Siemens 6ES5944-7UA22 Programmable Logic Controller Module

Siemens 6ES5944-7UA22 is the CPU 944 central processing unit module for the SIMATIC S5 family, designed for use in S5-115U systems to drive legacy automation tasks. The module provides 96 KB of memory for program and data storage and includes two serial interfaces (2 x TTY) for RS-232‑style communication with programming devices or field peripherals. It is a member of the CPU 944 line and is intended to operate with compatible S5 I/O and expansion modules within Siemens' older PLC ecosystem. This particular part is no longer manufactured by Siemens and is considered a legacy component; existing units are typically sourced through surplus or repair channels. Typical applications include maintenance and retrofit work on established S5-115U installations where the CPU 944 is required to preserve compatibility with existing CPs and peripherals. When sourcing this module, verify compatibility with the target S5 chassis and ensure any necessary cabling or adapters from the same generation of hardware are available.