Rslogix 500 81000 Cpr9 W Master Disk Verified -

A master disk is a type of storage device that contains a complete and verified copy of a control program. In the context of RSLogix 500, a master disk is used to store the program and configuration data for a PLC. The master disk serves as a backup of the program and can be used to restore the PLC to its original configuration in case of a failure or error.