Momentum Modbus Plus 170 PNT Series Guía de usuario Pagina 71

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Overview of Momentum Option Adapters
870USE10110 July 2004 71
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:
Modbus Plus
Address
Switches
The two rotary switches on the option adapter are used to set a Modbus Plus node
address for the CPU module. The switches are shown in the following illustration.
Their usage is described in detail on p. 144.
The switches in this illustration are set to address 14.
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.
0
1
2
3
4
5
6
7
8
9
0
1
2
3
4
5
6
7
8
9
X10
X1
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