Analog Value Preprocessing - Siemens TIM 1531 IRC Operating Instructions Manual

Integrative method
The integration threshold value calculation works with a cyclic comparison of the integrated
current value with the last stored value. The calculation cycle in which the two values are
compared is 500 milliseconds.
(Note: The calculation cycle must not be confused with the scan cycle of the CPU memory
areas).
The deviations of the current process value are totaled in each calculation cycle. The trigger
is set only when the totaled value reaches the configured value of the threshold value trigger
and a new process value is entered in the send buffer.
The method is explained based on the following example in which a threshold value of 2.0 is
configured.
Table 4- 7
(calculation cycle)
With the change in the process value shown in the example, the threshold value trigger
configured with 2.0 is initiated twice:
● At the time 3.5 s: The value of the integrated deviation is at 2.0. The new process value
stored in the send buffer is 20.5.
● At the time 6.0 s: The value of the integrated deviation is at 2.1. The new process value
stored in the send buffer is 19.9.
In this example, if a deviation of the process value of approximately 0.5 should fire the
trigger, then with the behavior of the process value shown here a threshold value of
approximately 1.5 ... 2.5 would need to be configured.
4.22.8

Analog value preprocessing

The TIM supports analog value preprocessing. For analog value data points, some or all of
the functions described below can be configured.
TIM 1531 IRC
Operating Instructions, 02/2018, C79000-G8976-C468-02
Example of the integration calculation of a threshold value configured with 2.0
Time [s] Process value
stored in the
send buffer
0 20.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5 20.5
4.0
4.5
5.0
5.5
6.0 19.9
Current process Absolute deviation
value from the stored
20.0
20.3
19.8
20.2
20.5
20.3
20.4
20.5
20.4
20.1
19.9
20.1
19.9
Configuration
4.22 Data points
Integrated devia-
tion
value
0 0
+0.3 0.3
-0.2 0.1
+0.2 0.3
+0.5 0.8
+0.3 1.1
+0.4 1.5
+0.5 2.0
-0.1 -0.1
-0.4 -0.5
-0.6 -1.1
-0.4 -1.5
-0.6 -2.1
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