Allen-Bradley ControlLogix DeviceNet 1756-DNB User manual

Publication 1756-IN566B-EN-P - April 2001
Installation Instructions
ControlLogix DeviceNet
Scanner Module
Catalog Number 1756-DNB
Use this manual as a guide to install the ControlLogix™ DeviceNet™
Scanner Module. The following table identifies what this manual
contains and where to find specific information.
Topic See Page
European Communities (EC) Directive Compliance 3
Preventing Electrostatic Discharge 4
Understand the Module’s Software Features 5
Identify Module Components 6
Prepare to Install the Module 7
Installing or Removing the Module Under Power 8
Determine Module Slot Location 9
Install the Module 10
Remove or Replace the Module 11
Wire the DeviceNet Connector 12
Connect the Module to the DeviceNet Network 13
Apply Chassis Power 13
Using the Manual Configuration Pushbutton 14
Interpreting the Alphanumeric Display 16
Interpreting the LED Status Indicators 19
ControlLogix Controller Interface 21
Hazardous Location Information 25
Specifications 27
Allen-Bradley

2ControlLogix DeviceNet Scanner Module
Publication 1756-IN566B-EN-P - April 2001
Throughout this manual we use the following notes to make you
aware of safety considerations:
Warning and Attention statements help you to:
•identify a hazard
•avoid a hazard
•recognize the consequences
We use the following note to call attention to critical information:
Change bars are used to indicate information that has changed or
been added since the previous version of these instructions.
WARNING
!
Identifies information about practices or
circumstances that have the potential to create an
explosion hazard.
ATTENTION
!
Identifies information about other practices or
circumstances that can lead to personal injury or
death, property damage or economic loss.
IMPORTANT
Identifies information that is critical for successful
application and understanding of the product.

ControlLogix DeviceNet Scanner Module 3
Publication 1756-IN566B-EN-P - April 2001
European Communities (EC) Directive Compliance
If this product has the CE mark it is approved for installation within
the European Union and EEA regions. It has been designed and
tested to meet the following directives.
EMC Directive
This product is tested to meet the Council Directive 89/336/EC
Electromagnetic Compatibility (EMC) by applying the following
standards, in whole or in part, documented in a technical
construction file:
•EN 50081-2 EMC — Generic Emission Standard, Part 2 —
Industrial Environment
•EN 50082-2 EMC — Generic Immunity Standard, Part 2 —
Industrial Environment
This product is intended for use in an industrial environment.
Low Voltage Directive
This product is tested to meet Council Directive 73/23/EEC Low
Voltage, by applying the safety requirements of EN 61131-2
Programmable Controllers, Part 2 - Equipment Requirements and
Tests.
For specific information required by EN 61131-2, see the appropriate
sections in this publication, as well as the following Allen-Bradley
publications:
•Industrial Automation Wiring and Grounding Guidelines,
publication 1770-4.1
•Automation Systems Catalog, publication B113
Open style devices must be provided with environmental and safety
protection by proper mounting in enclosures designed for specific
application conditions. See NEMA Standards publication 250 and IEC
publication 529, as applicable, for explanations of the degrees of
protection provided by different types of enclosure.
Allen-Bradley

4ControlLogix DeviceNet Scanner Module
Publication 1756-IN566B-EN-P - April 2001
Enclosure and Environmental Requirements Specific To This Product
This product must be mounted within a suitable system enclosure to
prevent personal injury resulting from accessibility to live parts. The
interior of this enclosure must be accessible only by the use of a tool.
This industrial control equipment is intended to operate in a Pollution
Degree 2 environment, in overvoltage category II applications, (as
defined in IEC publication 664A) at altitudes up to 2000 meters
without derating.
Preventing Electrostatic Discharge
The DeviceNet scanner module is sensitive to electrostatic discharge.
ATTENTION
!
This module is sensitive to electrostatic discharge.
Electrostatic discharge can damage integrated
circuits or semiconductors if you touch backplane
connector pins. Follow these guidelines when you
handle the module:
•Touch a grounded object to discharge static
potential.
•Wear an approved wrist-strap grounding
device.
•Do not touch the backplane connector or
connector pins.
•Do not touch circuit components inside the
module.
•If available, use a static-safe work station.
•When not in use, keep the module in its
static-shield bag.

