Fc Search; Fc Startup; Communication Blocks Bcom (Cpu1500); Fb Bcom - Siemens TIM 1531 IRC Operating Instructions Manual

Block library TeleControl ST7
5.7 Master copies
5.7.3.6

FC Search

Auxiliary block for the following search tasks:
● Search for the initial address of a subscriber object within the subscriber records
● Search for the local object no. (Instance DB) from one of the two object reference lists for
a received message with an incomplete destination address
The auxiliary block is required by almost all blocks.
5.7.3.7

FC Startup

The block is required in every CPU. It must be linked into the startup program OB100.
The block has the task of setting the startup memory bit in the DB BasicData and to reset the
corresponding edge memory bit if this is still set.
The block has no parameters.
5.7.4

Communication blocks BCom (CPU1500)

5.7.4.1

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.
5.7.4.2

BConnect FB

Validity
S7-1500
258
Operating Instructions, 02/2018, C79000-G8976-C468-02
TIM 1531 IRC