Schneider Electric Processor Adapter manual Pattern Meaning

Option Adapters

Front Panel Components, Continued

LED Indicator This Option Adapter has one LED indicator, the MB+ ACT indicator. This indicator flashes the following patterns, based on the status of the Modbus Plus node:

Pattern	Meaning
6 flashes/s	This is the normal operating state for the node. It is receiving
	and passing the network token. All nodes on a healthy
	network flash this pattern.
1 flash/s	The node is offline just after power-up or after exiting the
	6 flashes/s mode. In this state, the node monitors the
	network and builds a table of active nodes. After being in
	this state for 5s, the node attempts to go to its normal
	operating state, indicated by 6 flashes/s.
2 flashes, then OFF for 2s	The node detects the token being passed among the other
	nodes, but never receives the token. Check the network for
	an open circuit or defective termination.
3 flashes, then OFF for 1.7s	The node is not detecting any tokens being passed among
	the other nodes. It periodically claims the token but cannot
	find another node to which to pass it. Check the network for
	an open circuit or defective termination.
4 flashes, then OFF for 1.4s	The node has detected a valid message from a node using a
	network address identical to its own address. The node
	remains in this state for as long as it continues to detect the
	duplicate address. If the duplicate address is not detected
	for 5s, the node changes to its 1 flash/s mode.
ON	Indicates an invalid node address.
OFF	Possible fault with Modbus Plus Option Adapter.

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