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Configuration and operation
4.3 Connection partners and connection establishment
4.3
Connection partners and connection establishment
Telecontrol communication
Connection partner
With telecontrol communication, the S7 CPU or the PC in the master station of the
connection partner.
Connection establishment
In systems with a CP 1243-8 IRC which partner establishes a connection depends on the
type of communication and the relevant configuration. A connection is established depending
on the network type:
● Dedicated line
In communication via a dedicated line, a connection is always established by the master.
The CP operates in polling mode.
● Ethernet, Dial-up network, mobile wireless network, private wireless network
In communication via dial-up networks and IP-based communication, connections are
established by the CP as the client. The CP operates in spontaneous mode.
If a connection established by the CP is interrupted, the CP automatically attempts to re-
establish the connection.
Note
Connection interrupted by the mobile wireless network provider
When using mobile wireless services, remember that existing connections can be
interrupted by mobile wireless network providers for maintenance purposes.
Open User Communication and PG/OP communication
Connection partner
In Open User Communication in an S7 station, the CPU is the connection partner.
Connection establishment
Connections are established as soon as the corresponding program blocks are called on the
CPU.
This also applies to the situation when a different S7 station sends data. In this case, the
corresponding receive blocks are called by the receiving station.
46
Operating Instructions, 06/2015, C79000-G8976-C385-01
CP 1243-8 IRC
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