Sigmatek TO32F 01-003-321 I Module

Sigmatek TO32F 01-003-321 I Module is a 32-channel digital I/O module from Sigmatek, designed to extend a controller’s input and output capacity in industrial automation. The part is identified as 01-003-321 and is commonly described in catalogs as an I/O module with 32 inputs/outputs, categorized as a VDC logic I/O device. Housed in the TO32F form factor, the module features LED signaling to indicate status and weighs about 0.70 lb (0.32 kg). In practice it’s used to interface digital signals from sensors and to drive actuators such as relays or indicators within a control cabinet or automated system. The PI321 designation is sometimes used interchangeably in listings for this same 01-003-321 module. Several third-party listings note that the product has been discontinued by the manufacturer, which can affect availability and support, so buyers often rely on remaining stock or refurbished units when sourcing this part.