Product Overview

The 6ES5464-8MF21​ is a high-resolution analog input module within Siemens’ SIMATIC S5 programmable logic controller ecosystem, engineered specifically for the S5-115U central rack architecture (the “8M” prefix denoting S5-115U central-format mechanical and bus compatibility). It belongs to the S5 SM 464 analog input family, where the “F” variant designation (within the 8Mxx coding) distinguishes a 4-channel, 14-bit (+ sign bit) high-precision configuration intended for measurement tasks requiring finer granularity than the more common 8-channel, 13-bit “A” variant (6ES5464-8MA11). The 6ES5464-8MF21​ is built in Siemens’ S5-115U central-module mechanical envelope—40 mm width, 255 mm height, 195 mm depth—and interfaces directly with the S5-115U backplane bus, drawing 5 V DC system power for its logic section while receiving field analog signals through a 40-pin front connector.What sets the 6ES5464-8MF21​ apart within the 464 family is its reliance on Siemens’ MMC (Messbereichskarte / Measuring Range Module) system. Rather than hard-coding input ranges into the PCB, the module presents sockets for MMC daughter cards that define each channel’s electrical personality: ±10 V, ±5 V, ±2.5 V, 0–20 mA, 4–20 mA, ±20 mA, thermocouple types (J, K, L, N, etc.), and 3-/4-wire RTD (Pt100) configurations are all selectable simply by populating the correct MMC in each channel position. This makes the 6ES5464-8MF21​ exceptionally flexible across varied sensing topologies—a single spare module SKU can serve a temperature-skid application one day (MMC-TK thermocouple cards) and a pressure-transmitter application the next (MMC-I 4–20 mA cards) without hardware change beyond the MMC swap.With 14-bit core resolution (plus sign, effectively 15-bit including polarity, yielding 32,768 distinct counts per polarity span), the 6ES5464-8MF21​ delivers finer quantization than the 13-bit 464-A variant—relevant in applications such as weigh-scale load-cell intermediates, precision pressure transmitters, or analytical-sampling pH/orp where 13-bit (8192 counts) is marginally coarse. The module executes cyclic A/D conversion per channel with a per-channel conversion time in the ~50 ms class (typical S5 464 behavior; exact value dependent on MMC type), and presents the converted words to the S5-115U CPU via the central bus for ladder or S5-DB access. Like all S5 analog modules, the 6ES5464-8MF21​ is long obsolete under Siemens’ PLM (PM500/deleted status expected in the S5 sunset timeline post-2020), making verified spare stock the primary sourcing path for the remaining S5-115U installed base in water treatment, batching, extrusion, and legacy process skids.

Technical Specifications