Overview
The TM5SDI2DFS is a safety DC discrete input module in the Modicon TM5 range, carrying two 24 V DC sink inputs with hardware filtering fixed at <= 150 ms. It is rated SIL 3 per IEC 61508 and IEC 62061, and PL e per EN 13849-1, making it suitable for safety-related circuits up to those levels. The module is active in Schneider's current catalogue, so it is available through standard distribution channels without last-time-buy constraints.
Selection vs TM5SDI2D
The TM5SDI2DFS differs from the standard discrete input module TM5SDI2D in two key areas: its input filtering is fixed at <= 150 ms hardware versus the TM5SDI2D's <= 100 ms, and its input impedance is 7.0 ohms versus 6.4 ohms. The TM5SDI2DFS is a safety-rated module (SIL 3, PL e), while the TM5SDI2D is a general-purpose discrete input module. Choose the TM5SDI2DFS when the application requires a safety-rated input channel; the TM5SDI2D is the correct choice for non-safety standard inputs where faster filtering and lower impedance are preferred.