Acknowledgment; The Wake-Up Sms - Siemens S7-1200 TELECONTROL Operating Instructions Manual
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Configuration and operation
4.6 Acknowledgment
● Connections with direct communication (Open User Communication) and S7
communication
Connections are established as soon as the corresponding program blocks are called on
the CPU.
This also applies to the situation when a different S7 station sends data. In this case, the
corresponding receive blocks are called by the receiving station.
4.6
Acknowledgment
Acknowledgment of frames
The receipt of a frame is monitored and acknowledged in different ways. The mechanisms
differ depending on the type of communication:
● Telecontrol communication
Frames received from TCSB are acknowledged immediately by the CP.
Frames sent by the CP are acknowledged by TCSB.
● Inter-station communication
Received frames are acknowledged immediately by the CP. The acknowledgment frame
is forwarded by the telecontrol server to the destination CP.
For sent frames, this applies in the opposite direction.
● Direct communication (Open User Communication)
The successful sending and receipt of frames is indicated by status displays of the
program blocks.
With TCP segments, the protocol-specific acknowledgement mechanisms are used.
4.7
The wake-up SMS
Right to wake-up by "authorized phone numbers"
The CP only accepts an SMS if the sending communication partner is authorized based on
its phone number. These phone numbers are configured for the CP in STEP 7 in the
"Authorized phone numbers" list in the Security settings.
"Authorized phone numbers" in the STEP 7 project
● A phone number entered here gives the sender who transfers this phone number the right
to trigger connection establishment.
● If only an asterisk (*) is entered in the list, the CP accepts SMS messages from all
senders.
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Operating Instructions, 10/2016, C79000-G8976-C311-02
CP 1242-7 GPRS V2
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