ControlLogix DeviceNet Scanner Module 5
Publication 1756-IN566B-EN-P - April 2001
Understand the Module’s Software Features
The 1756-DNB module has the software features described in the
following sections. You activate these features by using RSNetWorx
for DeviceNet™ software (catalog no. 9357-DNETL3). For more
information, refer to the appropriate RSNetWorx for DeviceNet
documentation, and to the 1756-DNB Scanner User Manual,
publication 1756-UM515C-EN-P.
Slave Mode
The slave mode feature allows processor-to-processor
communication. It does this by allowing the scanner to perform as a
slave device to another master on the network.
Like other slaves, the scanner module exchanges data with only one
master when it is in slave mode. You control what information is
exchanged through the scan list configuration and associated
mapping functions of RSNetWorx for DeviceNet software.
The 1756-DNB can function in the following modes:
Change of State
The scanner module can send and receive data on a change of state
basis with slave devices that also have this feature. Data is sent:
•whenever a data change occurs, or
•at a user-configurable heartbeat rate
Scanner is in this mode when it
Null contains an empty or disabled scan list (out-of-box default).
Master serves as a master to one or more slaves but is not
simultaneously serving as a slave to another master.
Slave serves as a slave to another master.
Dual serves as both a master to one or more slaves and as a slave to
another master simultaneously.
Allen-Bradley

6ControlLogix DeviceNet Scanner Module
Publication 1756-IN566B-EN-P - April 2001
Change of state increases system performance by reducing network
traffic, since data is only sent on an as-needed basis. Use RSNetWorx
for DeviceNet software to activate this feature.
Cyclic I/O
The scanner module can send and receive data on a cyclic basis with
slave devices that also have this feature.
Cyclic I/O increases system performance by reducing network traffic,
since data is only sent at a user-configurable rate. Use RSNetWorx for
DeviceNet software to activate this feature.
Identify Module Components
Use the following figure to identify the external components of the
module.
DeviceNet TM
MOD/NET I/O OK
Backplane
Connector
Product
Label
Front View
Side View
Front
Panel
Wiring
DeviceNet
Connector
Health and
Status Indicators
Label
Color
Codes
Door

ControlLogix DeviceNet Scanner Module 7
Publication 1756-IN566B-EN-P - April 2001
Prepare to Install the Module
Before you install the module, make sure that you have these
components.
1756-DNB module 1756-A4, 1756-A7, or 1756-A10 chassis 1756-PA72/75 or 1756-PB72/75
power supply
DeviceNet open-style or
10-position connector
DeviceNet truck
small screwdriver
or drop cable
Allen-Bradley

8ControlLogix DeviceNet Scanner Module
Publication 1756-IN566B-EN-P - April 2001
Installing or Removing the Module Under Power
This module is designed to be installed or removed while chassis
power is applied.
Prepare the Chassis for Module Installation
Before you install the module, you must install and connect a
ControlLogix chassis and power supply. A 4-slot chassis with a power
supply is shown below.
WARNING
!
When you insert or remove a module while
backplane power is on, an electrical arc may
occur. An electrical arc can cause personal injury
or property damage by:
•sending an erroneous signal to your system’s
field device causing unintended machine
motion or loss of process control
•causing an explosion in a hazardous
environment
Repeated electrical arcing causes excessive wear
to contacts on both the module and its mating
connector. Worn contacts may create electrical
resistance that can affect module operation.
1756-A4
Chassis
Power
Supply

ControlLogix DeviceNet Scanner Module 9
Publication 1756-IN566B-EN-P - April 2001
For information on installing these products, refer to the publications
listed in the following table.
Determine Module Slot Location
This figure shows chassis slot numbering in a 4-slot chassis. Slot 0 is
the first slot and is always located to the right of the power supply.
You can use any size ControlLogix chassis and install the module in
any slot. You can also install multiple 1756-DNB modules in the same
chassis. You can install as many modules as your power supply can
accommodate (i.e., number for which the power supply is rated).
Chassis
Type
Chassis
Installation
Power
Supply
Power Supply
Installation
Series B: 1756-A4, -A7, -A10, -A13 Pub. No.
1756-IN080
1756-PA72/B Pub. No.
1756-5.67
1756-PB72/B
1756-PA75/A Pub. No.
1756-5.78
1756-PB75/A
Power Supply
Slot 0
Slot 1
Slot 2
Slot 3
Chassis
Allen-Bradley

