectively. After entering
these defaults, you may wish to
invoke the Password
Configuration Page to change
these parameters to something
more meaningful to you.
IMPORTANT: If you forget your user name & password, you can always
toggle the unit into default mode via the DFT push-button at the front of the
unit (hold this button for 5 seconds to invoke default mode). In this mode,
the password and username will revert to the original defaults noted (unit
assumes IP address 128.1.1.100), allowing you to re-invoke the Password
Configuration Page and change the username and password as required.
WEB BROWSER
Home Page
The Home Page provides
buttons to access the other
web pages of this module
that are used to configure
the network parameters,
change the user name and
password, and operate the
module.
Note: If you cannot
download the module’s web
page, it may be that the
address of your network
interface adapter is not set
to a valid IP address within
the module’s default
address domain. Refer to
Applications Note 8500-734
for information on how to
accomplish this.

BusWorks® 993/4EN User’s Manual Modbus TCP/IP Analog Input
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Use up to 20 alphanumeric characters (case sensitive) to specify your
username, and 10 alphanumeric characters (case sensitive) to specify a
password. You will have to type these entries in twice to help prevent errors.
Click the submit button to write your changes to the module.
After completing your username/password changes, click on the appropriate
button at the bottom of the page to select another web page. If you made
changes, you may be prompted to re-enter your new username and
password before being permitted to move to other pages.
After setting your username and password, you can click the “Network
Configuration Page” button, and a screen similar to that shown below will
appear. Use this screen to set the network configuration parameters for
your module (these parameters cannot be set via Modbus registers). You
may have to consult your network administrator to complete the contents of
this page.
WEB BROWSER
Password
Configuration Page
Network Configuration

BusWorks® 993/4EN User’s Manual Modbus TCP/IP Analog Input
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A Static IP Address is as the name implies—static, and represents a unique
fixed IP Address that is generally assigned by your service provider or
system administrator. The Default Mode static IP address assigned to this
module is 128.1.1.100 (refer to product side label).
An IP Address is a unique identification number for any host (this module)
on any TCP/IP network (including the internet). The IP address is made up
of four octets (8 bits), each octet having a value between 0-255 (00H-FFH).
It is expressed here in decimal form, with a period placed between octets.
Note: If you are in Default Mode when you change the IP address noted,
then when you click submit, your unit will leave the default mode and will
assume the new IP address. This will look like you lost communication with
your web browser, but you simply need to change the web browser address
to continue communicating with the unit.
Note: In order to network your PC with an Acromag module, you may have
to consult with your network administrator and either temporarily change the
IP address in your TCP/IP configuration (see TCP/IP Properties of Network
Configuration in Windows), or create a separate private network using a
second network adapter installed in your PC (recommended). This is
because your IP address is likely set to an address that is outside of the
address domain of the unit’s default IP address. The necessary steps for
setting up this interface address will vary with your operating system. Refer
to Acromag Application Note 8500-734, or document 8500-815, for help
accomplishing this (located on the CDROM shipped with your unit or via
download from our web site at www.acromag.com).
The Number of Modbus Sockets refers to the number (1-5) of Modbus
TCP/IP access points to allow for this host. The default allows up to 5
sockets, but you can restrict access by reducing this number.
If this unit were an i2o target device (it has its outputs controlled by another
units inputs), then each i2o message sent to this device will require a socket
and the Number of Sockets must be increased to allow for this.
A socket is a software mechanism that connects an application to a network
protocol (socket is a software object, not a physical object). For example, a
Modbus application program can send and receive TCP/IP messages by
opening a socket and reading and writing data to and from the socket.
On TCP/IP networks, a port is an endpoint to a logical connection (a
connection port) and the way that a client program specifies a specific server
program on a computer network.
For example, a Modbus program will open TCP port 502 to be readable from
other Modbus devices on the network (which also use port 502 to establish a
connection). A port may have more than one socket active at a time and this
server device will allow up to 5 sockets to operate simultaneously over its
contact port 502.
A Subnet Mask is used to subdivide the host portion of the IP address into
two or more subnets. The subnet mask will flag the bits of the IP address
that belong to the network address, and the remaining bits correspond to the
host portion of the address. The unique subnet to which an IP address
refers to is recovered by performing a bitwise AND operation between the IP
address and the mask itself, with the result being the sub-network address.
