The CPU 945 is intended for an S5-115U rack and provides the program-processing core for the installed automation station. Its 384 KB memory and provision for an additional interface module distinguish the article in the S5 range. Replacement work should retain the original memory media, project backup and rack configuration.

SIMATIC S5-115U
STEP 5 engineering environment
Installed S5 I/O and rack configuration
Additional interface-module slot

◆ S5-115U rack processor
◆ 384 KB program capacity
◆ Additional-interface provision
◆ Legacy spare continuity

Executes the established STEP 5 program and coordinates the installed S5-115U rack and connected process I/O.

Used in manufacturing lines, process plants, material handling, packaging, water treatment and other installations where S7-300 controllers coordinate PROFIBUS I/O, drives and operator equipment.

Install in the S7-300 rack, connect the 24 V supply and 9-pin PROFIBUS interface, then load the verified STEP 7 configuration. For replacement, retain the exact article number and firmware context; CPU-stored configuration can support replacement without a programming device.

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