3, Installation and Wiring. Allen-Bradley 1769-SDN
Allen-Bradley 1769-SDN is a DeviceNet Scanner Module that provides a gateway between CompactLogix controllers and DeviceNet devices. It allows you to connect up to 64 DeviceNet slave devices and communicate with them using the RSNetWorx for DeviceNet software. The 1769-SDN is ideal for applications where you need to control a large number of devices, such as in a manufacturing or automation setting.
Advertisement
Advertisement
Chapter
3
Installation and Wiring
This chapter describes how to install and wire the 1769-SDN scanner module. The following table describes what this chapter contains and where to find specific information.
For information about
Compliance to European Union Directives
Replacing the Scanner Module within a System
See page
1
Compliance to European
Union Directives
This product is approved for installation within the European Union and EEA regions. It has been designed and tested to meet the following directives.
EMC Directive
The module is tested to meet Council Directive 89/336/EEC
Electromagnetic Compatibility (EMC) and 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.
Allen-Bradley Drives
Publication 1769-UM009B-EN-P - May 2002
3-2 Installation and Wiring
Power Requirements
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 EN61131-2, see the appropriate sections in this publication, as well as the following Allen-Bradley publications:
•
Industrial Automation, Wiring and Grounding Guidelines for
Noise Immunity , publication 1770-4.1
•
Automation Systems Catalog , publication B113
The module receives power through the Compact I/O bus interface from the +5V dc system power supply. The maximum current drawn by the module is shown in the table below.
Table 3.1
Module
1769-SDN
5V dc
440 mA
24V dc
0 mA
The module also draws power from the DeviceNet network. The power requirements are shown in the table below.
Table 3.2
Module
1769-SDN
DeviceNet Power Requirements
N.E.C. Class 2
90 mA at 11V dc (maximum)
110 mA at 25V dc (maximum)
200 mA for 1.5 ms (inrush)
Publication 1769-UM009B-EN-P - May 2002
General Considerations
Installation and Wiring 3-3
Compact I/O is suitable for use in an industrial environment when installed in accordance with these instructions. Specifically, this equipment is intended for use in clean, dry environments (Pollution degree 2
(1)
) and to circuits not exceeding Over Voltage Category II
(2)
(IEC 60664-1).
(3)
Hazardous Location Considerations
This equipment is suitable for use in Class I, Division 2, Groups A, B,
C, D or non-hazardous locations only. The following WARNING statement applies to use in hazardous locations.
WARNING
!
EXPLOSION HAZARD
Substitution of components may impair suitability for
Class I, Division 2.
Do not replace components or disconnect equipment unless power has been switched off or the area is known to be non-hazardous.
Do not connect or disconnect components unless power has been switched off or the area is known to be non-hazardous.
This product must be installed in an enclosure.
All wiring must comply with N.E.C. article 501-4(b).
(1)
Pollution Degree 2 is an environment where, normally, only non-conductive pollution occurs except that occasionally a temporary conductivity caused by condensation shall be expected.
(2)
Over Voltage Category II is the load level section of the electrical distribution system. At this level transient voltages are controlled and do not exceed the impulse voltage capability of the product’s insulation.
(3)
Pollution Degree 2 and Over Voltage Category II are International Electrotechnical Commission (IEC)
Allen-Bradley Drives
Publication 1769-UM009B-EN-P - May 2002
3-4 Installation and Wiring
Prevent Electrostatic Discharge
ATTENTION
!
Electrostatic discharge can damage integrated circuits or semiconductors if you touch the bus 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 bus connector or connector pins.
•
Do not touch circuit components inside the module.
•
If available, use a static-safe work station.
•
When it is not in use, keep the module in its static-shield box.
Remove Power
ATTENTION
!
Remove power before removing or inserting this module. When you remove or insert a module with power applied, 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 devices, causing unintended machine motion
• causing an explosion in a hazardous environment
Electrical arcing causes excessive wear to contacts on both the module and its mating connector and may lead to premature failure.
Reducing Noise
We recommend installing this module in an industrial enclosure to reduce the effects of electrical interference. Group your modules to minimize adverse effects from radiated electrical noise and heat.
Publication 1769-UM009B-EN-P - May 2002
System Planning
Installation and Wiring 3-5
Protecting the Circuit Board from Contamination
The printed circuit boards of the modules must be protected from dirt, oil, moisture, and other airborne contaminants. To protect these boards, we recommend installing the system in an enclosure suitable for the environment. The interior of the enclosure should be kept clean and the enclosure door should be kept closed whenever possible.
Consider the following when planning your system:
•
The scanner can communicate with up to 63 DeviceNet devices.
•
The scanner, as a master, can own up to 63 slave I/O nodes.
•
The scanner can simultaneously be a master and be a slave owned by another DeviceNet master.
•
A 1769-ECR (right end cap) or 1769-ECL (left end cap) is required to terminate the end of the Compact I/O bus.
