Patent ID: 8024053

Claim:
A safety instrumentation system connected to a plant control system, said safety instrumentation system comprising: a receiving unit that receives an instruction of an operation to a device of the safety instrumentation system through an instruction receiving part for receiving an instruction of an operation to a field device of the plant control system; an instruction converting unit that converts the data form of the instruction of the operation received by the receiving unit to the data form of the safety instrumentation system from the data form of the plant control system so that the instruction received by the receiving unit can be used as the instruction of the operation to the device of the safety instrumentation system; an operation carrying out unit that receives the instruction of the operation obtained from the instruction converting unit and then carries out the operation based on the reception, and preferentially carries out an operation of shut down of a plant when shut down phenomenon arises; a display unit that displays, on a face plate which operates and monitors the field device in the plant control system, the state of the field device of the plant control system; and a state converting unit that converts the data form of data showing the state of the device of the safety instrumentation system to the data form of the plant control system from the data form of the safety instrumentation system so that the state of the device of the safety instrumentation system can be displayed on the face plate by the display unit, wherein the instruction converting unit and the operation carrying out unit are formed by using a function block mounted on the safety instrumentation system.