Siemens C8451-A5-A10-2 is a circuit board card PLC module from Siemens. The listing identifies the part as C8451-A5-A10-2 and associates it with SKU SKC85-E72-A3 (SKC85E72A3 in some catalogs). This module is part of Siemens' C8451 family of circuit board cards used in compatible PLC configurations.
