SIMATIC DP, Electronics module for ET 200SP, F-DI 8x 24 V DC HF, 15 mm width, up to PL E (ISO 13849-1)/ SIL3 (IEC 61508). This particular module is categorized as F-DI 8x 24 V DC HF, indicating that it is a digital input module with eight channels and high-speed functionality.