10 ControlLogix DeviceNet Scanner Module
Publication 1756-IN566B-EN-P - April 2001
Install the Module
POWER
1
2
3
Align the circuit board with top
and bottom guides in the chassis.
Circuit board
Slide the module into the chassis.
Make sure the module properly connects
to the chassis backplane.
The module is fully installed
when it is flush with the power
supply or other installed modules.

ControlLogix DeviceNet Scanner Module 11
Publication 1756-IN566B-EN-P - April 2001
Remove or Replace the Module
IMPORTANT
If you are replacing an existing 1756-DNB module
with another 1756-DNB module and you want to
resume identical system operation, you must
install the new module in the same slot.
1
2
POWER
POWER
Push on upper and lower module
tabs to disengage them.
Slide the module out of the chassis.
Allen-Bradley

12 ControlLogix DeviceNet Scanner Module
Publication 1756-IN566B-EN-P - April 2001
Wire the DeviceNet Connector
Use an open-style 5- or 10-position linear plug to connect to the
DeviceNet network. An open-style 10-position linear plug is provided
with your module.
Wire the connector according to the following illustrations.
IMPORTANT
For detailed DeviceNet connection information,
see the DeviceNet Cable System Planning and
Installation Manual, publication DN-6.7.2. Also see
the Industrial Automation Wiring and Grounding
Guidelines, publication 1770-4.1.
Color chips (dots)
Red dot
Black dot
Blue dot
White dot
10-position plug 5-position plug
20474-
D
D
D
D
D
20479-M
Red
White
Bare
Blue
Black
wiring color scheme
Module label shows
linear plug
10-position
drop line or
DeviceNet
trunk cable
Red
White
Bare
Blue
Black

ControlLogix DeviceNet Scanner Module 13
Publication 1756-IN566B-EN-P - April 2001
Connect the Module to the DeviceNet Network
Attach the connector to the module’s DeviceNet port as shown
below. Tighten the screws on the connector as needed.
Apply Chassis Power
Check the Module Alphanumeric Display on Power-up
Check the module alphanumeric display to determine if the module
is operating. When you apply chassis power, the alphanumeric
display cycles through the following information:
10-position
linear plug
DeviceNet Port Connector
DeviceNet Drop Line or Trunk Connector
ON
POWER
OFF
ON
POWER
OFF
Power supply indicator is green
when power supply is working correctly.
Allen-Bradley

14 ControlLogix DeviceNet Scanner Module
Publication 1756-IN566B-EN-P - April 2001
Using the Manual Configuration Pushbutton
The 1756-DNB scanner module has a dual function pushbutton.
•Without a network connection it displays baud rates, allowing
you to select the rate for your module.
•With a network connection it displays the MAC ID or network
node address, allowing you to select the node address for your
module.
If your module is not connected to the network:
1. Select the network baud rate by pushing and holding the
pushbutton.
TIP
You can use RSNetWorx for DeviceNet software to
set the baud rate and MAC ID of your module. The
1756-DNB module is also equipped with a manual
pushbutton for setting baud rate and MAC ID, as
described in the following section.
DeviceNet TM
MOD/NET I/O OK
1. Firmware major revision (01 through 128)
2. Firmware minor revision (01 through 255)
3. Optional Firmware Build Number
4. Baud rate (125, 250, or 500)
5. MAC ID (00 to 63)
Alphanumeric
Display
Manual
Configuration
Pushbutton