•
Each bank of Compact I/O must have its own power supply (a
MicroLogix 1500 acts as the power supply for modules directly connected to it).
•
A Compact I/O power supply, or MicroLogix 1500 Base Unit, has limits on the amount of +5V dc and +24V dc current it can supply to modules in its I/O bank. These limits depend on the catalog number (e.g. 1769-PA2) of the supply. A bank of modules must not exceed the current limits of the I/O bank power supply or MicroLogix 1500 Base Unit.
Refer to the Compact 1769 Expansion I/O Power Supplies
Installation Instructions , publication 1769-5.14 or the MicroLogix
1500 User Manual , publication 1764-UM001A-EN-P.
•
The scanner has a distance rating of four, therefore the scanner must be within four modules of the I/O bank’s power supply.
•
Determine the DeviceNet baud rate based on standard
DeviceNet considerations.
•
Consider the number of words of I/O data the host controller supports.
For more information on planning your DeviceNet network, refer to the DeviceNet Cable System Planning and Installation Manual , publication DN-6.7.2.
Allen-Bradley Drives
Publication 1769-UM009B-EN-P - May 2002
3-6 Installation and Wiring
System Assembly
The module can be attached to an adjacent controller, power supply, or I/O module. For mounting instructions, see “Panel Mounting” on
page 3-8, or “DIN Rail Mounting” on page 3-10. To work with a
system that is already mounted, see “Replacing a Single Module within
The following procedure shows you how to assemble the Compact
I/O system.
A
D
E
C
B
B
G
F
1.
Disconnect power.
2.
Check that the bus lever of the module (A) is in the unlocked
(fully right) position.
3.
Use the upper and lower tongue-and-groove slots (B) to secure the modules together.
4.
Move the module back along the tongue-and-groove slots until the bus connectors (C) line up with each other.
5.
Use your fingers or a small screw driver to push the bus lever back slightly to clear the positioning tab (D).
6.
Move the module’s bus lever fully to the left (E) until it clicks.
Ensure it is locked firmly in place.
ATTENTION
When attaching I/O modules, it is very important that the bus connectors are securely locked together to ensure proper electrical connection.
!
7.
Attach an end cap terminator (F) to the last module in the system by using the tongue-and-groove slots as before.
Publication 1769-UM009B-EN-P - May 2002
Installation and Wiring 3-7
8.
Lock the end cap bus terminator (G).
IMPORTANT
A 1769-ECR or 1769-ECL right or left end cap must be used to terminate the end of the serial communication bus.
System Mounting
ATTENTION
!
During panel or DIN rail mounting of all devices, be sure that all debris (metal chips, wire strands, etc.) is kept from falling into the module. Debris that falls into the module could cause damage at power up.
Minimum Spacing
Maintain spacing from enclosure walls, wireways, adjacent equipment, etc. Allow 50 mm (2 in.) of space on all sides for adequate ventilation, as shown below:
Top
Side
Host Controller
Side
Bottom
Allow at least 110 mm (4.33 in.) of enclosure depth to accommodate the module and the DeviceNet connector.
Allen-Bradley Drives
Publication 1769-UM009B-EN-P - May 2002
3-8 Installation and Wiring
Mounting Hole
Dimension
Panel Mounting
Mount the module to a panel using two screws per module. Use M4 or #8 panhead screws. Mounting screws are required on every module.
Panel Mounting Using the Dimensional Drawing
NOTE: All dimensions are in mm (inches). Hole spacing tolerance: ±0.4 mm (0.016 in.).
Compact I/O with CompactLogix Controller and Power Supply
50 mm
(1.97 in)
40 mm
(1.58 in)
35 mm
(1.38 in)
35 mm
(1.38 in)
35 mm
(1.38 in)
70 mm
(2.76 in)
35 mm
(1.38 in)
35 mm
(1.38 in)
35 mm
(1.38 in)
28.5 mm
(1.12 in)
DIN Rail
Center Line
14.7 mm
(0.58 in)
Publication 1769-UM009B-EN-P - May 2002
Mounting Hole
Dimension
Installation and Wiring 3-9
Compact I/O with MicroLogix 1500 Base Unit and Processor
168 mm
(6.62 in)
147 mm
(5.79 in)
35 mm
(1.38 in)
35 mm
(1.38 in)
28.5 mm
(1.12 in)
DIN Rail
Center Line
13.5 mm
(0.53 in)
14.7 mm
(0.58 in)
Panel Mounting Procedure Using Modules as a Template
The following procedure allows you to use the assembled modules as a template for drilling holes in the panel. Due to module mounting hole tolerance, it is important to follow these procedures:
1.
On a clean work surface, assemble no more than three modules.
2.
Using the assembled modules as a template, carefully mark the center of all module-mounting holes on the panel.
3.
Return the assembled modules to the clean work surface, including any previously mounted modules.
4.
Drill and tap the mounting holes for the recommended M4 or #8 screw.
5.
Place the modules back on the panel, and check for proper hole alignment.
6.
Attach the modules to the panel using the mounting screws.
TIP
If mounting more modules, mount only the last one of this group and put the others aside. This reduces remounting time during drilling and tapping of the next group.
7.
Repeat steps 1 to 6 for any remaining modules.
Allen-Bradley Drives
Publication 1769-UM009B-EN-P - May 2002
3-10 Installation and Wiring
DIN Rail Mounting
The module can be mounted using the following DIN rails:
35 x 7.5 mm (EN 50 022 - 35 x 7.5) or 35 x 15 mm (EN 50 022 - 35 x
15).
Before mounting the module on a DIN rail, close the DIN rail latches.
Press the DIN rail mounting area of the module against the DIN rail.
The latches will momentarily open and lock into place. DIN rail mounting dimensions are shown below.
Table 3.3
Dimension Height
A
B
118 mm (4.65 in.)
59 mm (2.325 in.)
Replacing the Scanner
Module within a System
The scanner can be replaced while the system is mounted to a panel
(or DIN rail) once power is removed.
1.
Remove power. See important note on page 3-4.
2.
Remove the DeviceNet cable from the scanner by removing the
DeviceNet connector.
3.
Remove the upper and lower mounting screws from the scanner
(or open the DIN latches using a flat-blade screwdriver).
4.
On the scanner to be replaced and the right-side adjacent module (or end cap if the scanner is the last module in the bank), move the bus levers to the right (unlock) to disconnect the scanner from the adjacent modules.
5.
Gently slide the disconnected scanner module forward.
Publication 1769-UM009B-EN-P - May 2002
Installation and Wiring 3-11
6.
If you feel excessive resistance, make sure that you disconnected the scanner from the bus and that you removed both mounting screws (or opened the DIN latches).
TIP
It may be necessary to rock the scanner slightly from front to back to remove it, or, in a panel-mounted system, to loosen the screws of adjacent modules.
7.
Before installing the replacement scanner, be sure that the bus lever on the right-side adjacent module is in the unlocked (fully right) position.
8.
Slide the replacement scanner into the open slot.
9.
Connect the scanner and modules together by locking (fully left) the bus levers on the replacement scanner and the right-side adjacent module or end cap.
10.
Replace the mounting screws (or snap the scanner onto the DIN rail).
11.
Replace the DeviceNet cable on the scanner by attaching the connector to the scanner.
12.
Restore scanner configuration using RSNetWorx for DeviceNet.
IMPORTANT
Be sure that the new module has the same node address and baud rate as the module that was replaced.
Field Wiring Connections
Grounding the Scanner Module
This product is intended to be mounted to a well-grounded mounting surface such as a metal panel. Additional grounding connections from the scanner’s mounting tabs or DIN rail (if used), are not required unless the mounting surface cannot be grounded.
ATTENTION
!
The grounding screw on the front of the scanner must be connected to a suitable ground source when operating in electrically noisy environments. Use a
#14 AWG wire to make this connection.
Refer to Industrial Automation Wiring and Grounding Guidelines ,
Allen-Bradley publication 1770-4.1, for additional information.
Allen-Bradley Drives
Publication 1769-UM009B-EN-P - May 2002
3-12 Installation and Wiring
DeviceNet Wiring
DeviceNet
Connector
Grounding Screw
Use #14 AWG wire to connect to panel ground.
Table 3.4
Connect
(1)
Red Wire
White Wire
Bare Wire
Blue Wire
Black Wire
To
V+
CAN High
Shield
CAN Low
V-
1.
Connect the DeviceNet cable to the removable connector as shown.
2.
Insert the removable female connector into the mating male connector on the DeviceNet scanner module.
3.
Screw the removable connector to the scanner case with the upper and lower mounting screws. Screw torque is 0.6 to 0.7
Nm (5 to 6 in-lbs).
IMPORTANT
If the 1769-SDN is the first or last device connected to the DeviceNet network trunkline, be sure to add a termination resistor (120
Ω
1%
≥
¼W resistor,
Allen-Bradley part number 1485A-C2) across the Blue
(CAN Low) and White (CAN High) wires.
Scanner Module Power-Up
When power is applied via the Compact I/O bus, the scanner module goes through a self test sequence. Upon successful completion of the self test, the scanner is ready to communicate.
The default scanner settings are:
• baud rate = 125K
• node address = 63
Use your configuration software to change the baud rate and node address.
What’s Next?
The next step is to configure the scanner and perform I/O data mapping through RSNetWorx.
Publication 1769-UM009B-EN-P - May 2002

Public link updated
The public link to your chat has been updated.
Advertisement
Key features
- Connects up to 64 DeviceNet slave devices
- Provides a gateway between CompactLogix controllers and DeviceNet devices
- Uses the RSNetWorx for DeviceNet software for configuration
- Supports both explicit and implicit messaging
- Provides diagnostic information for troubleshooting
- Has a built-in watchdog timer to ensure reliable operation