An image forming apparatus includes a first image bearing member, a second image bearing member, and a fixing device. The hosts, storages, and printers each have one of two data protecting functions, and each have three security levels. The leader node causes the leader and follower nodes to transition from an awake mode to a sleep mode where they consume less power. From an accumulation table, based on this class code CL, difference data DF that corresponds to the target position is read. 95 T or more; and a process where the laminated magnet is multi-polar magnetized in-plane of the thick films. The input circuit includes a first receiving circuit having first hysteresis and a second receiving circuit having second hysteresis wherein the input circuit connects either the first or the second receiving circuit to the input terminal on the basis of the setting data item in order to receive the signals and to provide the functional circuit with the signals.