Controls the behavior when field device discovery is started. When this value is True, any devices which were previously discovered or already mapped remain in the list of discovered devices, without any attempt to reestablish communication with them. If this value is False, an attempt is made to reestablish communication with all devices, and devices which do not respond are not shown in the list of discovered devices. Set this value to False to rediscover devices which have been re-addressed on the network.
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