User Manual

TRAIN CHIEF® II LRCS W/ Lightweight OCU-BT – OPERATORS MANUAL
95-00-0-062, Rev 08 3-10 Control Chief Corporation
WATCHDOG SYSTEM
Remote control systems based on the SLC 500 controller with the Communicator®
module will utilize a multiple feature watchdog safety system. The first watchdog circuit
is built into the wireless Communicator® module and monitors the operation of the
module CPU. Should this watchdog time out, then an automatic interrupt is generated
which faults the SLC 500 CPU and clears all SLC output tables. An additional
watchdog feature within the module will clear the module I/O image table if
communication with the remote unit is lost.
The High Current Relay/Watchdog module incorporates two (2) additional watchdog
safety systems. Each watchdog safety system consists of a circuit that drives a
dedicated output relay. Each circuit monitors a critical system function to verify proper
system operation. The dedicated watchdog relay outputs are used to control the E-
Stop relay in the locomotive interface panel.
COMMUNICATOR® MODULE
The Communicator® module included in the Train Chief® II system provides remote
control capability in a SLC 500 for Control Chief’s Lightweight OCU. The
Communicator® module provides full integration into the Allen Bradley SLC 500
chassis by presenting the command data received from the OCU into the PLC
scanned input image data table.