une description:SIMATIC S7/PCS7 Digital input SM 321, 16 DI; 24 V DC, 1 x 40-pole, diagnostics-capable, for contacts (wired/ not wired), NAMUR encoder, 3/4-wire Bero, with chatter monitoring; Pulse extension, open-circuit detection Interface module IM 153-2 HF or IM 153-
une description:SIMATIC DP, FAILSAFE ELECT. SUBMODULE FOR ET200ISP, 4F-AI HART EX I, UP TO CATEGORY 4 (EN954-1)/ SIL3 (IEC61508)/PLE (ISO13849), FOR CONNECTION OF (HART) 2-WIRE TRANSDUCER
