18 Rockwell Automation Publication 1756-UM004C-EN-P - June 2021
Chapter 1 ControlLogix EtherNet/IP Network Device Overview
Protected Mode in a
Redundant Adapter Pair
The 1756-EN4TR supports explicit protected mode in a redundant adapter pair.
In this mode, the module does not allow any configuration changes.
Enabling Explicit Protected Mode in a Redundant Adapter Pair (RAP)
To enable the module in an “explicit protected mode state in RAP”, follow these
steps.
1. Put your system in a qualified state.
2. Remove the secondary device from the chassis, put it in explicit mode
using the methods found on page 17
, and insert module back into the
chassis.
The system is qualified with the message “Explicit Protected Mode
Mismatch” on the module display.
3. Force a switchover either using AOP service or disconnect the cable.
4. Remove secondary (previous primary) device, put it in explicit mode and
insert module back.
The system has enabled explicit protected mode.
Disabling Explicit Protected Mode in a Redundant Adapter Pair
To disable the module in an “explicit protected mode state in RAP”, follow
these steps.
1. Put your system in a qualified state.
2. Remove the secondary device from the chassis, put it in non-protected
mode using the methods found on page 17
, and insert module back into
the chassis.
The system is qualified with the message “Explicit Protected Mode
Mismatch” on the module display.
3. Force a switchover either using AOP service or disconnect the cable.
4. Remove secondary (previous primary) device, put it in non-protected
mode and insert module back.
The system has disabled explicit protected mode.
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