Siemens SIMATIC S5 Manual page 17

System Overview
1.1 System Environment of the IP 265
Use of the IP 265 enables the control of fast sub processes of an overall system. For
communication with the system environment, the module is equipped with several ports. The
SIMATIC S5 hardware constitutes the direct environment of the IP 265.
Memory
Printer
submodule
PG/PC
CPU
Expansion of the IP 265
Interface to the external I/O bus
In normal operation, the IP 265 (and the sub process controlled by it) communicates with the
CPU user program.
- The CPU user program transfers control commands to the IP 265 via the I/O bus and
evaluates their statuses.
- Via the I/O bus, parameters can additionally be exchanged between the CPU user program
and the IP 265 user program.
Interface to the process
The fast sub process is processed independently by the IP 265. The inputs and outputs of the
module communicating with the process are local and cannot be accessed direct via the CPU.
Submodule receptacle for accommodating a memory submodule
The memory submodule is required for storage of the IP 265 program data.
1-2
Memory
submodule
IP 265
I/O bus
Process
Figure 1-1. System Environment of the Module
Memory
submodule
IP 265
I/O bus
EWA 4NEB 812 6130-02a
IP 265