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Why would you spend US$15K on 2 * CEX Modules and a DP-DP coupler to link two AC800M controllers when you can do it for free and with less programming using MMS or Communication variables ?
IF both the controllers are in same XAEnvironment then we can do MMS communication,If it is in different environment then how this will be possible??...
MMS works across different domains and different 800xA systems, different versions and even between 800xA and Sattline. If you can ping the controller, then MMS works.
Existing ES(with PM866) now we have an SCS with PM851A, we want to control the SCS from existing ES if possible, so that to change the programming of PM851 and PM866 with one single point
Just assign a free ip adres to the pm851a, add it to the network. Add the controller in your Control Builder M project. Upgrade the firmware of the controller. create your control code for the new controller and download that. If you need communication between the two controllers you can use mms or iac-mms. IAC-mms is v5.1 or newer.
Please check the network configurationmanual for information: