Using FM 451 This section contains information on the following topics:Terminal assignment of FM 451 front connector (S7-300, S7-400)Functions of the FM 451 (S7-300, S7-400)Parameter assignment FM 451 (S7-300, S7-400)Using FM 451 from the user program (S7-300, S7-400)FM 451: Online & Diagnostics (S7-300, S7-400)