What it is and where it drops in
The 6AG1321-1BH02-2AA0 is a 16-channel digital input module at 24 VDC in a 40 mm slice. It is a basic DI – no diagnostic alarms, no parameterization, no hardware interrupt – so the slot is reserved for standard binary field signals. The 6AG1 prefix marks the SIPLUS extended-environment variant, rated for operation from -40 °C to 70 °C so it survives unheated cabinets, rail-side enclosures and outdoor cabinets where the standard temperature grade would be pulled to its derating limit.
Footprint for the panel layout
Isolation is tested with 500 VDC between the field side and the backplane, consistent with a basic DI of this class.