WEB BROWSER
Network Configuration
This module can be placed
into a default communication
mode via the DFT push-button
at the front of the module. To
activate, hold the DFT button
for 5 seconds. The Status
LED will start a slow blinking to
indicate default mode.
Default Mode uses a static IP
address of “128.1.1.100”, a
default subnet mask of
“255.255.255.0”, a default
username “User”, and a
default password
“password00”.
Note that Acromag Series
9xxEN Ethernet I/O modules
may take up to 15 seconds to
boot upon power-up,
depending on your network
configuration and whether a
DHCP server is present.

BusWorks® 993/4EN User’s Manual Modbus TCP/IP Analog Input
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The Modbus Port Number is set to port 502 by default, which has been
reserved for Modbus applications. Port numbers represents an endpoint or
“channel” for network communications. In this way, every IP address is
divided into many ports, and when one computer sends data to another
computer, it sends the data from a port of an IP address to a port on another
IP address. Any one port can only be used by one program at a time. The
use of port numbers allows different applications on the same computer to
utilize network resources without interfering with one another. For example,
ports make it possible for you to check your email and browse the web at the
same time, because web browsers use port 80, while retrieving your email
uses port 110. The port number could range from 0-99999, but most
popular applications will use port numbers at the low end of this range
already set aside for specific applications (such as 502 for Modbus, or 80 for
HTTP).
Gateway refers to the IP Address of the gateway, if your local area network
happens to be isolated by a gateway. Typically, it is assigned the first host
address in the subnet. If a gateway is not present, then this field should
contain an unused address within the host subnet address range.
A gateway is a device which links dissimilar networks and transfers data
between them at the application layer level. In this way, Gateways
essentially convert messages from one protocol to another.
The Active IP Address refers to the current IP Address being used by this
host, as opposed to any new assignments being made via this page.
The MAC Address refers to the Media Access Control address that uniquely
identifies the MAC hardware of this device. All Ethernet devices have their
own MAC address. This is a unique fixed address that was assigned to the
MAC at its manufacture. It is not to be confused with the dynamically
assigned 32-bit IP Address, commonly denoted as four 8-bit numbers
separated by periods (e.g. 128.1.1.100). Every manufacturer producing
Ethernet hardware, has by assignment, a series of 48-bit addresses to use.
They are restricted to use only the addresses in their series, and only one
time, thus ensuring that no two computers in the world will ever have the
same network address.
An Ethernet packet will include two 48-bit address fields appended to it that
represent the MAC address of the sending computer, and the destination
computer. In IEEE 802 networks, the Data Link Control (DLC) layer of the
OSI Reference Model is divided into two sub-layers: the Logical Link Control
(LLC) layer, and the Media Access Control (MAC) layer. It is the MAC layer
that interfaces directly with the network media and where this address
distinction is applied (each different type of network media requires a
different MAC layer).
Use Static IP Addressing tells this unit to fix the IP address setting to the
Static IP Address specified. By default, the unit is set to use Static IP
Addressing and a Static IP Address of 128.1.1.100.
You can optionally choose to have the IP address assigned dynamically via
DHCP/BOOTP, or DHCP/BOOTP w/Fallbacks. This will also require that
you specify a valid Host Name (see above).
Use DHCP tells the unit its IP address is to be obtained dynamically, and
may change each time this device is connected to the network.
WEB BROWSER
Network Configuration

BusWorks® 993/4EN User’s Manual Modbus TCP/IP Analog Input
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Use DHCP w/ Fallbacks works the same way, but will revert to the static IP
address specified if your DHCP server cannot be found.
DHCP refers to Dynamic Host Configuration Protocol and its routine for
assigning dynamic IP addresses to devices on a network. With dynamic
addressing, a device can have a different IP address every time it connects
to the network, and in some systems, the IP address can even change while
it is still connected.
Click the Submit button to complete any changes made on this page.
Click the Wink On/Off button to toggle the module in/out of “wink” ID mode.
In this mode, the module’s green RUN LED will blink to confirm identification.
The unit includes a default address push-button to cause the module to
assume a fixed default static IP address (128.1.1.100). This button is at the
front of the module and is used to put the module into, or out of Default
Mode. If you use the push-button at the front of the module to place the
module in default mode, then “Default Communications Mode” will be
indicated at the bottom of this screen.
