6AV6641-0CA01-0AX0 - Siemens

OP77B 4.5" Operator Panel with MPI/Profibus-DP Interface (12MB), Printer/USB Port and MMC Card Slot ..

6AV6641-0CA01-0AX1 - Siemens

OP77B 4.5" Operator Panel with MPI/Profibus-DP interface (12MB), Printer/USB port and MMC card slot ..

6AV6641-0BA11-0AX0 - Siemens

Simatic OP77A Operator Panel with MPI/Profibus Interface up to 1.5MB..