8xPCs Siemens – 6ES7 121‑1BB00‑0AA0 – Simatic ET 200SC Electronic Submodule

The Siemens 6ES7 121‑1BB00‑0AA0 (also 6ES7121‑1BB00‑0AA0) is a compact electronic submodule for the ET 200SC/ET 200L distributed I/O system. It provides two isolated digital input channels (sink‑type) designed for signal monitoring in automation and control applications using 24 V DC sensors.

Key Features:

• Model: 6ES7 121‑1BB00‑0AA0 (6ES7121‑1BB00‑0AA0)  

• Function: 2-channel digital input module, sink type, for ET 200SC and ET 200L

• Supply/Input Voltage: 24 V DC (20.4–30 V); rated current ~7 mA per channel  

• Input Signal Thresholds:

  • OFF below –3 … +5 V

  • ON between 13 … 30 V  

• Response Time: 1.2…4.8 ms for both ON→OFF and OFF→ON transitions  

• Max Cable Length: 1,000 m (shielded), 600 m (unshielded)  

• Power Loss: ~0.4 W typical  

• Rack Requirements: Requires TB16SC terminal block; occupies 1 slot  

• Dimensions/Weight: Approx. 86 × 59 × 74 mm; ~150 g

• Form: Spare/field-service packaging (8 pcs per pack)