93 results about "Process control block" patented technology

A process control or safety instrumented system uses function block logic to coordinate the logic within the process control or safety instrumented system with operational states of field devices, even when these operational states are initiated externally to the process control or safety system. Logic within input or voter function blocks associated with field devices may monitor and determine when the associated field devices are being put into testing or calibration modes and may automatically initiate appropriate bypass or override functionality in response to such detected field device configuration states. Likewise, the function block logic may automatically remove the bypass or override functionality when the field devices are placed back into their normal operational configuration states. This automatic initiation of bypasses and overrides helps to prevent a safety system within a process plant from initiating a shut-down procedure as a result of a device test initiated manually by, for example, a hand-held device attached to a field device. Likewise, the automatic removal of bypasses and overrides helps to prevent a safety system within a process plant from failing to operate properly because a user forgot to manually remove a bypass or override that was set up to allow a device test.

The invention provide a process control system that can issue a work instruction sheet in the initially planned sequence order in the sub-line production process, even if the sequence order of the product in the main production line is changed. The process control device includes a tracking controller (11) receiving event information indicating that a product pass a predetermined location is received, and controlling the current position and sequence status of the products; a conductor unit (12) for determining a corresponding process based on the event information; and a work instruction unit(14) for issuing a work instruction for the product in the production line in response to the request from the conductor unit. The device further includes a work instruction past record control unit(15) for controlling past record of the work instructions in response to an issue of the work instruction; a work instruction sequence order control unit (13) for controlling a sequence order of the work instructions; and a work instruction sequence order storage (18) for storing information of the sequence order of the work instructions. Thereby, the control to the information of the sequence order of the work instructions in addition to the current location information of the product is realized.

A process control or safety system within a process plant using one or more detection blocks to affect the timely and safe operation of on-line detection procedures within field devices such as valves used in the process control or safety system. These detection blocks are easy to implement and easy to place in a process control or safety system. The detection blocks enable periodic or on-demand detection of field devices to be integrated into normal and ongoing operation of the process control or safety system without causing Scheduling or connection issues, and without relying on maintenance staff or other personnel, thereby providing better monitoring of the operational status of field devices used in process control and safety systems. This function is especially important in safety systems where, when an unsafe condition occurs, it may be desirable to monitor or estimate in time the operational status of the devices used to shut down the process in order to ensure the safety of the shutdown operation by the safety system that actually causes the system to shut down. start up.