Acromag BusWorks 900EN Series User manual

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BusWorks® 900EN Series –Modbus TCP/IP
10/100M Industrial Ethernet I/O Modules
Model 966EN-4004 Four Channel RTD Input Module
Model 966EN-4006 Six Channel RTD Input Module
USER’S MANUAL
ACROMAG INCORPORATED Tel: [phone]
30765 South Wixom Road Fax: [phone]
Wixom, MI 48393-2417 U.S.A.
Copyright 2003-2014, Acromag, Inc., Printed in the USA.
Data and specifications are subject to change without notice. 8500721J

BusWorks® 966EN Module User’s Manual Modbus TCP/IP RTD Input
__________________________________________________________________
_______________________________________________________________________________________
Acromag, Inc. Tel:[phone] Fax:[phone] Email:[e-mail] http://www.acromag.com
2
IMPORTANT SAFETY CONSIDERATIONS
You must consider the possible negative effects of power, wiring,
component, sensor, or software failure in the design of any type of
control or monitoring 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
MOUNTING AND DIMENSIONS………………………
3
CONTROLS & INDICATORS..…………………………
3
ISOLATION BARRIERS..……………………………….
3
CONNECTIONS………………………………………….
4
DIN-Rail Mounting And Removal………………
4
Network……………………………………………..
4
Power………………………………………………..
6
Analog Inputs……………………………………...
6
Earth Ground..………………………………….….
6
WEB BROWSER………………………………………...
7
Home Page…………………………………………
7
Password Configuration Page.………………...
8
Network Configuration Page……………………
8
I/O Mapping Page (Optional i2o Function)…..
10
Test Page…………………………………………..
12
Calibration Page…………………………………..
13
Input Calibration…………………………………..
15
TROUBLESHOOTING…………………………………..
16
Diagnostics Table……………………………..….
16
Trouble Browsing Your Module?.....................
17
Getting Out Of Trouble…………………………..
17
TECHNICAL REFERENCE
KEY FEATURES…………………………………………
18
HOW IT WORKS………….……………………………..
19
ABOUT MODBUS TCP/IP….…………………………..
20
IP Addressing…………..………………………….
20
Dynamic Host Configuration Protocol………..
22
Domain Name System (DNS)……………………
22
MODBUS REGISTERS…………………………………
22
Register Functions……………………………….
22
Register Mirroring……….………………………..
23
Data Types…………………………………………
24
Register Map………………………………………
25
SPECIFICATIONS……………………………………….
35
Model Numbers….………………………………..
35
Analog Inputs..………………....…………………
35
General Specifications…………………………..
36
Enclosure and Physical………………………….
36
Agency Approvals…..…………………………….
37
Environmental……………………………………..
37
Ethernet Interface…………………………………
38
Controls & Indicators…………………………….
39
ACCESSORY CABLES.……..………………………….
39
REVISION HISTORY……………………………………
42
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.
Windows® is a registered
trademark of Microsoft
Corporation.
!

BusWorks® 966EN Module User’s Manual Modbus TCP/IP RTD Input
___________________________________________________________________
_______________________________________________________________________________________
Acromag, Inc. Tel:[phone] Fax:[phone] Email:[email protected] http://www.acromag.com
3
44 41 36 33
PWR
NETWORK
13
IN0L
16
IN1L
21
IN2+
24
IN3+
TB3
TB1
IN5+ IN4+ GND
IN5-
46 4345
RX
IN4-
35
42
DC-
DC+
32 31
34
TB1
11 1412
IN0+ IN1+
IN0-
TB2
15 22
TX
IN1- IN2-
5V/3V
TB4
2523 26
IN3-
IN2L IN3L
DC
PWR
IN5L IN4L
TB2
ANALOGI/O
RTD INPUTS 4,5
ANALOGI/O
RTD INPUTS 0,1
(966EN-4006ONLY)
ANALOGI/O
RTD INPUTS 2,3
TRANSFORMER
TB3
966EN
ISOLATION
DIAGRAM
TRANSFORMER
TB1
11
46
13
44
14
43
16
41
TB4
21 22 24
33
25
32
IN0+ IN5L
IN0L IN5+
IN1+ IN4L
IN1L IN4+
TB4
IN2+
IN2-
IN3+ GND
IN3- DC-
TB3
C
R S TD FT
LIN K
12
45
TB2
15
42
23 26
31
LA C T
ST
3.75 (95.3)
IN0-
TB1
IN5-
3.90
(99.1)
IN1-
TB2
IN4-
IN2L IN3L
R TD INP U TS 2,3
DC+
P W R
1.05
(26.7)
4.68 (118.9)
RUN
TB3
2.34 (59.4)
"T"RAILDIN MOUNTING
DIN EN 50022, 35mm
E TH E RN E T
R TD INP U TS 0,1
Acromag
R TD INP U TS 4,5
4.35
(110.5)
NOTE: Dimensions AreINCHES (MILLIMETERS).
MODEL966ENENCLOSURE DIMENSIONS
Model 966EN-4006
Model 966EN-4004
(966EN-4006 ONLY)
RST
11
46
12
45
14
43
15
42
22 23 25
32
26
31
ACT
ST
IN0+ IN5L
IN0- IN5-
IN1+ IN4L
IN1- IN4-
TB4
TB2
IN2-
IN2L
IN3- DC-
IN3L DC+
LINK
TB1
13 16
44 41
21 24
33
TB1
IN0L IN1L
IN5+ IN4+
TB4
RTD INPUTS 2,3
IN2+ IN3+
PWR
GND
TB3
TB3
ETHERNET
DFT
RUN
TB2
(PLUG-INTYPE)
TERMINALBLOCKS
RJ45ETHERNET
CONNECTOR
ETHERNETACTIVITY
LED(YELLOW)AND
LINKLED(GREEN)
Acromag
RUN/PWRLED(GREEN)
REMOVABLE
RESET/DEFADDRESS
TOGGLESWITCH:
TOGGLERIGHTTORESET
TOGGLELEFTTOSET
DEFAULTADDRESS
MODULE STATUS
LED(YELLOW)
RTD INPUTS 4,5
RTD INPUTS 0,1
(966EN-4006ONLY)
The toggle switch is used to toggle the module into or out of Default Mode
(toggle left), or to reset the module (toggle right). In Default Communication
Mode, the yellow ST LED blinks slowly and 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”.
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
if module is in default mode
and stays ON if an input is out
of range.
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 input circuit, network, and
power circuit are isolated from
each other for safety and noise
immunity.

BusWorks® 966EN Module User’s Manual Modbus TCP/IP RTD Input
__________________________________________________________________
_______________________________________________________________________________________
Acromag, Inc. Tel:[phone] Fax:[phone] Email:[e-mail] http://www.acromag.com
4
45 44 42 41 33
DC+
31
12 13 15 16 21 23 24 26
TB1
GND
46 43
PWR
DC-
32
11 14 22
TB4
25
TB3TB3
PUSH
TB2
"T" TYPE
DIN RAIL
Any Series 9XXEN Ethernet Module
PUSH SCREWDRIVER AS SHOWN
TO TILT AND LIFT MODULE OFF RAIL
Remove Terminal Blocks On This
Side To Provide Clearance
MODULEREMOVAL
FROM DIN RAIL
PRY WITH 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
1
8
7
5
4
2
1
100M
100M
CLIP
8
6
3
CABLE
8
1
10Base-T CAT 5/5eUTP/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 5 UTP/STP
NoteCrossoverConnections
MINIMUMRECOMMENDEDCABLE
Not Used
Not Used
Not Used
Not Used
Transmit -
Transmit + ETHERNET PORT
RJ45 MDI ANDMDI-X CONNECTIONS
Receive-
Receive+
MDI WIRING
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 module is wired MDI and does not include
automatic crossover. The Ethernet port of your PC is also wired MDI and
may not include automatic crossover. As such, you must use a crossover
cable like that shown below when connecting this device directly to a PC.
1
1
3
6
1
6
2
3
1
8
281
8
8
1
PINS: 1TO3
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
CONNECTIONS
DIN-Rail
Mounting & Removal
Network
For 100Base-TX systems, use
data grade Unshielded
Twisted-Pair (UTP) wiring that
has a 100Ω characteristic
impedance and meets the
EIA/TIA Category Five wire
specifications.
It is recommended that you
use a crossover CAT-5 cable
to connect this device to your
PC.
For 10Base-T systems, you
may use Category 3, Category
4, or Category 5 UTP cable.
In either case, you are limited
to 100 meters between any
two devices.
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® 966EN Module User’s Manual Modbus TCP/IP RTD Input
___________________________________________________________________
_______________________________________________________________________________________
Acromag, Inc. Tel:[phone] Fax:[phone] Email:[email protected] http://www.acromag.com
5
ST
D FTR S T
LINK
RUN
E THE R N E T
A C T
Acromag
HOST PC
(UseCrossoverCable)
AcromagCrossoverCableModel 5035-360
CAT-5UTP/STP CABLE
UP TO100 METERS
HOST PCCONNECTEDDIRECTLYTOAMODULE
Note: This MDI-to-MDI connection requires the useof a crossovercable. Acromag966EN-4006 or966EN-4004
Ethernet Module.
The ethernet port of these
modules is not automatic
MDI/MDI-Xcrossover
andis wiredMDI.
S1 S2
DC-
33
DC+
32
RS
109
65
21 3
98
54
10
DA
11
7
2 3
ST
8
4
0
10
76
2 3
ST
98
54
10
DA
11
7
2 3
ST
100M
LK /
P1
X3 X4
TB 3
CH. I / O STATUS
ACT
ACT
CH. I / O STATUS
RUN
X5
X5
X4
X1
GND
34
DC+
31
8
4
0
RUN
DA
LI NK
11
7
ST
LI NK
10
6
DARS
LI NK
911
5
1
RS
LI NK
10
6
RUN
COL
ACT
X5
X3
X2
X1 X2
PG M
PO RT
PUSH TO RESET
ACT
ACT
ETHERNET
Ac ro m a g
CH. I / O STATUS
CH. I / O STATUS
PO WER
RS
RUN
RUN
ETHERNET
SW I TCH
Ac ro m a g
ETHERNET
ETHERNET
Ac ro m a g
Ac ro m a g
ETHERNET
Ac ro m a g
HOSTPC
Acromag9xxEN-4012
Ethernet Modules.
Theethernet portofthese
modulesarenotautomatic
MDI/MDI-X crossover, but
theuseofanauto-crossing
switcheliminatestheneed
tomakeadistinctionbetween
straight-throughandcrossover
cables.
(Straight-ThroughorCrossoverCable)
CAT-5UTP CABLE
UP TO100METERS
(Straight-ThroughorCrossoverCable)
OrderAcromagCableModel 5035-355
CAT-5UTP CABLE
UP TO100METERS
ETHERNET
SWITCH
DI P SW S1/ S2
CFG O PTIO NS
CAT-5UTP CABLE
UP TO100METERS
(Straight-ThroughorCrossoverCable)
(Straight-ThroughorCrossoverCable)
CAT-5UTP CABLE
UP TO100METERS
CAT-5UTP CABLE
UP TO100METERS
Theethernet portofthePCis
generallynotautomaticMDI/MDI-X
crossoverandiswiredMDI.
BecausetheAcromagethernetswitch
900EN-S005isautomaticMDI/MDI-X
crossover,useofadirect(straight-through)
orcrossovercableispermissible.
IMPORTANT: IFTHE HOSTPC CONNECTS DIRECTLY TOTHE MODULE,
YOU MUSTUSE ACROSS-CONNECTCABLE (MDI-X),AS BOTHTHE PC
ANDTHE 9XXEN MODULE ETHERNETPORTS ARE WIREDMDI.
ETHERNETSWITCHES AND HUBS ARE WIREDMDI-X.
THE ACROMAGETHERNETSWITCHIS AUTOMATIC MDI/MDI-X AND
ELIMINATES THE NEED FOR MAKINGA DISTINCTION BETWEEN
THE USE OFSTRAIGHT-THROUGH (MDI)ANDCROSSOVER (MDI-X)
CABLE CONNECTIONS.
Acromag900EN-S005
5-PortEthernetSwitch
orequivalent.
Theethernet portsofthis
switchareautomaticMDI/MDI-X
crossinganddonotrequire
crossovercables.
USE OF AN ETHERNET SWITCH TO NETWORK
A HOST PC TO MORE THAN ONE MODULE
Acromag offers a straight-through patch cable (Model 5035-355), or a
crossover cable (Model 5035-360) for use with Series 9xxEN modules.
Refer to the section “Cable Accessories” 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.
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 the switch.
CONNECTIONS
Network