ControlLogix DeviceNet Scanner Module 15
Publication 1756-IN566B-EN-P - April 2001
The module’s alphanumeric display cycles through the
allowable baud rates (125k 250k, 500k).
2. Release the button when the baud rate you want to select is
shown on the display.
If your module is connected to the network:
1. Select the network node address by pushing in and holding
the pushbutton.
The display starts at the current MAC ID and cycles through all
legitimate the network node addresses (00-63).
2. Release the button when the address number shown on the
display is the number you want to select.
Allen-Bradley

16 ControlLogix DeviceNet Scanner Module
Publication 1756-IN566B-EN-P - April 2001
Interpreting the Alphanumeric Display
Your 1756-DNB scanner module displays alphanumeric codes that
provide diagnostic information about your module. The
alphanumeric display flashes the codes at approximately 1 second
intervals.
What is Displayed?
As an example, the display for RUN toggles between the network
address and the mode:
A#01
RUN
If there is a problem, the display shows the network address,
followed by the MAC ID of the problem node, followed by the error
code. The display toggles through these elements until the error is
corrected.
A#01
N#33
E#72
The following table summarizes the codes.
Alphanumeric Status Codes
Code Description Recommended Action
70 Scanner failed Duplicate Node
Address check
Change the scanner address to
another available one. The node
address you selected is already in use
on that network.
71 Illegal data in scan list table (node
number alternately flashes).
Reconfigure the scan list table and
remove any illegal data.
72 Slave device stopped communicating
(node number alternately flashes).
Inspect the slave devices and verify
connections.
73 Device’s identity information does not
match electronic key in scan list table
entry (node number alternately
flashes).
Verify that the correct device is at this
node number. Make sure the device at
the scrolling node address matches
the desired electronic key (vendor,
product code, product type, etc.).

ControlLogix DeviceNet Scanner Module 17
Publication 1756-IN566B-EN-P - April 2001
74 Data overrun on port detected. Modify your configuration and check
for invalid data. Check network
communication traffic.
75 No traffic detected on the network. Check the network configuration.
76 No direct network traffic for scanner
detected.
None. The scanner hears other
network communication, but none
directed to itself.
77 Data size expected by the device does
not match scan list entry (node
number alternately flashes).
Reconfigure your module for the
correct transmit and receive data
sizes.
78 Slave device in scan list table does
not exist (node number alternately
flashes).
Add the device to the network, or
delete the scan list entry for that
device.
79 Scanner has failed to transmit a
message.
Make sure that your module is
connected to a valid network.
Check for disconnected cables.
80 Scanner is in IDLE mode. Put controller in RUN mode. Enable
RUN bit in Module Command Register.
81 Scanner is in FAULT mode. Check Module Command Register for
FAULT bit set.
82 Error detected in sequence of
fragmented I/O messages from device
(node number alternately flashes).
Check scan list table entry for slave
device to make sure that input and
output data lengths are correct. Check
slave device configuration.
83 Slave device is returning error
responses when scanner attempts to
communicate with it (node number
alternately flashes).
Check accuracy of scan list table entry.
Check slave device configuration.
Slave device may be in another
master’s scan list. Reboot slave device.
84 Scanner is initializing the DeviceNet
network.
None. This code clears itself once
scanner attempts to initialize all slave
devices on the network.
85 Data size was incorrect for this device
at runtime.
Slave device is transmitting incorrect
length data. Try replacing slave device.
86 Device is producing zero length data
(idle state) while scanner is in Run
Mode.
Check device configuration and slave
node status.
90 User has disabled communication port Check Module Command Register for
DISABLE bit set.
Alphanumeric Status Codes
Code Description Recommended Action
Allen-Bradley

