Siemens SIMATIC NET S7-400 Equipment Manual page 17

Refer to the documentation of the program blocks in the online help of STEP 7 or in the
manual "/7/ (Page 51)".
Note
We recommend that you always use the latest block versions for all module types.
You will find information on the current block versions and the current blocks to download
from the Internet in our Customer Support at the following address:
Link: (https://support.industry.siemens.com/cs/ww/en/ps/15677/pm)
With older module types, this recommendation assumes that you are using the latest
firmware version for the particular module type.
Program blocks for open communications services
Program block
AG_SEND (FC5)
AG_RECV (FC6)
AG_LSEND (FC50)
AG_LRECV (FC60)
Program blocks for S7 communication
Program block
USEND (SFB 8) / URCV (SFB 9)
BSEND (SFB 12) / BRCV (SFB 13)
PUT (SFB 14) / GET (SFB 15)
START (SFB 19) / STOP (SFB 20)
RESUME (SFB 21)
STATUS (SFB 22)
USTATUS (SFB 23)
CONTROL (SFC 62)
For more information on the program blocks for S7 communication, see also STEP 7 online
help or the manual /8/ (Page 51))
CP 443-5 Extended
Equipment Manual, 01/2023, C79000-G8976-C162-10
Application and functions
1.3 Requirements for use
Meaning
Send data
Receive data
Send data
Receive data
Meaning
Uncoordinated sending / receipt of data
Block-oriented sending / receipt of data
Write data to a remote CPU / read data from a
remote CPU
Run a warm restart / stop on a remote device.
Run a hot restart on a remote device.
Query the device status of a remote partner.
Receive the status change of a remote device.
Query the status of the connection belonging to
an SFB instance.
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