Configuration and operation
4.11 Acknowledgment
CP 1243-7 LTE
Operating Instructions, 01/2015, C79000-G8976-C381-01
55
4.11
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.
4.12
Calling a TeleService connection
Requirement for the engineering station and the STEP 7 project
●
The STEP 7 project with the CP is stored on the engineering station.
●
The required configuration steps have been performed, see section Configuration of the
TeleService access (Page 45).
Requirement for connection establishment
The request for connection establishment is triggered by the engineering station. The
connection is established by the CP.
With TeleService via the mobile wireless network, a switching station is required between the
remote station and engineering Station, see section Requirements for operation (Page 19).
This switching station can be a telecontrol server or, if there is no telecontrol server in the
configuration, a TeleService gateway.
For documentation of the two systems, refer to Documentation references (Page 129).