Siemens A1-16-100-504-ISS9 Interface Module PC Board

Siemens A1-16-100-504-ISS9 Interface Module PC Board is a Siemens-manufactured peripheral designed as an interface module on a printed circuit board. The model designation A1-16-100-504-ISS9 identifies the exact part used in Siemens automation configurations, and the listing describes it explicitly as a PC BOARD INTERFACE MODULE. Notably, this interface module provides a 70-pin input interface, enabling multiple input signals to be routed through a single module. As a dedicated Siemens interface board, it serves as a periphery component within broader control-system architectures, connecting field inputs to the main controller via its specialized connector and layout. For technicians replacing or upgrading legacy Siemens hardware, the A1-16-100-504-ISS9 is recognizable by its full model name and the 70-pin input interface, ensuring alignment with compatible backplanes and cabinets that support this family of interface modules.