Patent ID: 8688247

Claim:
A lock-out, tag-out system for a power control cabinet, the lock-out, tag-out system comprising: (1) at least one lock-out, tag-out station providing: (a) contacts having a shared operator for receiving 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 station safety network interface element communicating with the contacts and display to transmit a contact state and receive a display state using redundant communication on a serial network; (2) a safety programmable logic controller communicating with the serial network the safety programmable logic controller executing a stored program to receive the contact state and the display state and to redirect them on the serial network according to a stored program; (3) at least one power control circuit positionable in the power control cabinet, the power control circuit providing: (a) a first and second contactor each providing a coil switching independent contacts, the contacts of the first contactor in series with contacts of the second contactor to communicate, when closed, electrical power between a power source and motor circuitry; (b) a voltage sensor detecting voltage at a connection between the motor circuitry and the first and second contactor to detect removal of power from the motor circuitry; (c) a cabinet safety network interface element communicating on the serial network to receive the contact state to control the coils of the first and second contactors and transmit display state derived from the voltage sensor detecting removal of power from the motor circuitry.