The table below describes the properties of the communication program:
Location Features Sending station - Precisely 1 connection is configured per receiving station
- The communication program runs in the OB1 cycle
- A complete data block is always sent; i.e. one call per job
- A data block is always used as data sourceReceiving station - The communication program runs in the OB1 cycle
- A complete data block is always received
- The received data block is always stored in a data module
Note:
The above properties have the following consequences
- The maximum number of receiving stations is limited by the number
of connection resources and communication service (e.g. CP 343-1 lean: 8)
- The maximum length of the data block is the maximum length of the communication
block and the communication service possible (e.g. for TSEND: 1452Bytes for S7-300)