AB Cat. No. 1785-CHBM ControlNet PLC-5 Hot Backup System

AB Cat. No. 1785-CHBM ControlNet PLC-5 Hot Backup System 

Hardware Specification Advantages

Strong processor adaptability: Support 1785-L40C15 or 1785-L80C15 and other models of PLC-5 processor, Series F, Revision A or higher versions, which can meet the needs of different industrial scenarios on processor performance and functionality. Whether you have a small production facility or a large industrial production line, you can find the right processor configuration to ensure stable system operation.

Highly Integrated Backup Card Functions: The 1785-CHBM/A ControlNet Backup Card not only provides backup functions, but also has 100K words of non-volatile memory, which can be used as a standard PLC-5 EEPROM memory storage cartridge. This makes the system more convenient for data storage and backup, reducing the need for additional hardware and lowering system costs.

Environmentally friendly: The system's hardware is capable of operating at operating temperatures from 0 - 60°C and storage temperatures from - 40 - 85°C, with a relative humidity range of 5 - 95% (non-condensing). It is also stable in vibration (2g @10 - 500Hz) and shock (30g operational, 50g non-operational) environments. This makes it suitable for use in complex industrial environments such as high temperature, high humidity, and vibration-prone production plants.

Communication Advantages

Efficient and stable network communication: Based on the ControlNet network, system communication is stable and efficient. The network update time (NUT) range of 2 - 100ms provides a reliable time guarantee for data transmission. In industrial production, a large amount of real-time data needs to be transmitted quickly and accurately, and the system meets this need, ensuring that the data interaction between the master and backup controllers and the I/O devices is timely and error-free.

Flexible Communication Configuration: Supports redundant connections, allowing the main and backup processors to establish connections with I/O devices at the same time, and can automatically recognise and use the output of the main processor. This configuration improves the reliability of the system, even if the main processor fails, the backup processor can quickly take over the control to ensure that the production process is uninterrupted. Users can also select synchronous or asynchronous program scanning modes to suit different application scenarios.

Functionality Advantages

Fast switchover to ensure production continuity: The system is equipped with a fast switchover function, in the event of a failure of the main controller, the backup controller can complete the switchover and take over control within 30 - 50ms. This feature is crucial for industrial production that requires high production continuity, such as chemical and electric power industries, which can effectively reduce the production interruption time caused by controller failure and reduce economic losses.

Perfect data synchronisation mechanism: Through the data table cross-loading function, the system ensures that the data table values of the main and backup processors are as close as possible. After the backup system qualification is completed, automatic data table cross-loading can be carried out, and on-demand data table cross-loading is also supported, including timer accumulators, counter accumulators, PD files, and user-selectable files. This mechanism effectively reduces system instability caused by data differences and improves system control accuracy.

A variety of configuration options to meet individual needs: There are a wealth of configuration options, such as designating a master controller, equivalence checking, recertifying dual-master programmable controllers and so on. Users can flexibly adjust the system configuration according to the actual application requirements to ensure that the system can achieve the best performance in different working scenarios. In some industrial scenarios that require high security and stability, a designated master controller can be configured to ensure the stable operation of key equipment.

Diagnostic and Maintenance Advantages

Comprehensive troubleshooting capabilities: The system's powerful diagnostic capabilities, via status indicators on the 1785-CHBM backup card, master fault codes (stored in the processor status file S:12), and the ControlNet backup configuration and status file (accessible directly via the Ladder Logic and Data Monitor, or indirectly via the Hot Standby Utility in RSLogix 5), enable timely and accurate detection and location of faults. The ControlNet backup configuration and status files (accessible directly through ladder logic and data monitors, or indirectly through the hot standby utility in RSLogix 5) enable timely and accurate fault detection and location. When a system failure occurs, technicians can quickly use this diagnostic information to troubleshoot and repair the problem, reducing system downtime.

Convenient maintenance and management: During system operation, the system can be monitored and managed online through software such as RSLogix 5. For example, you can view the system status in real time, modify configuration parameters, and cross-load data tables. This convenient maintenance and management method improves the maintainability of the system and reduces maintenance costs.

Compatibility Advantage: The system has good compatibility with hardware and software. In terms of hardware, it supports many types of I/O.

System Overview

Purpose: Improve equipment running time, reduce costs due to equipment failure, guarantee high availability of control applications, and ensure the continuity of the production process.

Architecture: Consists of a pair of PLC-5/40 or PLC-5/80 ControlNet programmable controllers (Series F, Revision A or higher), two 1785-CHBM/A ControlNet Backup Cards, two 1771 Chassis, two 1771 Power Supplies, one or more ControlNet I/O Adapters, ControlNet network cables and associated software components.

Principle of operation: The primary PLC-5 controller controls the ControlNet I/O, and the backup PLC-5 controller takes over control in the event of a primary controller failure. Through the ControlNet network, the controllers communicate with each other and exchange status information to achieve the backup function.

Installation Configuration

Hardware Installation: Set the ControlNet node address of the PLC-5 processor (consecutive and odd first), install the processor, backup card, power supply, connect to the ControlNet network, and finally set the key switch to the Program mode and turn on the power.

System Configuration: There are two types of configurations: same application and different application, both of which need to reconfigure the ControlNet I/O, set up handshake messages, save the configuration and set up the hot standby parameters.

Advanced Configuration Options: Including synchronous and asynchronous programme scanning, equivalence checking, data cross loading, forced switching, system status checking, etc., which can be selected and configured according to requirements.