1756-CNB

Rated 5 with 9 reviews

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1756-CNB

Revisions: Ser A Ser B Ser C Ser D Ser E 
Description: Allen Bradley ControlLogix Bridge Module with 99 Maximum Nodes
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Description:

Allen Bradley ControlLogix Bridge Module with 99 Maximum Nodes



Warranty: 1 year DO Supply Warranty Included
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Repairs: We offer repair service for the 1756-CNB.
Exchange: Exchange credit for your defective unit available.

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Rated 5 with 9 reviews

    Technical Specifications for 1756-CNB

ManufacturerRockwell Automation
BrandAllen-Bradley
Part Number/Catalog No.1756-CNB
SeriesControlLogix
Module TypeBridge Module
Maximum Nodes99
Maximum Connections64
ControlNet Communication Rate5 megabits-second
Configuration Standard
Input Current970 milliamps at 5.1 Volts DC, 1.7 milliamps at 24 Volts DC
Thermal Dissipation17.4 BTU per Hour
Power Dissipation5.1 Watts
Slot width1
Weight0.57 pounds (0.26 kilograms)
ManufacturerRockwell Automation
BrandAllen-Bradley
Part Number/Catalog No.1756-CNB
SeriesControlLogix
Module TypeBridge Module
Maximum Nodes99
Maximum Connections64
ControlNet Communication Rate5 megabits-second
Configuration Standard
Input Current970 milliamps at 5.1 Volts DC, 1.7 milliamps at 24 Volts DC
Thermal Dissipation17.4 BTU per Hour
Power Dissipation5.1 Watts
Slot width1
Weight0.57 pounds (0.26 kilograms)

About 1756-CNB

The Allen-Bradley 1756-CNB or ControlNet Bridge module is an interface module used for communicating within a ControlNet network. Compared to the Allen-Bradley 1756-CNBR module, the 1756-CNB uses a standard, or non-redundant, configuration. This module is perfect if the users’ applications have 40 to 48 Logix communication connections per communication module. It has a communication rate of 5 megabytes per second and it has 99 nodes available. The 1756-CNB module handles 2 things, namely the control of I/O data when it is used with a Logix5550 controller for scheduled data and for unscheduled data, bridging data between the ControlLogix backplane and the ControlNet Network. Make sure that the path information is correct in order to properly route the messages it receives.
Up to 64 bidirectional connections with other ControlNet devices can be supported by the 1756-CNB module. It can be a mix of both scheduled and unscheduled connections. However, the number of supported connections also depends on the network configuration. If an application needs more connections, the users can add another 1756-CNB module, but they must make sure to do it in the same chassis and on the same network as the first module. It can also support up to 20 buffers for unconnected messages. It also has 2 ports - 1 ControlNet BNC port and 1 ControlNet RJ45 port. The users need to set the module's node address switches first when installing the 1756-CNB module. They can select a unique node address from 01 to 99. The users can then use the module as a standalone control module by using 1 set of modules or as a redundant control setup by using identical pairs of modules (partners). Note that when using redundant control, the node address switches should have the same node address. The 1756-CNB current draw at 5.1 Volts DC is 970 milliamps and 1.7 milliamps if the current draw is at 24 Volts DC. Its power dissipation is rated at 5.14 Watts.

FAQ for 1756-CNB

Question: How much power dissipation does the 1756-CNB have?

Answer: The 1756-CNB's power dissipation is 5.14 Watts.

 

Question: How many ports does the 1756-CNB have?

Answer: The 1756-CNB has 2 ports/

 

Question: How many nodes does the 1756-CNB have?

Answer: The 1756-CNB has 99 nodes.

Troubleshooting for 1756-CNB

The 1756-CNB Series E modules work for all non-redundant ControlLogix applications.
For ControlLogix Redundancy releases 8,11,13, and 15, only Series D of this module is supported. Series E is supported in Redundancy releases 15 and later.

1756-CNB Basic Troubleshooting:

  • Check for fault: icpserv.c line 2068, which indicates a hardware or chassis failure

  • Do a Visual inspection for faulted or damaged components 

  • Check connecting pins 

  • OK light should be flashing 

  • Ensure node addresses are correct in programming as well as on each device

  • Port A will turn green when an adequate connection is made with the ControlNet network 

  • The card should be visible in your ControlNet network ( check revisions for compatibility)

  • Check each ControlNet coax cable as well as all other communications cables for damage 

  • Check literature for LED indicator codes

1756-CNB Testing 

  • Slide the card into the chassis and apply power to the rack 

  • Add the CNB into the processor's backplane

  • Download the file to the processor with the 1756-CNB card added to the backplane

  • I/O OK light will be solid green

  • If you are directly connected to the CNB card it will be visible in RS-Linx along with any other module that is connected to the card with the ControlNet coax cable

Repair Services for 1756-CNB

Type Lead Time Price Action
Repair Service 2-4 weeks $179cartAdd to Cart
Our highly skilled technicians can repair your ControlLogix 1756-CNB. All our repairs come with a 1 Year Warranty. Please contact us for additional information about our repair process.

Revisions for 1756-CNB

Please refer to the manual for more information about the 1756-CNB such as the wiring diagrams, data sheets, firmware information and migration or obsolescence details.

