Siemens CPU 410-5H Process Automation User Manual

Supplementary information
16.6 Communication services
CPU 410-5H Process Automation/CPU 410 SMART
System Manual, 10/2013, A5E32631667-AA
225
The S7-400 features integrated S7 communication services that allow the user program in
the controller to initiate reading and writing of data. The S7 communication functions are
called in the user program using SFBs. These functions are independent of specific
networks, allowing you to program S7 communication via PROFINET, Industrial Ethernet, or
PROFIBUS.
S7 communication services provide the following options:
● During system configuration, you configure the connections used by the
S7 communication. These connections remain configured until you download a new
configuration.
● You can establish several connections to the same partner. The number of
communication partners accessible at any time is restricted to the number of connection
resources available.
● 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 connect
ion 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 16- 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
PRINT
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

Siemens CPU 410-5H Process Automation Specifications

General

Brand	Siemens
Model	CPU 410-5H Process Automation
Category	Controller
Language	English