User Manual

CM2U8567E / 04.1999 VISONIK DCS Functions and System Messages VVS18 Siemens Building Technologies
2-90 Function DPO Landis & Staefa Division
If a parameter status change occurs (Event) within a logging interval, the 'Validity
Marker' is recalculated. The relative NEv marker for No Event is reset to "0" and the
message "Evt" is output.
If there is no event in the respective interval the marker remains at "1" and message
"NEv" is given.
This marker appears if parameter OSV for the related point has been set
to YES.
This "NoV" marker mainly appears if some time manipulations have been made. Events
having delays of more than one hour with respect to the system time result in loss of
data which is indicated in the System by message "Statistics Data lost!".
As an example, if the system time must be redefined after a power failure of more than
one hour, measurements are missed out because of this time shift.
"NoV" is also marked for a recorded point, when;
–
!SU: (the point is suppressed)
–
OPMO=PSe or PSfe: (OPMO is set to no Events)
–
?EO: (No Events because EPRI=0)
This fault is related to
•
PS DOWN
•
RING DOWN
•
MODULE DOWN
•
Usable Range exceeded.
Only the worst condition is displayed for Validity Marker texts,
i.e., in the B7 --> B2 sequence.
Example
:
If the following Validity-Marker error message appears,
B0, B4 , B7, assigned flag value = 2.
then the Validity Marker appears as follows when listed:
Tabular Format Long Format
-------------- -----------
22.8 (91) ! 22.8 (?HW) 2
| |
| |
(1+10+80) Flag value
is set in Flag Point
(see section GEN)
2.11.9.1 Validity Marker for Instantaneous Values
Logging Intervals 1, 5, 10, 30 and 60 Minutes
1. If a parameter status change occurs (Event) inside one of these logging intervals,
the 'Validity Marker' is recalculated every time, that is,
Validity Marker =
Evt
2. If no event occurs in the interval, the marker remains and
Validity Marker =
NEv
3. If a fault or limit violation occurs within a logging interval then this fault together
with its specific Validity Marker are copied into subsequent values until a new
Validity Marker is calculated on the next Event.
B4 --> Evt
(No Event)
B4 --> NEv
B5 --> OSV
(OSV Out of Service)
B6 --> NoV
(No value)
B7 --> HW
(HW Trouble)
Note: