Siemens SIMATIC S5-105R CPU905 central processing unit, model 6ES5 905-3RB11, new old stock in original box with board protected in antistatic packaging.
Module appears unused; box shows storage wear but the PCB and front panel are clean with no installation marks visible.
Brand: Siemens
Series: SIMATIC S5-105R
Model: CPU 905
MPN: 6ES5 905-3RB11 (also written 6ES5905-3RB11)
Type: PLC central processing unit / CPU module
Program capacity: 500 program elements (contacts) internal; supports external EPROM memory submodule for program storage.
Integrated resources: 16 counters and 32 timers.
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Interfaces:
Front PG/PU 15‑pin programming device interface connector
Front “Betrieb/Run – Stop” LEDs and Run/Stop selector switch
Intended system: SIMATIC S5‑105R compact PLC systems.
Dimensions: Approx. 266 × 46 × 185 mm; weight about 0.5 kg.
Country of manufacture: Germany (box and PCB markings).
New old stock (never installed/used) based on clean edge connector, front panel and included original Siemens box.
Board is stored in antistatic bag with protective metal shield plate; only minor handling marks on shield possible from storage.
Original cardboard box shows age, discoloration, labels and tape residue but remains usable for shipping.
No additional accessories, memory modules, or documentation included beyond what is shown in photos.
Legacy CPU for existing S5‑105R installations; useful as a spare module or for system expansion.
Siemens has long discontinued S5‑105R; users should verify compatibility with existing racks, I/O modules and programming tools before purchase.
Recommended to handle only in ESD‑safe environment and to update firmware/EEPROM as required for your application.
