4. Procedure and Details of Upgrade
4-15
TI 33K01B10-50E
Backup Mode of CENTUM-XL and Tracking Mode of CENTUM VP
The backup mode (BUM mode) of CENTUM-XL is equivalent to the tracking mode (TRK mode)
of CENTUM VP, but the way of transition differs between these modes.
In CENTUM-XL, the current mode will shift to the BUM mode from any of the MAN / AUT / CAS
modes independently.
In CENTUM VP, every mode is a compound mode and both the TRK mode and any of the MAN/
AUT/CAS modes can effect concurrently.
In CENTUM-XL, any application which uses the local / remote switchover contact input (RL
terminal) or has been shifted to the BUM mode according to the sequence, it is necessary to re-
examine whether the mode judgment on the tag of CENTUM VP is equivalent or not.
Customer is advised to conduct a dynamic test taking also the operation into account.
Correction of the subject part shall be carried out only after close discussion with the customer.
MAN
AUT
CAS
BUM
(AUT)
(MAN) (CAS)
<Block mode diagram: CENTUM-XL>
<Block mode diagram: CENTUM VP>
TRK (*1)
TRK (*1) TRK (*1)
Figure Difference in the block mode
*1: On CENTUM VP, both the TRK mode and any of the MAN/AUT/CAS modes can effect concurrently.
Example: Where the judgment condition is “Not AUT” in the sequence table of CENTUM-XL, the
condition is met when the tag mode is BUM. However, where the judgment condition is “Not
AUT” in the sequence table of CENTUM VP, even the same condition is not met when the
tag mode is TRK(AUT).
Mar. 27, 2015-00
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