After completing the username & password assignment, plus the network
configuration parameters, use the Input Configuration page to set your input
ranges, rescale inputs, setup integration/totalization, setup floating point
(required for scaling/integration/ totalization), reset the totalizer, and reset the
unit.
WEB BROWSER
Network Configuration
Input Configuration
Page
After completing the username
& password assignment, plus
the network configuration
parameters, use the Input
Configuration page to set your
input ranges, rescale inputs,
setup integration/totalization,
setup floating point (required
for scaling/integration/
totalization), reset the totalizer,
enable/disable scan groups,
and reset the unit.
Once you have carefully made
your selections, click the
“Channel Configuration
Submit” button at the bottom of
the page to activate your
configuration (reconfiguration
takes effect immediately
following “Channel
Configuration Submit”).

BusWorks® 993/4EN User’s Manual Modbus TCP/IP Analog Input
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Use the scroll bars on the right to scroll down the page.
These models have 16 input channels of current (993EN), or voltage
(994EN) input. The Input Configuration page of the 994EN voltage unit is
shown above. The 993EN is identical, except that it refers to current ranges.
Input Configuration (Repeated Per Channel)
You must repeat your reconfiguration for each channel of interest.
Configuration involves first selecting the input channel, its input range, and
optionally rescaling the input’s zero and full-scale value to your own
engineering units. You can also setup an integrator by specifying the scaled
input units and a time base in order to totalize the input. You can
enable/disable totalization of an input, set its preload and initial value, and
reset the totalizer. After you have made your channel specific selections,
click the Channel Configuration Submit button to apply your selections.
993EN Current Input Models
Note: On 993EN models, a current input of ±20mA (22mA maximum) may
be input at the positive or common input lead, but its sign is relative to
current input at the + lead. A precision 200Ωshunt resistor converts 20mA
to 4.0V at the A/D. The A/D has a native ±10V input range configured (16-
bits). The ±20mA input is normalized to a count of ±20000 for ±100% (over-
range is 2000 counts).
Input Range: The current unit utilizes the ±10V A/D input range and is
designed for a unipolar current of 0-20mA. All input ranges are sub-ranges
of the native 16-bit A/D range of ±10V (±20mA into 200Ωis ±4.0V for 14.6
bits of resolution, or 1 part in 26214).
Input Zero (Fixed per Range): Default is same as input range zero (20mA,
0mA, or 4mA) and this cannot be changed. The indicated value will
correspond to 0% of signal and a normalized count of -20000 for ±20mA
range, or 0 for the 0-20mA and 4-20mA ranges.
WEB BROWSER
Input Configuration
For the 994EN, you can select
an input range of ±5V, or
±10V. Each of these ranges
can be rescaled to your own
engineering units.
For the 993EN, all current
input ranges are sub-ranges of
a native ±10V A/D input range,
and utilize a precision 200Ω
input shunt to convert input
current to A/D voltage (±20mA
into 200Ω yields ±4.0V to the
A/D).
Once you have carefully made
your selections, click the
“Submit” button to activate
your reconfiguration
(reconfiguration takes effect
immediately following clicking
“Submit”).
For the 993EN, all current
input ranges are sub-ranges of
the native ±10V A/D input
range and utilize a precision
200Ω input shunt to convert
input current to A/D voltage
±20mA into 200Ω yields ±4.0V
to A/D).

BusWorks® 993/4EN User’s Manual Modbus TCP/IP Analog Input
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993EN Current Input Models…continued
Scaled Zero: Default is the same as input zero (-20mA, 0mA, or 4mA), but
you can rescale this value as required for your application. Field is limited to
a 32-bit number of up to 12 characters and a maximum of 4 decimal places.
For each channel 0-15, enter your rescaled full-scale that is to correspond to
0% of input signal. You must also Enable Floating Point Support to
accomplish rescaling. If you are using only a portion of this range, you may
have to interpolate your scaled zero endpoint.
Input Full-Scale (Fixed per Range): Default is the same full-scale as input
range (+20mA) and this cannot be changed. The full-scale indicated will
correspond to 100% of input signal and a normalized count of +20000.
