Patent ID: 8643225

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) at least two 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 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 SIL-3 reliable communication; (2) power control circuit positionable in the power control cabinet, the power control circuit providing: (a) a first and second contactor each providing coil switching independent contacts, the contacts of the first contactor in series with the contacts of the second contactor to communicate, when closed, electrical power between a power source and the 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 second 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; wherein the first and second safety network interface communicate peer-to-peer without an intervening safety controller.