Rockwell Automation Publication 750-RM100A-EN-P - August 2019 65
Emergency Override Function Chapter 8
Activate the Emergency
Override Feature
The Emergency Override function can be activated by setting a bit in the
controller, or by a discrete-wired digital input.
Logic Command
Program the Logix project to set bit 15 ‘Emerg OVRD’ to create an Emergency
Override command.
Program it to clear the bit to remove the Emergency Override command.
Discrete-Wired Digital Input
Use parameter 0:134 [DI EmergencyOVRD] to select a digital input on an I/O
option card in one of the option slots. To create an Emergency Override
command, wire the input to circuitry that closes or energizes. To remove the
Emergency Override command the circuitry opens or de-energizes.
Go to the Command group in the Feedback and I/O file on port 0.
Go to parameter 0:134 [DI EmergencyOVRD] and map the function to the
input on the option card you have wired to the circuit.
Interaction between Logic Command and Digital Input
You cannot use both logic command and digital input in the same configuration.
The digital input takes priority over the logic command. If you choose to
configure the digital input function, selecting a nonzero value in parameter 0:134
[DI EmergencyOVRD], disables bit 15 ‘Emerg OVRD’ in the Logic Command.
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