Transmission Mode Of The Data Points - Siemens SIMATIC RTU3041C Manual

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3 Useful Information

In communication mode, the current value at that time is transmitted.

Event (current value)

If the transmission type "Event" is selected, a threshold (absolute or percentage)

can be specified for each data point. Only if the value of the data point has

changed beyond this threshold is this is evaluated as an event and the new value

stored. New values of a data point overwrite the last stored value.

In communication mode, the last stored value is transmitted.

Event (any value)

All values that differ from the last stored value are stored in chronological order and

transmitted to the communication partner during the communication mode.

Since the HMI does not support the OPC UA function "HistoryRead" and only the

last value is always transferred, this transfer type has no advantage for this

example.

3.2.3

Transmission Mode of the Data Points

If you parameterize "Event (current value)" or "Event (any value)" as the

transmission type, you can additionally select a transmission mode for each data

point.

Figure 3-6: Transmission modes

Table 3-1: Differences between the transmission modes

Transmission mode

Buffered transmission

Unsolicited transfer

Securely Connecting RTU3041C to TeleControl Server Basic

Entry ID: 109739240,

V3.0,

The stored value of the data point is transmitted in the

next communication mode.

A value change of the datapoint (event) starts an

additional communication mode. The data point is

transmitted immediately.

In this application example, this is parameterized at the

memory bit "critFillLevel".

07/2021

Explanation

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