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US 2014/0111303 A1Published application
Lock-Out, Tag-Out System Using Safety Programmable Logic Controller
AssigneeRockwell Automation Technologies, Inc.
InventorMichael Scharnick
Life of this patent
Estimating the term…
Abstract
A remote lock-out, tag-out system for controlling multiple buckets in a motor control center employs a safety network providing serial communication between one or more remote lock-out, tag-out stations and individual buckets of the control center permitting remote disconnection of power without the need for protective gear.
Claims15
A lock-out, tag-out station comprising:
- (a) contacts having a shared operator, the operator adapted to receive a padlock when the operator is in a deactivation position, the padlock blocking actuation of the operator,
- (b) a display indicating deactivation of at least one associated motor circuit;
- and
- (c) a first safety network interface element connected to the contacts and the display to transmit a contact state and receive a display state using redundant data on a serial network configured to provide communication to system isolation equipment.
1 more element
A remote lock-out station for communicating with system isolation equipment comprising:
- an indicator display;
- a disconnect operator coupled to a switch block providing a first set of contacts and a second set of contacts, wherein a first position of the disconnect operator closes at least one of the first set of contacts and the second set of contacts in the switch block, and a second position of the disconnect operator opens at least one of the first set of contacts and the second set of contacts in the switch block;
- and
- a safety network interface module in communication with the indicator display and the switch block;
- wherein the safety network interface module is adapted to transmit a first signal when the first set of contacts and the second set of contacts are open and receive a second signal in response to the first signal, and
- wherein the safety network interface module changes the indicator display in response to the second signal.
3 more elements
Dependencies are inferred from the claim text.