Siemens AS-i SlimLine Diagnostic Guidelines

8.3 Problem: Large fluctuations in analog input readings

Reason: Shielded twisted pair cables were not used, common mode voltage exceeded ± 2V, or jumper wires were not added between AIx - and Mx. Solution: Check the wiring and add jumper wires for voltage input; Set the filtering to 50/60Hz and turn on smoothing (P2=0) in a strong interference environment.

8.4 Problem: Only some of the modules on the device connector are working

Reason: Poor contact of AS-i or Uaux inside the connector. Solution: Pull the module out of the connector, check if the metal spring of the connector is deformed, and re insert it. Pay attention to the maximum loop current - the total current of all modules' sensors cannot exceed the Uaux power supply capacity of the first inlet.

Maintenance and spare parts recommendations

Terminal coding: Using the 3ZY1440-1AA00 coding pin can prevent the accidental insertion of terminals with different functions. When replacing a module, insert the coding pin into the corresponding hole of the terminal block of the new module in its original position.

Memory card/label: 3RT2900-1SBxx device identification label can be used to mark the address and signal name of each module.

Technical data query: Enter the complete order number (such as 3RK2402-2CE00-2AA2) in Siemens Industrial Online Support (support. industry. siemens. com) to obtain the latest data sheets, certifications, and dimension drawings.

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