Methods and apparatus to adjust operation of a fluid flow control assembly are disclosed. An example safety valve controller apparatus includes comparator circuitry to compare a current measurement to at least one of a first threshold associated with a first flow setting of a fluid flow control assembly or a second threshold associated with a second flow setting of the fluid flow control assembly, and determine a first drive signal associated with the first flow setting or a second drive signal associated with the second flow setting in response to satisfying a respective one of the first or second thresholds, and current modulating circuitry to determine a third drive signal based on the current measurement, the third drive signal to modulate the flow setting of the fluid flow control assembly between the first and second flow settings.

Methods and apparatus to adjust operation of a fluid flow control assembly are disclosed. An example safety valve controller apparatus includes comparator circuitry to compare a current measurement to at least one of a first threshold associated with a first flow setting of a fluid flow control assembly or a second threshold associated with a second flow setting of the fluid flow control assembly, and determine a first drive signal associated with the first flow setting or a second drive signal associated with the second flow setting in response to satisfying a respective one of the first or second thresholds, and current modulating circuitry to determine a third drive signal based on the current measurement, the third drive signal to modulate the flow setting of the fluid flow control assembly between the first and second flow settings.

The present disclosure provides an industrial robot safety control system, a back-up safety circuit and a safety module. The safety module includes a first safety circuit and a second safety circuit. The first safety circuit and the second safety circuit receive a warning signal at a same time. The first safety circuit is configured to respond to the warning signal. The second safety circuit include a delay system and an event response circuit. The delay system sets a time delay when receiving the warning signal, wherein, when the delay system does not receive a first control signal indicating that the first safety circuit has responded to the warning signal during the time delay, the delay system controls the event response circuit to respond to the warning signal. The present disclosure may help avoid the problem of common mode failure of the back-up safety mechanism.

A diagnostic system and method for a field device implemented in a safety instrumented system includes detecting an occurrence of a safety event associated with the field device, overriding 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, verifying the override of normal control of the field device, and transmitting a control signal to cause the field device to enter the safe state.

The present disclosure provides an industrial robot safety control system, a back-up safety circuit and a safety module. The safety module includes a first safety circuit and a second safety circuit. The first safety circuit and the second safety circuit receive a warning signal at a same time. The first safety circuit is configured to respond to the warning signal. The second safety circuit include a delay system and an event response circuit. The delay system sets a time delay when receiving the warning signal, wherein, when the delay system does not receive a first control signal indicating that the first safety circuit has responded to the warning signal during the time delay, the delay system controls the event response circuit to respond to the warning signal. The present disclosure may help avoid the problem of common mode failure of the back-up safety mechanism.