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Old February 12th, 2015, 05:33 AM   #1

minaykha is offline
Join Date: Apr 2009
Location: singapore
Posts: 96
1756-RM/B, Redundancy System Configuration problem


Currently, I am configuring Redundancy system in one of my project and facing with a problem ( Secondary Module always show DISQ and canít synchronize with Primary PLC ).

Following are products and versions which I am using in our system.

PLC : 1756-L75 ,

RsLogix 5000 : Rev 21

RsLinx Classic : Rev 3.7

Redundancy Module : 1756-RM/B.

Please refer to attachment pictures for more details of redundancy modules.

I go trough manual and found that I should have RMCT ( Redundancy Module Configuration Tool ) to configure the redundancy module.(Please refer to pix, Manual_RMCT)

But, when I follow the manual , open Rslinx and right click on the module, there is no "Configuration module" , that is why I can't configure the module.

Could anyone please advise how can I get RMCT and its features ?

Thank you,
Attached Images
File Type: jpg 1756-RM_A.jpg (35.3 KB, 11 views)
File Type: jpg 1756-RM_B.jpg (35.5 KB, 8 views)
File Type: jpg Manual_RMCT.JPG (36.9 KB, 8 views)
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Old February 12th, 2015, 09:17 AM   #2
United States

ohnedich6 is offline
Join Date: Jun 2014
Location: Upstate SC
Posts: 45

If you are using a L75 with the firmware of v21 you cannot use redundancy. The ability to use redundancy ends at v20 on the Allen-Bradley PLCs. Download the Firmware Redundacy kit v20.54 or v20.55 (see the end of my post for a link) either of these downloads should give you all the applicable firmwares that you will need for the processors, redundancy cards, ethernet card etc.


Hope this helps.

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Old February 13th, 2015, 05:16 AM   #3

minaykha is offline
Join Date: Apr 2009
Location: singapore
Posts: 96
Hi Nathan,

Thank and appreciate your respond and info.

I just want to share my experience,
I unchecked "Unicast Connection option" under connection tab in MNET module properties dialogue box.After that, my primary and secondary can synchronize.
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