Link relays are used for comms, W words & B bits are very often used for network comms i.e. Latch relays or bits are the Data memory & M bits these can be set to retentive, in the project tree go to plc parameters and one of the last tabs are parameters there you can set the areas that retain data when plc in stop or powered down, on FX D200-255 are usually retentive by default but you can change this from D000 to Dxxx this applies to various other memory areas.
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