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SIMATIC VPU200/560 Programming Manual
Function 82: Function 82 ("Hot Back-Up") is used for examining or
modifying the HBU status. After Function 82 is selected, a menu is
displayed. The following illustration contains sample entries that may
appear.
This menu displays the current status of the active and standby units and
provides the function keys to change status. In addition, if the standby unit
is offline, one of the following messages is displayed to give the reason.
State entered at power-up
Offline due to Hardware Mismatch
Offline due to User Command
Offline due to Active unit in PROGRAM mode
Offline requesting online but inhibited by user program in active unit
Offline due to failure in Standby
Offline due to loss of HBU Communications.
Appendix A provides a listing of communication error messages that are
given when a communication error occurs with a Hot Back-up unit
connected.
Using VPU200 Support Functions
9-13
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