BusWorks® 966EN Module User’s Manual Modbus TCP/IP RTD Input
__________________________________________________________________
_______________________________________________________________________________________
Acromag, Inc. Tel:[phone] Fax:[phone] Email:[e-mail] http://www.acromag.com
6
33 31
DC+
32
DC-
PWR
+
TB3
GND
TB3 INPUT POWER
IS ISOLATED
EARTH
GROUND
15 TO 36VDC
✓Connect 15-36V 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.
Note that earth ground is connected
to the GND terminal as shown at
left and is not connected to the
inputs.
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).
✓Connect analog input signals to the input terminals as shown below
according to your model. Note earth ground.
TB1
14 11
16 1315
IN1-
TB1
12
IN0-
RTD INPUTS 0,1
RTD INPUTS 0,1
RTD INPUTS 0,1 RTD INPUTS 0,1
14
IN1+
11
IN0+
14
IN1+
11
IN0+
IN1-
IN1+
IN0-
IN0+
NOTE1
DONOT
GROUND
EARTH
GROUND
TB1
16
IN1L
13
IN0L
TB1
15
IN1-
12
IN0-
NOTE1 EARTH
GROUND
R
R
JUMP
TB1
16
IN1L
13
IN0L
TB1
15
IN1-
12
IN0-
IN1L
IN0L
TB1
TB1
15
IN1+
14 12
IN0+
11
JUMP
RESISTANCE
DECADEBOX
JUMPER [IN-] TO [INL] FOR
RESISTANCE BOX OR 2-WIRE
RESISTANCEINPUT
3-WIRERTD
DO NOT LEAVE UNUSED
INPUTS FLOATING
UNUSEDINPUTS
IMPORTANT: RTD INPUTS ARE NOT
ISOLATED CHANNEL TO CHANNEL
IN1L
IN0L
16 13
DONOT
GROUND
2-WIRERTD
TERMINATE UNUSED
INPUT CHANNELS
JUMPER [IN-] TO [INL]
FOR 2-WIRE RTD
NOTE 1: DO NOT APPLY EARTH GROUND TO INPUT LEADS OR INPUT
TERMINALS. EARTH GROUND SHOULD INSTEAD BE APPLIED AT THE
INPUT LOGIC GROUND TERMINAL (GND AT TB3-33).
✓Connect Earth Ground as shown in the connection drawings above.
Additionally, connect the GND terminal (TB3-33) 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.
The plastic module housing does not require earth ground.
CONNECTIONS
Power
Voltage
Current
15VDC
125mA
18VDC
105mA
24VDC
80mA
36VDC
59mA
CAUTION: Risk of Electric
Shock –More than one
disconnect switch may be
required to de-energize this
equipment before servicing.
Analog Inputs
Input is Cu, Pt, or Ni RTD, or
linear resistance, connected in
2-wire, or 3-wire fashion.
Inputs are not isolated
channel-to-channel.
Unused inputs should be
terminated and not left floating.
For 2-wire connections, be
sure to jumper the IN- and
INL leads together.
Do NOT attach earth ground
to any input leads. Earth
ground should instead be
connected to the GND
terminal at TB3-33.
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 hurt
performance.

