Block library TeleControl ST7
5.7 Master copies
TIM 1531 IRC
260 Operating Instructions, 02/2018, C79000-G8976-C468-02
S7-400
Instance data block for the communication block FB BCom. The instance DB represents the
communication mailbox and contains the following, among other things:
● The receive mailbox (ReceiveBuffer)
● A send mailbox (SendBuffer)
It also contains central data required to control and manage the PBK connection that runs
via this mailbox.
The data block is required in every CPU in which FB BCom is used. If the CPU has several
PBK connections the DB is required more than once.
DB BComData is automatically generated in the required length preset with the connection
specific data and then saved in the block directory of the CPU.
Communication blocks PCom (CPU300)
5.7.6.1
S7-300 CPU without partyline
FB PCom is used only with communication via the P bus. This affects the communication
between a TIM and a CPU with P bus.
Auxiliary block for FC BasicTask_P for processing a communication mailbox of the type DB
PComData using the SFCs WR_REC and RD_REC.
Received frames are also distributed immediately to the receive objects responsible in the
CPU. To do this FB PCom calls FC Distribute as an auxiliary block.
Instance data block for the communication block FB PCom. The instance DB makes the
communication mailbox available and contains the following:
● The receive mailbox (ReceiveBuffer)
● A send mailbox (SendBuffer)
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