AS04RTD-A is a 4-channel RTD input module for Delta AS series PLCs, fully compatible with PT100 and PT1000 sensors for high-precision medium-low temperature measurement. It supports 2-wire, 3-wire and 4-wire connections and integrates automatic lead resistance compensation to eliminate errors caused by long-distance wiring. The module offers a wide measurement range from -200°C to 600°C with high resolution and excellent linearity. It includes cold-junction compensation, wire-break alarm, digital filtering, linearization correction and data storage functions. With 2500V AC electrical isolation, it effectively suppresses interference from power equipment and transmission lines, protecting the PLC system. It is widely used in ovens, heating equipment, food processing machinery, medical devices, environmental test chambers, plastic injection molding machines and packaging equipment, providing reliable temperature data to ensure process consistency, product quality and production safety.