Selecting The Cpu - Siemens SIMATIC S7-300 Manual For Migrating

4 Hardware Migration
4.2

Selecting the CPU

Like SIMATIC S7-300/S7-400, SIMATIC S7-1500 provides a selection of CPUs
with different performance levels.
For reference, the appendix provides an overview table that compares the S7-
300/S7-400
7.1.1 CPU
As - aside from criteria such as processing speed, internal memory, number of
interfaces and communication connections, etc. - there are other plant-dependent
selection criteria, the tables only provide a rough guide for selecting the CPU.
Examples of other plant-dependent selection criteria:
Are there still reserves in the S7-300/S7-400 CPU or is it already operated in
the limit range of the automation task (terminal-terminal response time, cycle
time, memory requirements, ...)?
Should plant parts that belong together logically or logistically and that have
previously been separated on the controller side be combined to one shared
control area? Keyword: Plant redesign
Migration S7-300/S7-400 nach S7-1500
Entry ID: 109478811, V1.1,
CPUs to the
modules)
05/2017
recommended S7-1500 CPUs. (Chapter
18