Siemens 6ES5498-1AA51 Analog Input Sub Module

Siemens 6ES5498-1AA51 Analog Input Sub Module is a 4‑channel measuring range module designed for SIMATIC S5 analog inputs. It accepts +4 to +20 mA signals from 2‑wire transducers and provides four independent input channels via M+ and M− terminals, with power supplied through L+ and L−. Inside, each channel feeds a multiplexer into an analog‑to‑digital converter, enabling direct conversion of current‑loop signals to digital values read by the host controller. The module is described as a measuring range module for analog inputs within the SIMATIC S5 498 family, specifically configured for +4 to +20 mA inputs from 2‑wire transducers. Typical applications include monitoring four separate 4–20 mA sensors—such as process transmitters for flow, level, temperature, or pressure—in industrial automation where a compact, four‑channel current input interface is required. By providing conditioned current signals for four sensors, the 6ES5498‑1AA51 integrates with the S5 backplane and supply rails, using clearly labeled M+/M− input terminals alongside L+/L− power connections for reliable, day‑to‑day analog data acquisition.