1-2 Appearance and Names of Parts Names of Parts Inside the Front Cover 1 Main circuit terminal block (input side) 8k8k8k8 Overview Do not touch these! (ELECTRICAL HAZARD: For factory maintenance only) Communications connector Relay output terminal block S7 S8 485 ON Control circuit terminal block OPE OFF Main circuit terminal block (output side) S7: OPE/485 communications selector (Default = OPE side) S8: Emergency shutoff function selector (Default = OFF) (Caution) Do not switch the emergency shutoff function selector (S8) without reason as the allocation of the multi-function input terminals may change. For details, refer to "Emergency Shutoff Input Function" (page 4-45). 1-4