BusWorks® 966EN Module User’s Manual Modbus TCP/IP RTD Input
___________________________________________________________________
_______________________________________________________________________________________
Acromag, Inc. Tel:[phone] Fax:[phone] Email:[email protected] http://www.acromag.com
7
This module supports Modbus over TCP/IP. You may use your own
software to issue Modbus command to this module (see Modbus Registers),
or you may use a web browser to achieve basic functionality, as the 966EN
modules have built-in web pages that allow you to setup, control/test, and
calibrate 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:
The Home Page provides buttons to access the other web pages of this
module that are used to configure network parameters, change the user
name and password, calibrate the module, map inputs to outputs, and
operate/test the module.
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 below. 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 the defaults, you may wish to invoke the
Password Configuration Page to change these parameters to something
more meaningful to you. Note that these entries are case-sensitive.
IMPORTANT: If you forget your user
name & password, you can always
toggle the module into default mode
via the default mode toggle switch at
the front of the module. Then the
password and username will revert to
the original defaults noted above,
allowing you to re-invoke the
Password Configuration Page and
change the username and password
settings as required.
WEB BROWSER
Home Page

BusWorks® 966EN Module User’s Manual Modbus TCP/IP RTD Input
__________________________________________________________________
_______________________________________________________________________________________
Acromag, Inc. Tel:[phone] Fax:[phone] Email:[e-mail] http://www.acromag.com
8
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 to set the network configuration parameters for
the module. You may have to consult your network administrator for help to
complete the contents of this page.
WEB BROWSER
Password
Configuration Page
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 in these entries twice to
help prevent errors (yes, I
know this is annoying).
Click the submit button to
write your changes to the
module.
Network Configuration

BusWorks® 966EN Module User’s Manual Modbus TCP/IP RTD Input
___________________________________________________________________
_______________________________________________________________________________________
Acromag, Inc. Tel:[phone] Fax:[phone] Email:[email protected] http://www.acromag.com
9
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.
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 static IP address assigned to this module
from the factory is 128.1.1.100 (refer to product side label).
NOTE: In order to network your PC with an Acromag module, you may have
to consult with your network administrator and either temporarily change
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). The necessary steps will vary
with your operating system. Refer to Acromag Application Note 8500-734 to
help accomplish this (located on the CDROM shipped with your module or
via download from our web site at www.acromag.com).
The Number of Sockets refers to the number (1-10) of Modbus TCP/IP
access points to allow for this host. The default allows up to 10 sockets, but
you can restrict access by reducing this number. Internally, the module uses
port number 502, which is reserved for Modbus.
The DNS Server refers to the IP address of the Domain Name Server used
on this network. A DNS server relates symbolic names to actual IP
addresses, while the DHCP server is responsible for dynamically passing out
IP addresses.
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.
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.
The Host Name is the name to be assigned to this host if its address
happens to be assigned dynamically using DHCP.
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 hardware of this device. This is a unique fixed
address assigned to this module at the factory. On IEEE 802 networks, the
Data Link Control (DLC) layer of the OSI Reference Model is divided into two
sublayers: the Logical Link Control (LLC) layer, and the Media Access
Control (MAC) layer. The MAC layer interfaces directly with the network
media (each different type of network media requires a different MAC layer).
WEB BROWSER
Network Configuration
Note that Acromag Series
9xxEN Ethernet I/O modules
may take from 3-30 seconds to
boot upon power-up,
depending on your network
configuration and whether a
DHCP server is present.
This module can be placed
into a default communication
mode via the DFT toggle
switch at the front of the
module.
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”.

BusWorks® 966EN Module User’s Manual Modbus TCP/IP RTD Input
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By default, the module is setup 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/Fallback. This
will also require that you specify a valid Host Name. Note that DHCP/
BOOTP w/Fallback will revert to the static IP address if your DHCP or
BOOTP server cannot be found at the address specified.
In general, BOOTP (Bootstrap Protocol) refers to an internet protocol that
enables a diskless workstation to discover its own IP address, the address of
a BOOTP server on the network, and a file to be loaded into memory to boot
the machine. This enables the workstation or device server to boot without
requiring a hard or floppy disk drive. BOOTP works similar to DHCP, but is
usually found in older systems. This protocol is defined by RFC 951.
DHCP (Dynamic Host Configuration Protocol) refers to a protocol 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. In some systems, it can even change while it is still
connected. DHCP also supports a combination of static and dynamic IP
addresses. DHCP/BOOTP with fallback will revert to static IP addressing if
the DHCP or BOOTP server cannot be found.
The unit includes a default address toggle switch to cause the module to
assume a fixed default static IP address (128.1.1.100). This switch is at the
front of the module and is used to toggle the module into, or out of Default
Mode. If you use the toggle switch 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.
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
as an aide to locating a specific module on a network.
Refer to the Technical Reference section of this manual to learn more about
IP Addressing terms and concepts.
This module includes special messaging functionality (i2o, input-to-output
communication) that allows it to send its input level to an output channel on
an Acromag 972EN-400x or 973EN-400x analog output module. The I/O
Mapping page is used to specify the static IP address of the 972/973EN
module to send input data to, the specific Holding Register address of that
module (which channel), an update rate, and to set the scaling.
IMPORTANT: This module is designed to function as a Modbus TCP/IP
slave/server. Normally, Modbus servers are not allowed to initiate messages
on their own and may only respond to client/master requests. The I/O
mapping function is a special application that may cause confusion for
master/client devices linked to the same network. Other master devices
should be restricted from attempting to control i2o target devices.
WEB BROWSER
Network Configuration
I/O Mapping Page
(Optional i2o Function)

