A-B 1756-CN2R is a communication module for Allen-Bradley,also known as Rockwell Automation’s ControlLogix controller platform.The following is a detailed introduction to the module:
1.Main functions
It is mainly used to build a ControlNet network in the ControlLogix system to achieve real-time communication between multiple devices.
It provides ControlNet networks through the Common Industrial Protocol(CIP)and peer-to-peer networks,and has enhanced functions.
2.Technical specifications
Interface:2 ControlNet BNC ports(supporting 5 Mbps),1 USB communication port(supporting 12 Mbps).Some materials also mention 1 ControlNet RJ45 port,but not all descriptions include this port,which may vary depending on the product version or configuration.
Network topology:Supports multiple topologies such as linear,star,and tree.
Number of nodes:Supports up to 99 nodes(some materials mention that up to 128 Logix communication connections and 131 communication connections can be supported,but 99 nodes are a common limitation of ControlNet networks).
Data rate:5 Mbps.
Power supply:5.1V DC or 24V DC.
A-B 1756-CN2R
Other parameters:
Current draw is 1300mA at 5.1V DC and 3mA at 24V DC.
Dissipates 6.6W(or 6.7W,depending on the material)of heat at 22.5 BTU/hr(or 22.9 BTU/hr,depending on the material).
Has 30V DC isolation voltage and basic insulation tested at 500V for one minute between ControlNet and the system.
III.Features and Benefits
High-speed communication:Provides high-speed data transmission to meet the needs of real-time control.
High reliability:Supports redundant configuration to improve network reliability.
Flexibility:Can be installed into any available slot of a standard chassis,such as 1756-A4,1756-A7,etc.,and used with a standard ControlLogix power supply.
Scalability:Suitable for implementing distributed I/O topologies,can cover 1000 meters per segment,and can be easily expanded by using repeaters as signal boosters for control network segments over 1000 meters.
Compatibility:Can communicate with human-machine interface(HMI)devices and supervisory control and data acquisition(SCADA)systems.
A-B 1756-CN2R
IV.Application scenarios
A-B 1756-CN2R communication module is widely used in various industrial automation control systems,such as production line automation,mechanical equipment control,process flow management,etc.It can realize real-time communication and data exchange between devices,and improve production efficiency and quality.
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