MONITORING DEVICE FOR PROGRAMMABLE CONTROLLER

• US 20160306333A1
• Filed: 04/14/2016
• Published: 10/20/2016
• Est. Priority Date: 04/20/2015
• Status: Active Grant

• Current Assignee: Jtekt Corporation (Toyota Motor Corporation)
• Original Assignee: Jtekt Corporation (Toyota Motor Corporation)
• Inventors: SHIMIZU, Akihiro, Senda, Terukazu
• Granted Patent: US 9,971,331 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G05B 19/0428 Safety, monitoring G05B19/0423 takes precedence
• CPC Class Codes: G05B 2219/23403 Store edited program also in detachable programmer, can be used elsewhere
• CPC Class Codes: G05B 2219/24015 Monitoring
• CPC Class Codes: G05B 2219/24198 Restart, reinitialize, boot system after fault detection, hanging up, stalling

Abstract

A monitoring device for a programmable controller can resume continuous operation from an appropriate step, when the equipment is restarted after abnormality handling process. The monitoring device includes: a read device that reads operating state information of equipment from the programmable controller during individual operation; a relationship information storage device that stores relationship information showing relationship between the first step to be executed out of the steps when the equipment is restarted after the individual operation and the operating state information; a selection device that refers to the operating state information and selects the first step to be executed when the equipment is restarted, based on the relationship information; and a command transmission device that transmits a command to change an in-execution flag of the programmable controller which shows the first step to be executed when the equipment is restarted, based on the selection result of the selection device.

Claims

1. A monitoring device for a programmable controller that executes a program written so as to include steps provided for respective operation units of equipment to be controlled and a transition condition between the steps, the monitoring device monitoring the programmable controller, the monitoring device comprising:

a read device that reads operating state information showing an operating state of the equipment from the programmable controller during individual operation of individually operating the equipment by the operation unit;

a relationship information storage device that stores relationship information showing relationship between the first step to be executed when the equipment is restarted to resume continuous operation of the steps after the individual operation and the operating state information;

a selection device that refers to the operating state information and selects from the steps the first step to be executed when the equipment is restarted, based on the relationship information; and

a command transmission device that transmits to the programmable controller a command to change restart position information stored in the programmable controller as information showing the first step to be executed when the equipment is restarted, based on the selection result of the selection device.

2. The monitoring device for the programmable controller according to claim 1, further comprising:

a condition fulfillment storage device that stores information that the operating state information read by the read device during the individual operation has satisfied a predetermined condition, and retains this information even after the predetermined condition is no longer satisfied, wherein

the relationship information storage device stores relationship information showing relationship between the first step to be executed out of the steps when the equipment is restarted and the operating state information and the information stored in the condition fulfillment storage device, and

the selection device refers to the operating state information and the information stored in the condition fulfillment storage device and selects from the steps the first step to be executed when the equipment is restarted, based on the relationship information.