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Supplementary information
15.6 Communication services
CPU 410-5H Process Automation
System Manual, 09/2014, A5E31622160-AB
245
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You can configure fault-tolerant S7 connections using the integrated PROFINET IO
interface.
Note
Downloading the connection configuration during operation
When you load a modified connection configuration during operation, connections which
have been set up which are not affected by changes in the connection configuration may
also be aborted.
S7 communication allows you to transfer a block of up to 64 Kbytes per call to the SFB. An
S7-400 transfers a maximum of 4 tags per block call.
SFBs for S7 Communication
The following SFBs are integrated in the operating system of the S7-400 CPUs:
Table 15- 6 SFBs for S7 Communication
Block
Block name
Brief description
SFB 8
SFB 9
USEND
URCV
Send data to a remote partner SFB of type "URCV"
Receive asynchronous data from a remote partner SFB of type "USEND"
SFB 12
SFB 13
BSEND
BRCV
Send data to a remote partner SFB of type "BRCV"
Receive data from a remote partner SFB of type "BSEND"
With this data transfer, a larger amount of data can be transported between the
communication partners than is possible with all other communications SFBs for the
configured S7 connections.
SFB 14
GET
Read data from a remote CPU
SFB 15
PUT
Write data to a remote CPU
SFB 16
Send data via a CP 441 to a printer
SFB 19
START
Carry out a reboot (warm restart) or cold restart in a remote station
SFB 20
STOP
Set a remote station to STOP operating state
SFB 22
STATUS
Query the device status of a remote partner
SFB 23
USTATUS
Uncoordinated receiving of a remote device status
Integration into STEP 7
S7 communication offers communication functions through configured S7 connections. You
use STEP 7 to configure the connections.
S7 connections with an S7-400 are established when the connection data is downloaded.