BusWorks® 966EN Module User’s Manual Modbus TCP/IP RTD Input
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Each input channel of this device may be mapped to one or two output
channels of Acromag 972EN-400x (current output), or 973EN-400x (voltage
output) modules. The output channel that is to be controlled in this manner
is determined by the Map-To Holding Register address specified. The data
written will be scaled to percent-of-span units. Subsequent messages will be
sent at a periodic rate specified via the update time. Note that the target
output channels may still be controlled independently, but their level will be
overwritten by subsequent mapped messages when enabled.
You can map each input channel to one or two analog output channels of
another 972EN or 973EN module. The Map To Holding Register
determines the output channel it will map to. Since the input signal is in
wide-range engineering units, you must also specify the scaling between the
input units and 0-100% at the output channel.
Update Time: Specify a time from 0-90 seconds between messages.
Specify 0 to turn mapped messaging OFF.
Map To IP Address: This is the Static IP Address of the target output
device (a 972/973EN module on the network).
Map To Holding Register Address: Specify a valid 4xxxx holding register
address in the target device for writing to the output. For the 972/973EN,
only addresses 40019 to 40024 will apply and correspond to channels 0-5.
Input Scaling: Since the input signal is in engineering units and wide-
range, you must select which portion of the input range will map to 0% and
100% at the output.
WEB BROWSER
I/O Mapping Page
(Optional i2o Function)
This messaging function works
best if the target module(s) are
already online and ready to
receive messages. It will still
work if the target output
modules come online after the
input module, but may take
several minutes to “discover”
all the network targets and
begin transmitting to them.
If the input module or the
target module(s) go offline,
remote messaging will resume
on its own when the
connection is re-established,
but this “healing” function may
take several minutes
depending on which device(s)
went offline, why, and for how
long.
Note: Remote messaging
may only be configured via the
built-in web browser page as
there are no Modbus registers
for specifying these
parameters.
The actual data written to the
analog output is rescaled to
percent-of-span units (a 16-bit
signed integer value with
resolution of 0.005%/lsb). For
example, -100%, 0% & +100%
output will be represented by
the decimal values –20000, 0,
and 20000, respectively.

BusWorks® 966EN Module User’s Manual Modbus TCP/IP RTD Input
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After completing your username/password assignment, plus your network
configuration, you can use the Test Page to operate your module. The Test
Page will allow you to read inputs, change input ranges, and set the lead
break detect direction for this model.
WEB BROWSER
Test Page
TIP: Viewing a module’s web
page is treated similar to
viewing a web page on the
internet. The first time you
open a page, its image is
stored as a temporary internet
file in PC memory. However,
each subsequent attempt to
view that page will need to
automatically update that
image, especially when
making configuration changes.
With Internet Explorer, click
the “Internet Options” of the
“Tools” menu, select the
“General” tab, locate the
“Temporary Internet Files”
information and click on the
“Settings” button. Then select
“Automatically” under “Check
for newer versions of stored
pages:”. Then click [OK] to
return to the “General” screen,
and click [OK] again to save
your settings.
Use the scroll bar on the right
to scroll down the page as
shown at left.
Note that the 4 or 6 channels
of these modules are divided
into 2 or 3 pairs of channels
(ports). Channels of the same
port must share the same
input range configuration, but
the configuration may vary
between the three ports.

