The KNC-PLC-K631 Analog Input Expansion Modules are offered for current and voltage inputs or Resistance Temperature Detector (RTD) sensor inputs. The KNC-PLC-K631-04RD is an RTD module that accepts the following sensor types: Pt100, Pt1000, Cu50, and Cu100. The KNC-PLC-K631-04IV performs a 12-bit conversion on the inputs for high-resolution measurement and can be configured to read voltages or currents of different ranges. The KNC-PLC-K631-04IV can accept a current range 0-20 mA or 4-20 mA, and a voltage range of 1-5 VDC or 0-10 VDC. The KNC-PLC-K631 series has an accuracy of +/- 0.3% ensuring a precise reading. These modules are attached to the KNC-PLC-K6 CPU series to provide analog input capabilities. Up to 6 of the analog input modules can be attached to the KNC-PLC-K6 CPUs, allowing for a maximum of 24 analog inputs or 28 analog inputs if using the KNC-PLC-K606EA-30AT.