Siemens SIMATIC NET S7-1200 - Configuring Messages

Configuration and operation
5.8 Notes on configuring individual functions
CP 1243-1 DNP3, CP 1243-1 IEC
Operating Instructions, 02/2014, C79000-G8976-C312-02
55
Table 5- 4 Example of the integration calculation of a threshold value configured with 2.0
Time [s]
(calculation
cycle)
Process value
stored in the send
buffer
Current process
value
Absolute deviation
from the stored
value
Integrated
deviation
0
20.0
20.0
0
0
0.5
20.3
+0.3
0.3
1.0
19.8
-0.2
0.1
1.5
20.2
+0.2
0.3
2.0
20.5
+0.5
0.8
2.5
20.3
+0.3
1.1
3.0
20.4
+0.4
1.5
3.5
20.5
20.5
+0.5
2.0
4.0
20.4
-0.1
-0.1
4.5
20.1
-0.4
-0.5
5.0
19.9
-0.6
-1.1
5.5
20.1
-0.4
-1.5
6.0
19.9
19.9
-0.6
-2.1
In this example, a value of 2.0 was configured for the threshold value trigger.
With the changes in the process value shown in the example, the threshold value trigger
fires 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.
5.8.7
Configuring messages
Configuring e-mails
If important events occur, the CP can send e-mails to a communications partner.
You configure the e-mails in STEP 7 in the Data point and alarm configuration. You can find
this using the project tree:
Project > directory of the relevant station > Local modules > CP 1243-1
For the view in STEP 7, refer to the section Configuring datapoints and messages (e-mails)
(Page 33).