Siemens SIMATIC S5-110A CPU central module, type ZB/CPU, model 6ES5 900-7AD11, in good used working condition. This legacy PLC processor is suitable as a replacement CPU for SIMATIC S5-110A systems where an EPROM-based central unit is required.
Brand: Siemens
Series: SIMATIC S5-110A
Type: CPU / central module (Zentralbaugruppe, ZB/CPU)
MPN: 6ES5 900-7AD11 (also written 6ES5900-7AD11)
Function: Main CPU/processor module for S5-110A PLC racks
Memory: Uses plug-in EPROM memory submodule (orange EPROM carrier on front)
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Front controls/indicators:
Stop/Cycle mode switch
NR/R selector switch
Status LED on front panel
System compatibility: SIMATIC S5-110A PLC systems designed for CPU 900 / CPU 110 central modules
Country of manufacture: Made in Germany (label on side)
See photos/label for full technical specifications and exact configuration.
Used module in good overall cosmetic and working condition.
Typical signs of previous use: dust, surface marks and light scratches on housing; label edges show some discoloration.
Front panel text and switch legends remain clear and readable; EPROM carrier and switches move freely.
Supplied as module only, without backplane, manuals, cables, or original packaging.