Scaled Full-Scale: Default is the same as input full-scale (+20mA), but you
can rescale this value as required for your application. Field is limited to a
32-bit number with up to 12 characters and a maximum of 4 decimal places.
For each channel 0-15, enter your rescaled full-scale that is to correspond to
100% of input signal. You must also Enable Floating Point Support to
accomplish rescaling. If you are using only a portion of this range, you may
have to interpolate your scaled full-scale.
Units (5 characters): Enter the units of measure for your rescaled input
zero and full-scale and this is an arbitrary definition used only for reference.
NOTE (993EN): By default, all 993EN current ranges are sub-ranges of a
larger 16-bit ±10V A/D input range. This bipolar input range allows the input
current to be measured in either direction between the channel input and
common terminals. The 993EN employs a 200Ωshunt resistor to convert
the current signal to 4.0V full-scale (0.020A x200Ω). This approximates
14.6-bit of resolution with an A/D resolution of ±13107 parts for ±20mA.
994EN Voltage Input Models
Input Range: Select a 16-bit A/D input range of ±10V, or a 15-bit sub-range
of ±5V.
Input Zero (Fixed per Range):: Default is the same as input range zero
(-5V or -10V) and this cannot be changed. The voltage indicated
corresponds to 0% of signal and a normalized count of -20000.
Scaled Zero: Default is the same as input zero (-5V or -10V), but you can
rescale this value down to a minimum of -999999.0, as required for your
application. Field is limited to a 32-bit number with up to 7 significant digits
and a maximum of 4 decimal places. For each channel 0-15, enter your
rescaled value in engineering units that is to correspond to 0% of input
signal. You must also Enable Floating Point Support to accomplish
rescaling. If you are using only a portion of this range, you may have to
interpolate your scaled zero endpoint.
Input Full-Scale (Fixed per Range): Default is the same as input range
full-scale (+5V or +10V) and this cannot be changed. The voltage indicated
corresponds to 100% of signal and a normalized count of +20000.
Scaled Full-Scale: Default is the same as full-scale (+5V or +10V), but you
can rescale this value up to +999999.0, as required for your application.
Field is limited to a 32-bit number with up to 7 significant digits and a
maximum of 4 decimal places. You must also Enable Floating Point Support
to accomplish rescaling. If you are using only a portion of this range, you
may have to interpolate your scaled full-scale.
Units: For reference, enter the units of measure for your rescaled zero and
full-scale.
WEB BROWSER
Input Configuration

BusWorks® 993/4EN User’s Manual Modbus TCP/IP Analog Input
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Integration/Totalization (Per Channel, Industrial Grade Models Only)
You can optionally integrate an input signal by totalizing its time-sliced
instantaneous value (with integration/totalization enabled at any channel, the
instantaneous inputs of this unit are sampled at a fixed rate of 8ms for all 8
channels, or 20ms with Input Averaging > 1).
Time Base (per Second, per Minute, per Hour, No Application): With
integration/totalization enabled, the instantaneous input is sampled at a
slower rate of every 8ms. You can optionally integrate this signal by
totalizing its time sliced instantaneous value. In order for the totalized value
to accurately accumulate, you need to specify the time-base units of the
input signal to perform the integration over. Select “per Second”, “per
Minute”, “per Hour”, or “NA”. You must specify a time base other than NA
for totalization to occur. Note that if “NA” is selected and Totalize=Yes, then
0.0 is added to the totalized value.
Totalize? & Preload Totalizer: Choose “Yes” for the Totalize? to totalize
the input (this will also automatically enable floating point support). You can
optionally choose to preload a totalized value on power-up or upon system
reset by inserting a number in the Preload Totalizer field. In this way, you
can choose that your post-power/reset preload value be taken from the
Preload Totalizer field, or from the last totalizer value (before power-up or
system reset). During operation, your incremental “time-sliced”
measurement will be added to this total every 8ms. Note that in order
totalize an input, you MUST also Enable Floating Point Support by selecting
“Yes” to that query.
At the End Count of 9999999 (Rollover or Latch?): When your totalized
value reaches the limit of its field, you can click to select Roll Over and
continue totalizing from zero, or restart from the Preload Value, whichever is
selected. Optionally, you can latch the totalized value. Note that if the
added value exceeds the amount required to reach the limit of 9,999,999.0,
the additional amount it is over will be added to the count it rolls over (it
assumes a free running counter and rolls over while ignoring the preload
value).
