4. Procedure and Details of Upgrade
4-16
TI 33K01B10-50E
Computer Backup Mode of CENTUM-XL and CENTUM VP
The computer backup mode (CBM / CBA / CBC mode) of CENTUM-XL is equivalent to that of
CENTUM VP, but the way of transition differs between them.
In CENTUM-XL, the current mode will shift to the CBM / CBA / CBC mode which is independent
from any of the MAN / AUT / CAS modes.
In CENTUM VP, every mode is a compound mode and either of the RCAS / ROUT modes and
any of the MAN / AUT / CAS modes can effect concurrently.
CENTUM-XL performs WDT communication with the supervisory computer, and the system
switch %SW0064 will be turned to ON if the supervisory computer fails (FAIL).
When %SW0064 is turned to ON, the system will change into the computer backup mode (CBM
/ CBA / CBC mode). However, CENTUM VP has no such corresponding function, it is necessary
to newly build an equivalent application.
Where there is an application which has been changed into the SPC / DDC mode with CENTUM-
XL, and if it performs WDT communication with the supervisory computer, re-examination
whether the mode judgment on the tag of CENTUM VP is equivalent is required.
Customer is requested to conduct a dynamic test with the supervisory computer taking also the
operation into account.
(When this dynamic test cannot be performed with any supervisory computer, an appropriate test
method shall be discussed in the consultation.)
Correction of the subject part shall be carried out only after close discussion with the customer.
Example: Where the judgment condition is “Not AUT” in the sequence table of CENTUM-XL, the
condition is met when the tag mode is CBA. However, where the judgment condition is “Not
AUT” in the sequence table of CENTUM VP, even the same condition is not met if the tag
mode is RCAS(AUT).
Mar. 27, 2015-00
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