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The 2541 Redundant Processor Manager (RPM) provides an automatic backup solution for 2500 Series® PLCs. If the active PLC fails, the RPM will automatically switch the remote I/O to the standby PLC. Transfer to the standby PLC is bumpless. All remote I/O updates are mirrored to the standby PLC. In addition, up to 4096 words of user-defined critical data can be transferred from the active PLC to the standby PLC every scan. Other non-critical data can be transferred over several scans. The RPM can also switch up to two serially attached operator interface devices.
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