18 ControlLogix DeviceNet Scanner Module
Publication 1756-IN566B-EN-P - April 2001
91 Bus-off condition detected on comm
port. Scanner is detecting
communication errors.
Check DeviceNet connections and
physical media integrity. Check system
for failed slave devices or other
possible sources of network
interference.
92 No network power detected on
communication port.
Provide network power. Make sure
that module drop cable is providing
network power to module comm. port.
95 Application FLASH update in progress. None. Do not disconnect the module
while application FLASH is in progress.
You will lose any existing data in the
scanner’s memory.
97 Scanner halted by user command. Check Module Command Register for
HALT bit set.
98 General firmware error. Replace module.
A#00
to
A#63
Normal operation. The numeric
display matches the scanner’s node
address on the DeviceNet network.
Do nothing.
IDLE Scanner is in IDLE mode. Put controller in RUN mode. Enable
RUN bit in Module Command Register.
Network
Disabled
User has disabled communication
port.
Reconfigure your module. check
Module Command Register.
No
Network
Power
No network power detected on
communication port.
Provide network power. Make sure
that scanner drop cable is providing
network power to scanner
communication port.
NoRX No scan list is active in the module or
no messages have been received by
the scanner.
Enter a scan list. Check DeviceNet
connection on front of module.
NoTX No direct network traffic for scanner
detected.
None. The scanner hears other
network communication.
Alphanumeric Status Codes
Code Description Recommended Action

ControlLogix DeviceNet Scanner Module 19
Publication 1756-IN566B-EN-P - April 2001
Interpreting the LED Status Indicators
The three LED status indicators on the module provide information
about your network and its connections. The following tables outline
the indicator condition and the corresponding status, and explain
what each condition means.
Module/Network (MOD/NET) Status Indicator
This bi-color (green/red) LED provides device and communication
status as follows:
Condition Status Indicates
off not powered/
not online
Device is not online.
•The device has not completed the
Dup_MAC_ID test yet.
•The device may not be powered.
green device operational
AND online and
connected
Device is operating in a normal condition and is
online with connections established.
•For a group 2 Only device, this means the
device is allocated to a Master.
•For a UCMM capable device, this means the
device has one or more established
connections.
flashing
green(1)
(1) The flash rate of the LED is approximately 1 flash per second. The LED should be on for approximately
0.5 seconds and off for approximately 0.5 seconds.
device operational
AND online and not
connected
or
device online and
device needs
commissioning
The device is operating in a normal condition and is
online with no connections established.
•The device has passed the Dup_MAC_ID test,
is online, but has no established connections
to other nodes.
•For a Group 2 only device, this means that the
device is not allocated to a master.
•For a UCMM capable device, this means that
the device has no established connections.
•Configuration missing, incomplete, or incorrect.
flashing
red(1)
minor fault and/or
connection time-out
Recoverable fault.and/or one or more I/O
connections are in the timed-out state.
red critical fault or critical
link failure
Device has an unrecoverable fault and may need to
be replaced.
Failed communication device. The device has
detected an error (duplicate MAC ID or bus-off) that
has rendered it incapable of communicating on the
network.
Allen-Bradley

20 ControlLogix DeviceNet Scanner Module
Publication 1756-IN566B-EN-P - April 2001
I/O Status Indicator
This bi-color (green/red) LED indicates the status of the 1756-DNB’s
I/O scanning state. The I/O Status LED informs you whether this
device has outputs under control and whether any outputs or inputs
are active (outputs active, inputs producing, etc.) or faulted. The LED
reflects the mod/state of the inputs and outputs, not necessarily the
on/off condition of the I/O points themselves.
Health (OK) Status Indicator
This bi-color (green/red) LED indicates whether the device has power
and is operating properly.
Condition Indicates
off Scanner is not online. Check network power.
green Scanner is in RUN mode, outputs are under control,
and inputs are being consumed.
flashing
green(1)
(1) The flash rate of the LED is approximately 1 flash per second. The LED
should be on for approximately 0.5 seconds and off for approximately 0.5
seconds.
Scanner is in IDLE mode, outputs are not under
control, and inputs are being consumed.
Condition Status Indicates
off no power No power applied to device. Apply chassis power.
Verify module is completely inserted into chassis
and backplane.
green device operational Device is operating normally. The DNB has at least
one connection to it from a controller.
flashing
green(1)
(1) The flash rate of the LED is approximately 1 flash per second. The LED should be on for approximately
0.5 seconds and off for approximately 0.5 seconds.
device in standby The device is operating correctly; however, no
controller is controlling it. Verify that the DNB
module is properly configured in the controller’s I/O
configuration.
red unrecoverable fault
or
device self testing
Device has an unrecoverable fault; repair or replace
it, or
Device is in self test during power-up.