BusWorks® 966EN Module User’s Manual Modbus TCP/IP RTD Input
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IMPORTANT: The input signal indicated only reflects the level of the inputs
at the moment this screen is invoked and this does not continuously update.
You can click your browser’s refresh button to get a new input update.
You can also use the Configuration Control of this page to change the input
range for each port or channel pair (0/1, 2/3, or 4/5). For the 966EN shown,
you may select from 5 ranges in 2-wire and 3-wire configurations. Note that
your range selection will apply to both channels of the port. Click on “submit”
to execute your range change.
Note (Lead Break): Internally, RTD values are represented via 16-bit
signed integers with a resolution of 0.1C/lsb and a possible range of –
3276.8C to +3276.7C. As such, a count of 0-7FFFH is a positive number,
while 8000-FFFFH is a negative number. However, the upscale/downscale
break counts are trimmed to a reasonable range value according to the RTD
type. The downscale (break) detent is 63105 (Pt385), 63141 (Pt391), 63715
(Ni), and 63281 (Cu). The upscale break detent is 12618 (Pt385), 12421
(Pt391), 3455 (Ni), and 32767 (Cu).
The Calibration Page will allow you to recalibrate each channel’s zero and
span signal as required. Simply select the channel to be calibrated, choose
zero or span, apply the zero or full-scale signal to the input, then click
calibrate. For best results, always calibrate zero before span.
Note that if calibration has been done improperly at any input, you may click
on the Restore Factory Calibration button to return the module to its
original factory calibration for all channels.
Use the scroll bar on the right to scroll down the page as shown below:
WEB BROWSER
Test Page
Calibration Page
IMPORTANT: This module
has already been calibrated at
the factory and recalibration is
not normally required, except
as necessary to correct for
long term component aging, or
to satisfy your company’s
maintenance requirements.
Do not attempt to recalibrate
this module unless absolutely
required, as miscalibration will
negatively affect the module’s
performance.

BusWorks® 966EN Module User’s Manual Modbus TCP/IP RTD Input
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_______________________________________________________________________________________
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If recalibration of any input is required, all applicable ranges should be done.
The following table gives the calibration values for the input ranges of these
models. These are the specific input signals required to calibrate the range
endpoints.
Your success in recalibrating the input will strongly depend upon the
accuracy and precision of your signal source.
For the 966EN, when you calibrate the 0-500 ohm range, the Pt385, Pt391,
and Nickel ranges are automatically interpolated and calibrated at the same
time (their ideal calibration points are shown in the table for reference). The
Copper range must be calibrated separately.
INPUT RANGE
LO Calibration
HI Calibration
Cu 10Ω (-200 to +260ºC), α=1.4272
0°C (9.04Ω)
250°C (18.73Ω)
0-500Ω Linear Resistance, α=1.000
10.00Ω
450.00Ω
Pt 100Ω (-200 to +850ºC), α=1.3850
0°C (100Ω)
850°C (390.48Ω)
Pt 100Ω (-200 to +850ºC), α=1.3911
0°C (100Ω)
850°C (395.12Ω)
Ni 120Ω (-80 to +320ºC), α=1.6720
0°C (120Ω)
300°C (439.44Ω)
Note: The platinum and nickel calibration points are derived from the 0-
500Ω range endpoints.
IMPORTANT: For best results, be sure to use a precision resistance source
or RTD calibrator capable of reproducing nominal endpoint signals at least
as accurate as the module itself (better than ±0.1% of span). Select 2-wire
or 3-wire according to your final application. Further, allow the module to
warm up a few minutes prior to calibration.
WEB BROWSER
Calibration Page

BusWorks® 966EN Module User’s Manual Modbus TCP/IP RTD Input
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15
The unit supports separate calibration for both 3-wire and 2-wire
configurations. Calibrate the unit using the wiring configuration required by
your application.
Method 1 –Calibration Using The Built-In Browser Interface:
1. Make sure that the range that needs calibrating is currently selected.
2. Bring up browser interface and select calibration page.
3. Apply either the zero or span input signal to the channel to be calibrated.
Calibrate the zero endpoint signal first, the span endpoint signal second.
4. Wait about 10 seconds for the input to settle and be read.
5. Click on the channel number and select either zero or span calibration.
6. Click on the “Calibrate” button. The page will refresh and calibration may
continue. Repeat this process for the other endpoint (span).
7. Repeat steps 2-5 for the other input channels to be calibrated.
8. Repeat steps 1-7 for the other input ranges, as required.
Method 2 –Calibration Via The Modbus TCP/IP Interface:
1. Write to the appropriate Port Input Range Register to select the input
range to be calibrated for your channel(s) of interest.
2. Write 24106 (5E2AH) into the Calibration Access Register to remove
write protection from the calibration registers.
3. Apply the zero calibration signal (Cal Lo, see table) to the input to be
calibrated and allow the input to settle about 10 seconds.
4. Write a 16-bit value to the Zero Calibration Register with a set bit in the
bit position that corresponds to the channel number to be calibrated (one
channel at a time). If you were calibrating the zero of channel 5, you
would write 0x0010 to the Zero Calibration Register. The module will
replace calibration coefficients immediately, no reset needed.
5. Apply the full-scale calibration signal (Cal Hi, see table) to the input to be
calibrated and allow the input to settle about 10 seconds.
6. Write a 16-bit value to the Span Calibration Register with a set bit in the
bit position that corresponds to the channel number of the channel to be
calibrated (one channel at a time). For example, if you wanted to
calibrate the span of channel 0, write 0x0001 to the “Span Cal Register”.
7. Write to the Port Input Range Register to select the next range to be
calibrated for this channel. Repeat steps 3-6 for the next range as
required.
8. Repeat steps 3-7 for the other channels as required.
9. When finished calibrating, write 0x0000 to the Calibration Access
Register (Holding register 21) to replace write protection to the
calibration registers and prevent miscalibration.
WEB BROWSER
Input Calibration
You can choose to use the
web browser calibration page
to accomplish calibration as
described at right in Method 1
(easiest), or via direct register
access using your own
software as described in
Method 2.

