| 主权项 |
1. A method of controlling a field device implemented in a safety instrumented system, the method comprising:
detecting, at a hardware module, an occurrence of a safety event associated with a field device implemented in a safety instrumented system; overriding, at a hardware module, normal control of the field device to cause the field device to enter a safe state in response to the detected occurrence of the safety event; detecting, at a software module, the occurrence of the safety event associated with the field device of the safety instrumented system; monitoring, at a software module, the overriding of normal control of the field device; verifying, at a software module, the overriding of normal control of the field device; and transmitting, at a software module, a software control signal to cause the field device to enter the safe state. |
