FIELD: control; regulation.
SUBSTANCE: method of controlling a field device comprises detecting, by a hardware module, an occurrence of a safety event associated with a field device, overriding, by the 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, wherein overriding normal control of the field device includes the hardware module providing a hardware control signal; detecting, by a software module, the occurrence of the safety event associated with the field device; monitoring, by the software module, the overriding of normal control of the field device by monitoring the hardware control signal generated by the hardware module; verifying, by the software module, the overriding of normal control of the field device by comparing the safe state signal with the monitored hardware control signal; and transmitting, by the software module, a software control signal to cause the field device to enter the safe state.
EFFECT: providing a high level of security.
17 cl, 3 dwg
