Siemens 6ES5498-1AA51 Measuring Range Module

Siemens 6ES5498-1AA51 is a SIMATIC S5 measuring range module for analog inputs, configured for a +4 to +20 mA signal from a 2-wire transducer. As the range submodule within the analog input block, it provides the 4–20 mA measurement path for a two-wire transducer, with M+ and M− terminals for the transducer and L+ and L− for the module supply, plus an internal multiplexer (MUX) and A/D converter to digitize the current signal for the PLC. Designed for legacy SIMATIC S5 systems, this module is typically paired with an AI input module to process current-loop sensors in process control and industrial automation. Common applications include monitoring and controlling 4–20 mA sensors in factory automation environments, where precise current-range conversion is required for reliable digital representation.