Siemens SIMATIC S7-400 Configuration And Use Manual page 79

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
FB 65 TCON
FB 66 TDISCON
FB 63 TSEND
FB 64 TRCV
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
FC 5 AG_SEND
FC 6 AG_RECV
FC 50 AG_LSEND
FC 60 AG_LRECV
FC 7 AG_LOCK
FC 8 AG_UNLOCK
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.
Automation System S7-400 Configuration and Use
A5E00442711-02
Interfaces, Networks and Data Communication for the S7-400
Establishes the connection
Closes the connection
Sends data (1432 bytes)
Receives data (1432 bytes)
Sends data blocks via a configured link to a communication partner
(max. 240 bytes)
Receives data blocks via a configured link from a communication
partner (max. 240 bytes)
Sends data blocks via a configured link to a communication partner
(max. 8 KB)
Receives data blocks via a configured link from a communication
partner (max. 8 KB)
Disables external data access
Enables external data access
Description
Description
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