Siemens SIMATIC TIM 3V-IE DNP3, System Manual

Page: 204 / 354

The SINAUT Configuration Tool
6.6 TD7onTIM
TIM DNP3
204
System Manual, 12/2015, C79000-G8976-C253-04
Name: Send at change of
Range of val-
ues:
In general: 0 ... 32767
Exceptions:
•
Channel type Command send (Cmd01B_S): 0 or 1
•
Channel type Data send (Dat12D_S): 0 or 1
•
Channel type Setpoint send (Set01W_S / Par12D_S) 0 or 1
Default:
•
For binary value, counted value, data and command channels: 1
•
For mean value and setpoint channels: 0
•
For analog value channels: 270 (1% of the raw value of S7 analog input
modules, 27648 = 100%)
Explanation: In the input box, the value must be entered as an integrated value (an inte-
ger) by which the process value must change so that it is transferred again.
If you enter 0 (zero), the function is deactivated.
How the integration calculation of the threshold value trigger "Send at change of" works with
analog values
To calculate the threshold value trigger, the integration method is used. In the integration
threshold value calculation, it is not the absolute deviation of the process value from the last
transferred value that is evaluated but rather the integrated value of the integrated deviation.
Calculation cycle: 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 integrated value is calculated in every calculation cycle according to the following
formula:
I
N
=
I
O
=
D =
T =
Current integrated threshold value (as a natural number)
Previous integrated threshold value
Amount of deviation of the current process value from the last stored process value
Configured threshold value (Send at change of)
When the amount of the integrated value reaches the value configured for the threshold
value trigger, the trigger is set and a new process value is entered in the send buffer.
The calculated threshold value is shown in the following example.