Siemens SIMATIC S5-105R CPU905 Central Module 6ES5 905-3RB11, New

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.

Item details

• 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.

• 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).

Condition

• 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.

Notes

• 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.