Image is for illustrative purposes only. Please refer to product description.
- Manufacturer
- Allen-Bradley
- Manufacturer part number
- 1756-CNBR
- Product family
- ControlLogix Communication Modules (1756)
- Technical datasheet
- Data sheet
Specifications
| Attribute | Value |
|---|---|
| Type | ControlNet communication module |
| Manufacturer lifecycle | Discontinued |
| OEM successor | 1756-CN2R |
| Communication | ControlNet |
| Connection Cables | 1 m Tap |
| Interface | 1 |
| Conducted RF immunity | 10V rms with 1 kHz sine-wave 80% AM from 150 kHz...80 MHz |
| Connections supported, max | 64 maximum |
| ControlNet cable | 1786-RG6 quad shield RG6 coaxial cable |
| ControlNet port | 2 ControlNet BNC |
| Current draw | 970mA @ 5.1V DC, 1.7mA @ 24V DC |
| EFT/B immunity | ±3kV @ 5kHz on ControlNet ports |
| Emissions | CISPR 11: Class A |
| Enclosure type rating | None (open-style) |
| ESD immunity | 6 kV contact discharges, 8 kV air discharges |
Show all 37 specificationsShow fewer specifications
| Isolation voltage | Standard: 30V (continuous), basic insulation type, ControlNet network to, backplane, Redundant: 30V (continuous), basic insulation type, ControlNet A/B to, backplane, and ControlNet A to ControlNet B, USB to backplane and USB to ControlNet, No isolation b |
|---|---|
| Logix communication connections range | 40...48 |
| Module location | Chassis based, any slot |
| NAP cable | 1786-CP |
| NAP port | 1 NAP RJ45 |
| Number of nodes, max | 99 nodes |
| Operating temperature | 0 to 60 °C |
| Power dissipation | 5.1 W |
| Radiated RF immunity | 10 V/m with 1 kHz sine-wave 80% AM from 80...2000 MHz, 10 V/m with 200 Hz 50% Pulse 100% AM @ 900 MHz, 10 V/m with 200 Hz 50% Pulse 100% AM @ 1890 MHz, 3 V/m with 1 kHz sine-wave 80% AM from 2000...2700 MHz |
| Redundancy | Yes |
| Relative humidity | 5...95% noncondensing |
| Shock | Operating: 30 G, Non operating: 50 G |
| Slot width | 1 |
| Storage temperature | -40 to 85 °C |
| Supporting protocol for other bus systems | Yes |
| Surge transient immunity | ±2 kV line-earth (CM) on ControlNet ports |
| Surrounding air temperature, max | 60 °C |
| Thermal dissipation | 17.4 btu/h |
| Transmission rate | 5000 kbps |
| Vibration | 2 G @ 10...500 Hz |
| Weight, approx | 0.293 kg |
| Wiring category | 1 - on ControlNet ports, 3 - on NAP ports |
Description
The Allen-Bradley 1756-CNBR is listed by Rockwell Automation as a ControlLogix Communication Module for ControlNet. Rockwell's product data gives a transmission rate of 5000 kbps, a maximum of 99 nodes and a maximum of 64 connections supported. It has two ControlNet BNC ports and one NAP RJ45 port, and Rockwell lists a current draw of 970mA @ 5.1V DC and 1.7mA @ 24V DC. Rockwell shows the lifecycle status as Discontinued and names the 1756-CN2R as its replacement, in the category Engineering Replacement.
Application: Communication module
Used with: ControlLogix 1756 chassis
What is the 1756-CNBR used for?
The module connects a ControlLogix chassis to a ControlNet network. Rockwell lists it as chassis based, fitting any slot and taking one slot width, with redundancy supported. It is used where a ControlLogix controller needs to communicate with other devices over ControlNet.
Key features
- Two ControlNet BNC ports plus one NAP RJ45 port
- Redundancy supported, according to Rockwell's product data
- Up to 99 nodes and 64 connections
- Chassis based, any slot, one slot wide
- Operating temperature range of 0 to 60 °C
Documents and Resources
OEM successor to 1756-CNBR
1756-CN2R is named by Allen-Bradley as the successor. It is an upgrade, not a like-for-like spare: check wiring, I/O and configuration for your installation before ordering it. Contact sales@timcontrols.com if you need one.
Associated Products
| Image | Product | Description | Stock | View | Add to RFQ |
|---|---|---|---|---|---|
 | 1756-CN2Allen-Bradley | ControlLogix ControlNet interface module, BNC | In stock | View | |
 | 1756-CN2RAllen-Bradley | ControlLogix ControlNet redundant interface module | In stock | View | |
 | 1756-CN2RXTAllen-Bradley | ControlLogix ControlNet redundant interface module, XT | In stock | View | |
 | 1756-CNBAllen-Bradley | ControlLogix ControlNet communication module, 1 BNC | In stock | View | |
 | 1756-DNBAllen-Bradley | ControlLogix DeviceNet bridge and scanner module | In stock | View | |
 | 1756-EN2FAllen-Bradley | ControlLogix EtherNet/IP module, 100 Mbps multimode fiber | In stock | View | |
 | 1756-EN2TAllen-Bradley | ControlLogix EtherNet/IP communication module, 10/100 Mbps | In stock | View | |
 | 1756-EN2TRAllen-Bradley | ControlLogix EtherNet/IP module, dual port 10/100 Mbps | In stock | View | |
 | 1756-EN2TXTAllen-Bradley | ControlLogix EtherNet/IP module, extended temperature | In stock | View | |
 | 1756-EN3TRAllen-Bradley | ControlLogix EtherNet/IP module, dual port copper | In stock | View | |
 | 1756-ENBTAllen-Bradley | ControlLogix EtherNet/IP communication module, 10/100 Mbps | In stock | View | |
 | 1756-CN2RKAllen-Bradley | ControlLogix Redundant ControlNet Module, Conformal Coated | In stock | View |
Product Questions
Is the 1756-CNBR discontinued?
Yes. Its manufacturer lifecycle status is Discontinued.
Is there a replacement for the 1756-CNBR?
The 1756-CN2R is named by Allen-Bradley as the successor. It is an upgrade, not a like-for-like spare: check ratings, wiring and configuration before ordering it in its place.
Do you ship worldwide?
Yes. TimControls ships worldwide. Parts usually ship within 3 to 7 working days of order confirmation, and the exact lead time and shipping options are stated on your quote. Include your delivery country and postal code when you ask for a quote.
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