Interfaces, Networks and Data Communication for the S7-400
5-15
Automation System S7-400 Configuration and Use
A5E0044271 1-02
FBs for open TCP/IP communication via Industrial Ethernet
With these FBs you can exchange data with other TCP/IP-capable communication
partners via the program.
SFB Description
FB 65 TCON Establishes the connection
FB 66 TDISCON Closes the connection
FB 63 TSEND Sends data (1432 bytes)
FB 64 TRCV Receives data (1432 bytes)
TCP/IP communication is based on the connection. Data is only transferred once a
connection to the communication partner has been established. The CPU can use
several connections to the communication partner simultaneously.
The following protocol variants are supported:
• TCP/IP native
• ISO on TCP according to RFC 1006
FCs for S5-Compatible Communication
These FCs are used for communication within SIMATIC S7 and for communication
between SIMATIC S7 and SIMATIC S5 as well as non-S7 stations (e.g. PCs).
Communication between stations in different STEP 7 projects is possible.
The blocks are part of the NCM add-on package.
SFC Description
FC 5 AG_SEND Sends data blocks via a configured link to a communication partner
(max. 240 bytes)
FC 6 AG_RECV Receives data blocks via a configured link from a communication
partner (max. 240 bytes)
FC 50 AG_LSEND Sends data blocks via a configured link to a communication partner
(max. 8 KB)
FC 60 AG_LRECV Receives data blocks via a configured link from a communication
partner (max. 8 KB)
FC 7 AG_LOCK Disables external data access
FC 8 AG_UNLOCK Enables external data access
FBs for Standard Communication (FMS)
These FBs are used for the exchange of data with non-Siemens systems on
PROFIBUS DP using open communication on Layer 7 of the ISO reference model
according to the PROFIBUS standard. Data volumes of up to 237 bytes can be
transferred.
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