Allen-Bradley 1756-CN2 ControlLogix ControlNet Communication Module
The Allen-Bradley 1756-CN2 is a high-performance ControlNet communication module designed for the ControlLogix platform. It enables deterministic, high-speed data transfer and peer-to-peer communication across industrial automation networks. This module supports up to 128 Logix connections and manages up to 99 nodes on a single ControlNet network, providing reliable connectivity for complex distributed control architectures.
Network Communication and Performance
Operating at a transmission rate of 5 Mbps, the module facilitates real-time data exchange and controller-to-controller messaging. It draws 1100 mA from the 5.1 VDC backplane and 3 mA from the 24 VDC auxiliary power supply, resulting in a total power dissipation of 5.6 W.
Installation and Environmental Requirements
The unit is housed in an open-style chassis format and weighs approximately 0.29 lbs. It is designed to operate reliably within a surrounding air temperature range of 0 deg C to 60 deg C. Proper ControlNet coaxial cabling and correct termination practices are required to maintain signal integrity across the network trunk.
Technical Parameters
| Parameter | Specification |
|---|---|
| Model | 1756-CN2 |
| Brand | Allen-Bradley |
| Communication Protocol | ControlNet |
| Transmission Rate | 5 Mbps |
| Logix Connections | 128 max |
| Maximum Nodes | 99 |
| Backplane Current (5.1 VDC) | 1100 mA |
| Auxiliary Current (24 VDC) | 3 mA |
| Power Dissipation | 5.6 W |
| Operating Temperature | 0 deg C to 60 deg C |
| Weight | 0.29 lbs |
Installation Guidelines
Mount the module into any available slot within a standard 1756 ControlLogix chassis. Use certified ControlNet coaxial cables and ensure both ends of the segment are fitted with proper terminating resistors to prevent signal reflections.
Frequently Asked Questions
Q: What is the primary function of the 1756-CN2 module? A: It acts as a ControlNet interface bridge for ControlLogix controllers, enabling high-speed deterministic data exchange and peer-to-peer communication across distributed automation nodes.
Q: Can the 1756-CN2 support redundant ControlNet media? A: No, the 1756-CN2 is a single-media communication module. For media redundancy applications requiring redundant coaxial channels, the 1756-CN2R model should be used instead.
Allen-Bradley 1756-CN2 ControlLogix ControlNet Communication Module
Allen-Bradley 1756-CN2 ControlLogix ControlNet Communication Module
The Allen-Bradley 1756-CN2 is a high-performance ControlNet communication module designed for the ControlLogix platform. It enables deterministic, high-speed data transfer and peer-to-peer communication across industrial automation networks. This module supports up to 128 Logix connections and manages up to 99 nodes on a single ControlNet network, providing reliable connectivity for complex distributed control architectures.
Network Communication and Performance
Operating at a transmission rate of 5 Mbps, the module facilitates real-time data exchange and controller-to-controller messaging. It draws 1100 mA from the 5.1 VDC backplane and 3 mA from the 24 VDC auxiliary power supply, resulting in a total power dissipation of 5.6 W.
Installation and Environmental Requirements
The unit is housed in an open-style chassis format and weighs approximately 0.29 lbs. It is designed to operate reliably within a surrounding air temperature range of 0 deg C to 60 deg C. Proper ControlNet coaxial cabling and correct termination practices are required to maintain signal integrity across the network trunk.
Technical Parameters
| Parameter | Specification |
|---|---|
| Model | 1756-CN2 |
| Brand | Allen-Bradley |
| Communication Protocol | ControlNet |
| Transmission Rate | 5 Mbps |
| Logix Connections | 128 max |
| Maximum Nodes | 99 |
| Backplane Current (5.1 VDC) | 1100 mA |
| Auxiliary Current (24 VDC) | 3 mA |
| Power Dissipation | 5.6 W |
| Operating Temperature | 0 deg C to 60 deg C |
| Weight | 0.29 lbs |
Installation Guidelines
Mount the module into any available slot within a standard 1756 ControlLogix chassis. Use certified ControlNet coaxial cables and ensure both ends of the segment are fitted with proper terminating resistors to prevent signal reflections.
Frequently Asked Questions
Q: What is the primary function of the 1756-CN2 module? A: It acts as a ControlNet interface bridge for ControlLogix controllers, enabling high-speed deterministic data exchange and peer-to-peer communication across distributed automation nodes.
Q: Can the 1756-CN2 support redundant ControlNet media? A: No, the 1756-CN2 is a single-media communication module. For media redundancy applications requiring redundant coaxial channels, the 1756-CN2R model should be used instead.
