Custom Linking To Single-Channel Systems - Siemens SIMATIC S7-400H System Manual

Communication
11.6 Communication via S7 connections
11.6.4

Custom linking to single-channel systems

Connection via PC as gateway
Fault-tolerant systems and single-channel systems can also be linked by a gateway (no
connection redundancy). The gateway is linked to the system bus by one or two CPs,
depending on availability requirements. Fault-tolerant connections can be configured
between the gateway and the fault-tolerant systems. The gateway allows you to link any
kinds of single-channel system (e.g. TCP/IP with a manufacturer-specific protocol).
A user-programmed software instance in the gateway implements the single-channel
transition to the fault-tolerant systems, and so allows any single-channel system to be linked
to a fault-tolerant system.
Configuring connections
Redundant connections between the gateway CP and the single-channel system are not
required.
The gateway CP is located on a PC system which has fault-tolerant connections to the
fault-tolerant system.
To configure fault-tolerant S7 connections between the fault-tolerant system A and the
gateway, you first need to install S7-REDCONNECT on the gateway. The functions for
preparing data for their transfer via the single-channel link must be implemented in the user
program.
For further information, refer to the "
Figure 11-13 Example of linking of a fault-tolerant system to a single-channel external system
174
Industrial Communications IK10
System Manual, 09/2007, A5E00267695-03
" catalog.
S7-400H