BusWorks® 966EN Module User’s Manual Modbus TCP/IP RTD Input
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Upon power-up, the green RUN LED should light. A continuous blinking Run
LED indicates “wink” ID mode. If the Run LED remains OFF and correct
power has been applied, then either the internal power supply has failed or a
fatal processor error (firmware) has occurred.
SYMPTOM
POSSIBLE CAUSE
POSSIBLE FIX
Green RUN LED
does not light.
Internal +3.3V power
has failed.
Return module for repair.
Continuous flashing
green RUN LED.
Module in “wink”
mode.
Read Module Status register
to verify “wink” status. Write
5555H to Wink Mode
Toggle Register to toggle
wink mode off/on.
Cannot
communicate.
Power ON at the
module?
Check power. Is green
RUN LED ON?
Connecting cable is
not a crossover
cable.
TIP: To check cable
type, hold both ends
in same position and
read the wire colors
through the clear
portion of the plug
from left to right. If
colors are arranged in
the same order, you
have a straight cable.
This module’s Ethernet port
is wired MDI. You must use
a crossover cable when
connecting this module to
your PC or another device
also wired MDI. If you are
connecting to an Ethernet
switch or hub, then a direct
cable is used.
Note: If your Link LED is
ON, you have connected
using the correct type of
cable, but it could still be
defective.
Wrong IP Address
Change the IP address of
the module or the PC so
that both match. Try the
default module address of
128.1.1.100. For the PC
NIC, try another node
address.
Many
Communication
Errors.
Is cable segment
longer than 100M?
Maximum distance between
two nodes is limited to 100
meters using approved
cable.
Correct Cable?
Shielded CAT-5/5E cable or
equivalent is recommended.
Missing earth ground
connection.
Connect earth ground to
TB3-33 GND terminal
adjacent to power terminal.
Cannot Browse
Module.
Your browser may be
setup to use a proxy
server for LAN
communications.
Temporarily disable the use
of a proxy server by your
browser (see procedure of
next page).
TROUBLE-
SHOOTING
Diagnostics Table
If your problem still exists after
checking your wiring and
reviewing this information, or if
other evidence points to
another problem with the unit,
an effective and convenient
fault diagnosis method is to
exchange the module with a
known good unit. Acromag’s
Application Engineers can
provide further technical
assistance if required.
Complete repair services are
also available from Acromag.

BusWorks® 966EN Module User’s Manual Modbus TCP/IP RTD Input
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_______________________________________________________________________________________
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17
Please refer Acromag Application Note 8500-734 for help in setting up
network communication with your module (located on the CDROM shipped
with your module or via download from our web site at www.acromag.com).
This document gives details for changing your PC’s TCP/IP configuration in
order to communicate with your module (see TCP/IP Properties of Network
Configuration in Windows).
If you have carefully followed this procedure and you still cannot browse your
module, you may have the web browser of your laptop or PC setup to use a
proxy server when browsing the web. If you are using Internet Explorer,
Refer to the “Tools” pulldown menu, select “Internet options…”, click the
“Connections” tab, then click the “LAN Settings” button. Locate the Proxy
server information and uncheck the box next to the statement “Use a proxy
server for your LAN”. Then click [OK] to return to the “Connections” screen,
and click [OK] again to save your settings.
You should now be able to use Internet Explorer to browse the module as
required. However, to later restore your PC’s connection to your company
network, you may have to re-enable the use of a proxy server for your LAN.
There is no built-in error detection to prevent you from writing invalid values
to a configuration register. As such, if you inadvertently write an invalid value
to an internal register, you could cause the module to become inoperable
under certain conditions. If this happens, in order to regain control of the
module, the module can either be re-downloaded at the factory, or you can
try restoring the module to its initial configuration by following this procedure:
Procedure For Restoring any 9xxEN Module to its Initial Configuration
1. While module power is OFF, press and hold the front-panel toggle
switch in the default (DFT left) position.
2. While continuing to hold the toggle switch in the default position, apply
power to the module.
3. After a few seconds, the Status LED will begin to blink quickly and you
can release the default switch at this point. The module will continue to
boot itself as it normally does. That is, the green RUN LED will blink for
1-10 seconds as the unit acquires its address, then remain ON for
normal operation.
4. If the STATUS LED fails to blink rapidly after a few seconds and the
RUN LED just blinks for a few moments as it normally does, then
reinitializing the module has failed and you should try it again. This
time, make sure that the DFT switch is completely depressed and held
while powering the unit. Also make sure that you are pressing the DFT
toggle in the DFT direction (left), rather than the RST direction (right).
TROUBLE-
SHOOTING
Trouble Browsing Your
Module?
Getting Out Of Trouble
So, your module’s “gone wild”,
follow this procedure to restore
it to its initial configuration and
regain control.

