WOODWARD 5501-469 REV C NETCON 5000 programmable logic controller CPU module

On-site diagnosis and firmware upgrade of service port 1 dedicated maintenance interface

CAN bus port 2can2.0b standard field device network and driver control

Among these interfaces, * * Real-time Network Port (RTN)** is of special importance. It adopts special protocol and hardware acceleration mechanism to ensure the deterministic transmission of key control data, and the typical delay is on the microsecond level. RTN port plays a key role in system expansion, which is used to connect remote I/O racks and realize distributed control architecture. The two CAN bus ports provide a highly reliable connection option for the field-level equipment network, which is especially suitable for integration with motion control equipment such as frequency converters and servo drivers.

System configuration and network architecture

Hardware configuration and initialization settings

The hardware configuration of TMR5200 CPU module is mainly completed by module configuration switch (S2), which is located at the side or back end of the module and adopts the DIP dip switch form. At the factory, the module has been preconfigured in the main frame mode (address 0x000), which is the basic configuration of the standard triple redundant system. When deployed in the field, technicians need to verify the following key configuration parameters:

Rack location identification: In a multi-rack system, each CPU module must be correctly configured with its physical location identification to ensure that the redundant voting mechanism works correctly.

Clock synchronization source selection: In the TMR system, the clocks of the three CPU modules must be strictly synchronized, and the configuration switch needs to specify the main clock source and the standby clock source.

Boot mode setting: choose to boot from flash memory or network, which is usually used in system debugging and software update scenarios.

It is worth noting that the IP address of the real-time network (RTN) communication port of the module adopts the fixed 172.20.x.x series address, which is Woodward's special industrial control network address space, which helps to reduce the address conflict with the customer's enterprise network. This pre-configuration simplifies the initial installation process and provides a predictable network topology foundation for the system.

Design and Implementation of Network Architecture

The industrial control system network based on TMR5200 usually adopts hierarchical architecture design to realize the management of control data and information data;

Real-time control network layer: it is constructed by special RTN port to form a closed deterministic real-time communication ring network, which is dedicated to transmitting key process control data and system synchronization information. The network has strict bandwidth reservation and low delay characteristics to ensure the timing accuracy of the control loop.

Factory information network layer: connected by two general Ethernet ports (ENET1, ENET2), used for integration with upper monitoring system (such as SCADA), engineering workstation and enterprise information system. These two ports can be configured in redundant mode to improve communication reliability.

Field device network layer: connected through CAN bus interface, a field-level network oriented to sensors and actuators is constructed, which is especially suitable for the access of distributed I/O and intelligent devices.