CPU for ET 200S – validation context
6ES7151-7AA10-0AB0: SIMATIC ET 200S IM 151-7 CPU handles PROFIBUS DP link. Runs FBD, LAD, SCL (optional), STL; 48 kbyte memory holds ~16 K instructions. Forcing and single-step available under change control.
Documentation and data retention
Retentive data is preserved for 6 weeks at 40°C ambient typical, which supports the data integrity requirement during power-loss scenarios in validated systems. The STEP 7 project and HW Config file remain the primary verification references for IQ/OQ. No firmware auto-update mechanism is present; the firmware version is locked at delivery, preserving the audit trail.
Panel integration – physical constraints
The module occupies 60 mm on the ET 200S rail. Depth is 75 mm, height 119.5 mm. A narrower DP master module variant (35 mm) exists, but this is the standard interface module. The integrated RS-485 port handles PROFIBUS DP; bus termination must be verified during commissioning. I/O mapping is fixed at 244 bytes input and 244 bytes output, with no expandability – the memory is locked at 48 kbyte.