BusWorks® 966EN Module User’s Manual Modbus TCP/IP RTD Input
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18
TECHNICAL REFERENCE
•Safety Agency Approvals –CE, UL, & cUL listed, plus Class I; Division
2; Groups A, B, C, D approval.
•Fully Isolated –Input channels (as a group), network, and power are all
isolated from each other for safety and increased noise immunity.
•Modbus TCP/IP Protocol Support –Supports up to 10 master sockets
(maximum number is user-selectable) using port number 502 (Modbus
TCP/IP Default).
•I/O Mapping (i2o) Feature –Allows the analog inputs of these models
to map their values to the analog outputs of 972EN-4006 or 973EN-4006
modules on the network.
•Built-In Web Pages –Allows unit to optionally be configured, controlled,
calibrated, and monitored via a standard web browser over Ethernet.
•Convenient “Wink” ID Mode Support –Blinks green RUN LED in wink
mode as a visual tool to help identify specific remote units on a network.
•Fully Independent w/ Direct I/O Connection –Self-contained with no
special bus couplers, power supply, or rack mount required to operate.
•Isolated Network Interface –Immune to noise & can operate over long
distances. Allows many modules to network together. RJ45 port
includes transient protection from ESD, EFT, and other transients.
•10Base-T and 100Base-TX Support –Integrated IEEE 802.3/802.3u
100Base-TX/10Base-T.
•Auto-Negotiated 10/100Mbps, Half or Full Duplex.
•Flexible Quad or Hex RTD Inputs –Accepts four or six channels of
input for Platinum (Pt), Copper (Cu), and Nickel (Ni) RTD types, or
simple resistance. RTD’s are connected in 2 or 3 wire fashion.
Linearization, excitation, lead break detection, and lead-wire
compensation (3-wire) are included.
•Ratiometric Differential RTD Sampling –The RTD is sampled
differentially using ratiometric conversion and this increases accuracy.
•Automatic Self-Calibration –Built-in self-calibration helps correct for
temperature drift of the input circuit every 60 seconds.
•Upscale Or Downscale Break Detection –Inputs may be configured to
go upscale or downscale upon lead breakage.
•Precise High-Resolution A/D Conversion –Modules use high-
resolution, low noise, sigma-delta analog-to-digital conversion for high
accuracy and reliability.
•Plug-In Terminal Blocks & DIN-Rail Mount –Make mounting,
removal, and replacement easy.
•Nonvolatile Reprogrammable Memory –Allows the functionality of this
device to be reliably reprogrammed thousands of times.
•Operation/Diagnostic LED Indicators Aide Troubleshooting –Yellow
ACT LED indicates port activity. Green LNK LED indicates link (auto-
negotiation complete and connection established). Green RUN LED
indicates power/wink ID mode. Yellow ST LED indicates module status.
•Internal Watchdog - A hardware watchdog timer is built into the
microcontroller that causes it to initiate a self reset if the controller ever
“locks up” or fails to return from an operation in a timely manner.
•Wide-Range DC-Power –Wide range diode-coupled for use with
redundant supplies, and/or battery back-up.
•Hardened For Harsh Environments –For protection from RFI, EMI,
ESD, EFT, & surges. Has low radiated emissions per CE requirements.
•Wide Ambient Operation –Reliable over a wide temperature range.
KEY FEATURES

BusWorks® 966EN Module User’s Manual Modbus TCP/IP RTD Input
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19
2+
1+
2-
8
5
2
1-
2-
2+
1-
2+
1+
1-
4
1
6
3
2-
1+ 7
R+
RJ45
R+
R+
+3.3V RTC
5V
+3.3V
+3.3V
+3.3V
ISOLATED
FLYBACK
SWITCHER
GND
STA ACT
+6V
LINK
P
O
W
E
R
A/D#3
A/D#2
I/OPOWER
TOGGLESWITCH
MICRO
CONTROLLER
MICRO
CONTROLLER
+3.3V +3.3V +3.3V
DC+
DC-
100
EARTH
GROUND
GND
A/D#1
I/OLOGIC
POWER
RUN
3.3V
EARTH GROUND
EthernetPortIncludes
ESD Protection
ISOLATED INPUTPOWER
SRAM
(512Kx8)
ISOLATED ETHERNET
15-36VDC
FLASH
(512Kx8)
ETHERNET
CONTROLLER
These input modules will process up to four or six RTD input signals,
according to model number, and provide an isolated 10/100 Ethernet
interface for configuration, monitoring, and control of the input module. One
A/D is provided for every pair of input channels and each input drives a
separate A/D channel. An integrated multiplexer and analog switch are used
to connect each of two A/D input channels to the A/D converter. The A/D
converter then applies appropriate gain to the signals, performs analog-to-
digital conversion, and digitally filters the signals. The digitized A/D signal is
then transmitted serially to a microcontroller. The microcontroller completes
the transfer function according to the input type/range per its embedded
program. Configuration and calibration parameters are stored in non-volatile
memory integrated within the microcontroller. A dedicated Ethernet
controller handles Ethernet communication. The I/O terminals and the
Ethernet port terminals also include transient suppression. A wide input
switching regulator (isolated flyback) provides isolated power to the I/O
circuits and the Ethernet controller. Refer to the simplified schematic shown
below to help gain a better understanding of the circuit.
Note that input types may vary between channel pairs, but pair members
share the same input range configuration—channel 0 and 1 may be
configured differently from channel 2 and 3, and channel 4 and 5. All inputs
share the same break detect direction, upscale or downscale. Inputs are not
isolated channel-to-channel.
HOW IT WORKS