Schneider Electric 174 CEV manual Verifying the Network Communication, Ethernet Card Indicators

Installing the Bridge Hardware

2.7Verifying the Network Communication

Refer to Figure 8 for the locations of the bridge’s indicators.

2.7.1Ethernet Card Indicators

The Ethernet card has an indicator that shows a valid connection between the card’s RJ--45 (UTP) jack and the network. It has another indicator which flashes to show’s the bridge’s communication activity on the Ethernet link.

Table 11 Ethernet Card Indicators

Indicator (Green)	Status
RJ--45 Connection Valid	Valid connection exists at RJ--45 port.
TCP/IP Network Active	Bridge is actively communicating TCP/IP.

2.7.2Modbus Plus Card Indicators

The Modbus Plus card has an indicator that flashes a repetitive pattern to show its network communication status, plus two indicators which identify communication errors on the two Modbus Plus cable paths. Note that one error indicator will be lit normally in single--cable installations, showing that a second cable does not exist.

Table 12 Modbus Plus Active Indicator Patterns

Indicator Pattern (Green)	Status
Six flashes/second	Normal operating state. All nodes on a
	healthy network flash this pattern.
One flash/second	The node is off-line. After being in this state
	for 5 seconds, the node attempts to go to its
	normal operating state.
Two flashes, then OFF for 2 seconds	The node detects the network token being
	passed among other nodes, but it never
	receives the token.
Three flashes, then OFF for 1.7 seconds	The node does not detect any token passing
	on the network.
Four flashes, then OFF for 1.4 seconds	The node has detected another node using
	the same address.

Table 13 Modbus Plus Channel Error Indicators

Indicator (Red)	Status
Error Channel A	Communications error at network port A.
Error Channel B	Communications error at network port B.

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