Problems Resolved by This Firmware Release (8.40)
Time-of Day (TOD) Clock Start-up Problem on CPU331 and CPU341
In some cases, if the backup battery was disconnected after the CPU was powered down, the TOD clock
would not restart when the PLC was powered back up. This would result in a fatal fault being logged that
identified the failure of the TOD clock. Subsequent cycling of power would not cause the clock to restart. It
could be restarted, however, by removing the CPU and shorting the “super capacitor” memory backup
capacitor. This problem has been corrected in firmware release 8.40. (Note that CPUs 311, 313, and 323 do
not have a TOD clock.) Users with earlier versions of CPU331 or CPU341 who experience this problem are
advised to upgrade these CPUs to firmware release 8.40 (see the heading “Firmware Upgrade Kits”).
Problems Resolved by Prior Firmware Release 8.21
FBC Editing with Hand Held Programmer (HHP)
A soft alarm fault could occur in release 8.20 when editing an FBC configuration with a hand held
programmer. This problem has been corrected in release 8.21.
Storing Foreign Module Configuration to Slot 1
Storing a configuration with a foreign module in slot 1 (possible only on 311, 313, or 323) would result in a
fatal fault in release 8.20. This has been corrected in release 8.21.
End Function Block
The End Function Block no longer terminates a sweep if it is in a subroutine. It merely exits the subroutine.
This restores the functionality as it was prior to release 8.
SVC REQ 7 previously would allow an invalid date, such as 2/29/01 to be entered. Dates with a day number
greater than is legal for the specified month is no longer allowed as input to SVC REQ 7.
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