Limit Value Alarms (S94 To S100, S267 To S268) - Siemens SIPART DR22 Manual

1 Technical Description
1.5 Functional description of the structure switches

1.5.9 Limit value alarms (S94 to S100, S267 to S268)

1.5.9 Limit value alarms (S94 to S100, S267 to S268)
Every limit value alarm A1, A2, A3, A4 is assigned by the structure switches S94, S95, S267,
S268 to the controller-internal variables xdI, xI to FE12.
With S267 = --1 or S268 = --1 (factory setting), the limit value alarms A1, A2 or A3, A4 are
combined as pairs.
In this case the assignment only takes place with S94 or S95, only hysteresis' H1.2 or H3.4 are
active.
With S96 (A1, A2) or S97 (A3, A4) the monitoring function Max/Min, Min/Min, Max/Max,
Min/Max can be set.
The response thresholds A1 to A4 and the hysteresis H1.2, H3.4, H2., H4. can always be set in
the structuring mode oFPA. According to the switch position of S98 only the display or the dis-
play and adjustment of A1 to A4 is possible in the process operation level.
In this case the switching cycle of the Shift key (12) is extended by the response thresholds A1
to A4, displayed on the y-display (14):
Controller I -- Controller II - A1 - A2 - A3 - A4 -- Controller I ...
The response thresholds are set depending on the assignment physically corresponding to the
display format of the digital x or w display (see chapter 1.5.4, page 40) or in %:
S94, S95
S1
S267, S268
0
1
≠4
2
≠6
0
1
4
2
and
3
6
4
5 5
to 6
12 7
0 8
to
#
12 37
Table 1-20 Display format of the limit values A1 to A4
The hysteresis H1.2, H3.4, H2., H4. is set in % in the range from 0.1 to 20 %.
The function of the limit values (Min oder Max) always relates to the display, i.e. in the case of a
falling characteristic (dE*<dA*) the direction is reversed. The set Min function for example
becomes a Max function related to the field signal.
124
assigned to Display format
xdI according to
xI
-1999 to 19999
wI
xdI
xI
wI
xv according to
-1999 to 19999
wv
xdII according to
xII dAII bis dEII
-1999 to 19999
wII
y
#
FE12
maximum -110 % to +110 %
dAI bis dEI related to
dEI - dAI = 100 %
%
%
-110 % to +110 %
% maximum -110 % to
+110 % related to
dAI bis dEI dEI - dAI = 100 %
maximum -110 % to
110% related to dEII
% -110 % to +110 %
SIPART DR22 6DR2210
C79000-G7476-C154-03
Manual
Parameter range
- dAII = 100 %