Revision Part # Also Known as Availability
1756-CNB Ser A
1756-CNB/A, Series A, Rev A Request Quote
1756-CNB Ser B
1756-CNB/B, Series B, Rev B Request Quote
1756-CNB Ser C
1756-CNB/C, Series C, Rev C Request Quote
1756-CNB Ser D
1756-CNB/D, Series D, Rev D Request Quote
1756-CNB Ser E
1756-CNB/E, Series E, Rev E Request Quote
Common misspellings:
  • l756-CNB
  • 1756-CN8
Technical Specifications
ManufacturerRockwell Automation
BrandAllen-Bradley
Part Number/Catalog No.1756-CNB
SeriesControlLogix
Module TypeBridge Module
Maximum Nodes99
Maximum Connections64
ControlNet Communication Rate5 megabits-second
Configuration Standard
Input Current970 milliamps at 5.1 Volts DC, 1.7 milliamps at 24 Volts DC
Thermal Dissipation17.4 BTU per Hour
Power Dissipation5.1 Watts
Slot width1
Weight0.57 pounds (0.26 kilograms)
ManufacturerRockwell Automation
BrandAllen-Bradley
Part Number/Catalog No.1756-CNB
SeriesControlLogix
Module TypeBridge Module
Maximum Nodes99
Maximum Connections64
ControlNet Communication Rate5 megabits-second
Configuration Standard
Input Current970 milliamps at 5.1 Volts DC, 1.7 milliamps at 24 Volts DC
Thermal Dissipation17.4 BTU per Hour
Power Dissipation5.1 Watts
Slot width1
Weight0.57 pounds (0.26 kilograms)
About

The Allen-Bradley 1756-CNB or ControlNet Bridge module is an interface module used for communicating within a ControlNet network. Compared to the Allen-Bradley 1756-CNBR module, the 1756-CNB uses a standard, or non-redundant, configuration. This module is perfect if the users’ applications have 40 to 48 Logix communication connections per communication module. It has a communication rate of 5 megabytes per second and it has 99 nodes available. The 1756-CNB module handles 2 things, namely the control of I/O data when it is used with a Logix5550 controller for scheduled data and for unscheduled data, bridging data between the ControlLogix backplane and the ControlNet Network. Make sure that the path information is correct in order to properly route the messages it receives.
Up to 64 bidirectional connections with other ControlNet devices can be supported by the 1756-CNB module. It can be a mix of both scheduled and unscheduled connections. However, the number of supported connections also depends on the network configuration. If an application needs more connections, the users can add another 1756-CNB module, but they must make sure to do it in the same chassis and on the same network as the first module. It can also support up to 20 buffers for unconnected messages. It also has 2 ports - 1 ControlNet BNC port and 1 ControlNet RJ45 port. The users need to set the module's node address switches first when installing the 1756-CNB module. They can select a unique node address from 01 to 99. The users can then use the module as a standalone control module by using 1 set of modules or as a redundant control setup by using identical pairs of modules (partners). Note that when using redundant control, the node address switches should have the same node address. The 1756-CNB current draw at 5.1 Volts DC is 970 milliamps and 1.7 milliamps if the current draw is at 24 Volts DC. Its power dissipation is rated at 5.14 Watts.

FAQ

Question: How much power dissipation does the 1756-CNB have?

Answer: The 1756-CNB's power dissipation is 5.14 Watts.

 

Question: How many ports does the 1756-CNB have?

Answer: The 1756-CNB has 2 ports/

 

Question: How many nodes does the 1756-CNB have?

Answer: The 1756-CNB has 99 nodes.

Troubleshooting

The 1756-CNB Series E modules work for all non-redundant ControlLogix applications.
For ControlLogix Redundancy releases 8,11,13, and 15, only Series D of this module is supported. Series E is supported in Redundancy releases 15 and later.

1756-CNB Basic Troubleshooting:

  • Check for fault: icpserv.c line 2068, which indicates a hardware or chassis failure

  • Do a Visual inspection for faulted or damaged components 

  • Check connecting pins 

  • OK light should be flashing 

  • Ensure node addresses are correct in programming as well as on each device

  • Port A will turn green when an adequate connection is made with the ControlNet network 

  • The card should be visible in your ControlNet network ( check revisions for compatibility)

  • Check each ControlNet coax cable as well as all other communications cables for damage 

  • Check literature for LED indicator codes

1756-CNB Testing 

  • Slide the card into the chassis and apply power to the rack 

  • Add the CNB into the processor's backplane

  • Download the file to the processor with the 1756-CNB card added to the backplane

  • I/O OK light will be solid green

  • If you are directly connected to the CNB card it will be visible in RS-Linx along with any other module that is connected to the card with the ControlNet coax cable

Repairs
Type Lead Time Price Action
Repair Service 2-4 weeks $179cartAdd to Cart
Our highly skilled technicians can repair your ControlLogix 1756-CNB. All our repairs come with a 1 Year Warranty. Please contact us for additional information about our repair process.
Type Lead Time Price Action
Repair Service 2-4 weeks $179cartAdd to Cart
Our highly skilled technicians can repair your ControlLogix 1756-CNB. All our repairs come with a 1 Year Warranty. Please contact us for additional information about our repair process.
Revisions

Please refer to the manual for more information about the 1756-CNB such as the wiring diagrams, data sheets, firmware information and migration or obsolescence details.

Revision Part # Also Known as Availability
1756-CNB Ser A
1756-CNB/A, Series A, Rev A Request Quote
1756-CNB Ser B
1756-CNB/B, Series B, Rev B Request Quote
1756-CNB Ser C
1756-CNB/C, Series C, Rev C Request Quote
1756-CNB Ser D
1756-CNB/D, Series D, Rev D Request Quote
1756-CNB Ser E
1756-CNB/E, Series E, Rev E Request Quote

Common misspellings:
  • l756-CNB
  • 1756-CN8
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