Allen-Bradley 1788-CN2FFR, User Manual, Page: 48 / 104

46 Rockwell Automation Publication 1788-UM057B-EN-P - September 2014
Chapter 2 Set Up in the Studio 5000 Logix Designer Application
MultiMaster Connecting
Procedures To avoid communication loss, or a field device going to the visitor address range,
follow the MultiMaster connection procedures in this section.
Connect Safe Mode
The Connect Safe mode is used in the Reconnect Two Separate Running LAS
Devices on page 47 and Swap Out Linking Devices on page 47 procedures.
To enter the Connect Safe mode, hold the Page button for at least 5 seconds.
The LCD displays the time until communication is re-established to the linking
device (10 seconds).
Figure 8 - Location of the Page Button for Connect Safe Mode
Start the Back-up LAS Master (Already Configured)
Follow these steps to start the Back-up LAS master.
1. Plug in all communication connectors (H1, EtherNet/IP or ControlNet
cables), but not the power.
2. Once all communication connectors are plugged in, connect the power to
the linking device.
The linking device starts in Back-up LAS mode and does not disturb
communication.