Siemens 6ES7131-6TF00-0CA0 Digital Input Module. Siemens 6ES7131-6TF00-0CA0 is the exact manufacturer order number for a digital input module in the SIMATIC ET 200 Distributed I/O portfolio. Siemens describes this exact reference as: SIMATIC ET 200SP, digital input module, DI 8x NAMUR High Feature, suitable for BU type A0, Color code CC01, channel diagnostics. The verified manufacturer lifecycle record is PM300: Active Product.