Field control system and field control method
AssigneeYokogawa Electric Corporation
InventorsHiroshi Miyata, Yukiyo Akisada, Masahito Endo, Hiroki Endo, Kensuke Hosoya
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Abstract
In a field control system in which a plurality of field equipments that are operated in a previously set schedule and constitute a control loop perform a packet communication via a network, there is provided a configurator for collecting measured result packets to which a time stamp of each field equipment is affixed respectively, grasping at least any one of communication times between respective field equipments based on the time stamp, and adjusting operation schedules of respective field equipments in response to the communication times.
Claims13
A field control system comprising:
- a plurality of field equipments that are operated in a previously set schedule and constitute a control loop, the field equipments performing a packet communication via a network;
- and
- a configurator which collects a measured result packet to which a first time stamp corresponding to a transmission time and a second time stamp corresponding to a reception time are affixed, calculates an amount of time required for a measurement packet communication between a first field equipment and a second field equipment among the plurality of field equipments based on the first affixed time stamp and the second affixed time stamp, and adjusts operation schedules of respective field equipments in response to the calculated amount of time,
- wherein the second field equipment, when it detects a delay of a control process, transmits a delay notice packet to the configurator.
A field control system comprising:
- a plurality of field equipments that are operated in a previously set schedule and constitute a control loop, the field equipments performing a packet communication via a network;
- and
- a configurator which collects a measured result packet to which a first time stamp corresponding to a transmission time and a second time stamp corresponding to a reception time are affixed, calculates an amount of time required for a measurement packet communication between a first field equipment and a second field equipment among the plurality of field equipments based on the first affixed time stamp and the second affixed time stamp, and adjusts operation schedules of respective field equipments in response to the calculated amount of time,
- wherein the first field equipment initiates the measurement packet communication by transmitting a time measurement packet to the second field equipment, and the second field equipment transmits the measured result packet to the configurator, and
- wherein the second field equipment, when it detects a delay of a control process, transmits a delay notice packet to the configurator.
The field control method performed in a field control device in which a plurality of field equipments that are operated in a previously set schedule and constitute a control loop perform a packet communication via a network, said method comprising:
- collecting a measured result packet to which a first time stamp corresponding to a transmission time and a second time stamp corresponding to a reception time are affixed;
- calculating an amount of time required for a measurement packet communication between a first field equipment and a second field equipment among the plurality of field equipments based on the first affixed time stamp and the second affixed time stamp;
- and
- adjusting operation schedules of respective field equipments in response to the calculated amount of time,
- wherein the second field equipment, when it detects a delay of a control process, transmits a delay notice packet to a configurator.
Dependencies are inferred from the claim text.