Db Bconnectdata; Communication Blocks Bcom (Cpu400); Fb Bcom - Siemens TIM 1531 IRC Operating Instructions Manual

Function
Auxiliary block for FC BasicTask for processing connections to the communication partners.
5.7.4.3

DB BConnectData

Validity
S7-1500
Function
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.
5.7.5

Communication blocks BCom (CPU400)

5.7.5.1

FB BCom

Validity
● S7-1500
● S7-400
The block for the S7-400 CPU cannot be used for S7-1500 CPU and vice versa. The tasks of
the two FCs are the same.
Function
Auxiliary block for FC BasicTask_B for processing a communication mailbox of the type DB
BConnectData (S7-1500) or DB BComData (S7-400).
Via the DB, a configured PBK (programmed block communication) connection is handled
using the SFBs "BSEND" and "BRCV".
FB BCom also ensures that received frames are distributed immediately to the receive
objects responsible in the CPU. To do this FB BCom calls FC Distribute as an auxiliary
block.
TIM 1531 IRC
Operating Instructions, 02/2018, C79000-G8976-C468-02
Block library TeleControl ST7
5.7 Master copies
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