2541 Redundant Processor Manager Module
The 2541 Redundant Processor Manager (RPM) provides an automatic backup solution for CTI 2500 Series® or Simatic® 505® Programmable Controllers. If the active processor fails, the RPM will automatically switch the remote I/O to the standby processor. Transfer to the standby processor is bumpless. All remote I/O updates are mirrored to the standby processor. In addition, up to 4096 words of user-defined critical data can be transferred from the active processor to the standby processor 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.