1756-RM Allen-Bradley

T The Batch Server detects the lost connection and repeatedly attempts to re-establish 

the connection until successful. However, while the connection is lost, the Batch Server 

puts the recipes, or entire batch, in the held state.

After the connection between the Batch Server and the redundant chassis pair is 

re-established, you can clear the communication failure and restart the recipes. The 

Batch Server keeps the recipes in the held state until the failure is cleared and recipes 

are restarted.

For more information on this method, see Update the Firmware by Using 

Redundancy System Update on page 48

Synchronization and Switchover for the 1756-EN2T Modules

You can replace 1756-EN2T modules with 1756-EN2T/D modules without 

using the Redundancy System Update (RSU) feature. You can only do this if the 

module being replaced is a 1756-EN2T module in a system at revision 

20.055_kit1, 20.055_kit2, 20.055_kit3, 20.055_kit4, 20.055_kit5, 20.056_kit1, 

20.057_kit1, 20.058_kit1, or 20.058_kit2.

Complete these steps to replace 1756-EN2T modules with 1756-EN2T/D 

modules.

1. Make sure the existing module and replacement module use the same IP, 

Network Mask, and Gateway addresses.

2. If the Redundancy Module Configuration Tool (RMCT) is not at version 

8.04.01.00, update to version 8.04.01.00.

3. If you are using a 1756-RM2 module, update the firmware to 20.09.

See About the Redundancy Module Configuration Tool on page 7 for 

instructions.

4. In the RSLogix 5000 software, go online with the primary controller.

IMPORTANT Consider the following:

• Before replacing 1756-EN2T/C (or earlier) modules, make sure that you have 

installed the correct firmware on all 1756-EN2T/D modules.

• When you upgrade 1756-EN2T/C (or earlier) modules to 1756-EN2T/D modules, 

you must do so in pairs. If not the system cannot synchronize after a switchover.

• Partnered pairs of 1756-EN2T modules must use the same values for the following 

parameters for IP address swapping to work in the system:

– IP addresses

– Network Mask – Gateway address

2711P-T4W21D8S, 2711P-T4W22D8S, 2711P-T4W21D8S-B, 2711P-T4W22D8S-B, 2711P-T6C21D8S, 2711P-T6C22D8S, 2711P-T6C21D8S-B, 2711P-T6C22D8S-B, 2711P-T7C21D8S, 2711P-T7C22D8S, 2711P-T7C21D8S-B, 2711P-T7C22D8S-B, 2711P-T9W21D8S, 2711P-T9W22D8S, 2711P-T9W21D8S-B, 2711P-T9W22D8S-B, 2711P-T10C21D8S, 2711P-T10C22D8S, 2711P-T10C21D8S-B, 2711P-T10C22D8S-B, 2711P-T12W21D8S, 2711P-T12W22D8S, 2711P-T12W21D8S-B, 2711P-T12W22D8S-B, 2711P-T15C21D8S, 2711P-T15C22D8S, 2711P-T15C21D8S-B, 2711P-T15C22D8S-B

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