User Manual

Siemens Building Technologies VISONIK DCS Functions and System Messages VVS18 CM2U8567E / 04.1999
Landis & Staefa Division Function PRR 2-235
The explanations for 'Positive Edge' equally apply. The line with edge 12 thus stands
for:
ERSTA ---> ... ERSTA Triggering of a response, if the error status ERSTA
changes from any value to a predefined
value.
The previously mentioned predefined value (OPSTA, ERSTA, Main value) must be
entered upon a prompt.
Positive and negative edges must be combined following rules:
–
When choosing positive edge 13 ( ---> Main value), no negative edge is available.
–
When choosing positive edge 11 ( ---> OPSTA), the selection for a negative edge is
restricted to (no response) or 11 (OPSTA ---> )
–
The same applies to choosing positive edge 12 ( ---> ERSTA)
Depending on the selection of the positive and negative edge, the respective values are
requested here. Examples:
•
Lower / upper limit
•
Alarm status
•
Operating state
•
Main value
If the operating mode OPMO of the data point triggering the reaction is set such that the
reaction is not executed, the following message will be displayed:
WARNING : OPMO!! OPMO! Limit without Function
If the points types AI, VIP, CI and AO are used as "reasons", customized pairs of limits,
which the VISONIK DCS treats with higher priority than the lower/upper limits set in the
parameters LOL/HIL, can be defined in the reaction entry.
This allows any desired limits for any reactions to be assigned to a point of this kind.
If the value goes out of limits, a process reaction corresponding to the "edge" is
executed. If the limits are not specified in the reaction entry, the values of the point
parameters LOL/HIL apply.
The statements made under "lower limit" in the above apply analogously.
Definition of additional conditions (blocking flag)
A flag point with address and value(s) can be assigned to each reaction entry.
This blocking flag constitutes an additional condition that must be fulfilled before the
reaction is executed.
A reaction entry is said to be blocked if the current value of the flag does not correspond
to a value belonging to the entry.
Blocking Flag=. : $F10
Flag Value =Off : ?
Flag Value =(&,.,*,-,+=,-=,Off,Step 1,Step 2,Step
A specific value or a combination of several values can be entered for the flag value.
In the above example, the reaction entry is executed only if the "reason" is fulfilled and
flag $F10 has the value 1,Step or 2,Step at that time.
In all other cases the reaction entry is blocked, and the reaction is not executed.
Definition of the reaction to be executed
The following reactions can be triggered via a process reaction entry:
Note
Lower limit
OPMO must be set
correctly!
Limit pair independent of
LOL and HIL
Upper limit
Blocking flag
Flag value