Note (Counter Operation): This counter is limited to 7 digits of accuracy &
resolution, starting with 4 places before and after the decimal point (see
below). Then, as the count grows beyond the least 7 digits, the least
significant digit is zeroed as the most significant digit is incremented. For
example (note the transitions and digit shift left), the counter starts at
0000.0000 and increments to 0999.9999, then 9999.9990 to 99999.9900,
then 999999.9000 to 9,999,999.0000, then it rolls over or latches as
specified. Thus, while the 4 decimal places will remail visible, their
importance diminishes beyond 7 significant digits. The max counter value is
thus 9,999,999.0.
At Power-Up, Start Totalizer From (Preload or Last Value?): When you
power-up, reset the unit, you can direct the totalization to start from the
Preload value in the Preload Totalizer field, or simply the last totalized value.
Note: A system reset always starts the totalizer from the preload value, or
the last value, whichever is selected here. However, Reset Totalizer always
restarts from the preload value, even if Last Value is selected here.
Channel Configuration Submit: Click this button to submit your channel
configuration selections. Select another channel and repeat this process for
each channel of this unit.
WEB BROWSER
Input Configuration
NOTE: If you are rescaling
the input signal to a sub-range
of the input, you will have to
interpolate the scaled
endpoints to align with the
fixed input zero and full-scale
endpoints indicated.
NOTE: The Totalizer Option is
NOT available on commercial
models.
IMPORTANT: Your effective
resolution will decrease
proportionally as you reduce
the nominal signal span
through rescaling.

BusWorks® 993/4EN User’s Manual Modbus TCP/IP Analog Input
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19
Reset Totalizer: Click this button to reset the current channel’s totalized
value to the Preload Totalizer value.
Totalization Calculation Example
During totalization on this model, an instantaneous input sample is gathered
every 8ms if no input averaging is being done (see table of page 40). If the
instantaneous scaled input value indicates 500, units are gallons, and time
base is set to “per Minute”. Then (500 gallons/minute)*(1 minute/60
seconds) equals a flow rate of 8.33 gallons/per second. Since a new sample
is obtained every 8ms, multiply 8.33gallons/second by 0.008seconds/sample
to get an incremental increase in volume of 0.0667gallons/sample, and this
amount is added to the totalized value. The maximum possible totalized
value is 9,999,999.9999 (12 characters including decimal portion).
Input Averaging (Global, Not Per Channel)
You can optionally specify the number of input samples to average together
to form your input response. Increasing this number will help to filter the
measured response of noisy input signals, but will increase the update time
(to 20ms from 8ms).
Input Averaging: Enter the number of input samples to average together
from 0-300 samples. Selecting 0 is equivalent to selecting 1 and designates
that no averaging will be performed. You may increase this number to help
filter the measured response of noisy input signals.
Note: The Test Page does not display the averaged response.
Floating Point Configuration (Global, Not Per Channel)
Floating Point Control - Enable Floating Point Support (No or Yes)?:
This is normally set to “No” by default, but must be set to “Yes” if you are
rescaling an input, or integrating/totalizing an input. Note that also selecting
“Yes” to the Totalize query for any channel will automatically set this to “Yes”,
but if you later disable floating point, the totalizer will just add 0.0 to the
totalized value. Disable IEEE Floating Point if you are not rescaling,
integrating, or totalizing the input. Selecting “No” to disable floating point
support will reduce the amount of calculations that have to be performed and
gives the processor more time to do other tasks besides acquiring data and
this is recommended when you are also not rescaling or integrating and
totalizing the input. This can help to make critical control network
applications more deterministic, particularly over networks with heavy traffic
flow. Consider that input data is normally acquired every 8ms, or every
20ms if input averaging is greater than 1. Twenty percent of this time is
used to convert the data for all 8 channels, leaving only 80% to process all
the other tasks required to store this data into Modbus registers, run the web
server, and serve this data over the network. You can increase the time
devoted to servicing these other tasks by disabling floating point, effectively
increasing network determinism. So leave it off if you don’t need to rescale
or totalize. Note that even with floating point disabled, the measured input
value will still indicate a floating point number, but the scaling and totalizing
field will indicate “Inactive”.
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