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Is there any set of rules/guidance/best practices for seperating Modbus devices that are communicating to a single Master? I have project were there are several Modbus TCP/IP devices that are connected to the host DCS through a modbus TCP card. This card can handle up to 256 devices, but due to concern of failure, etc., it is preferred to separate these device out onto multiple cards. I'm looking for suggestions/best practices that could be used as a design guideline for determining what devices will go together on what card based on controlled equipment, device type, manufacturer, interface criticallity, etc.