ProSoft Technology 5301-MBP-ASCII - Manual (Page 34)

LED Indicators MBP ♦ ProLinx Gateway
Protocol Manual Modbus Plus
Page 34 of 52 ProSoft Technology, Inc.
May 12, 2011
5.1 LEDs for the Modbus Plus Port
The following table lists LED status descriptions of the Modbus Plus module.
LED Status Indication
ACT
(Green) 6 flashes per second. The Modbus Plus is working normally in that it is
successfully receiving and passing the token. All
nodes on the link should be flashing in this
pattern.
1 flash per second This node is off-line after just being powered up,
or after exiting the four flashes per second
mode. In this state, the node monitors the
network and builds a table of active nodes and
token-holding nodes. It remains in this state for 5
seconds, then attempts to go to its normal
operating state.
2 flashes, then OFF for 2
seconds The node is hearing the token being passed
among other nodes, but is never receiving the
token. Check the network for an open circuit or
defective termination.
3 flashes, then off for 1.7
seconds The node is not hearing any other nodes. It is
periodically claiming the token but finding no
other node to pass it to. Check the network for
an open circuit or a defective termination.
4 flashes, then OFF for
1.4 seconds The node has heard a valid message from
another node that is using the same address as
this node. The node remains in this state as long
as it continues to hear the duplicate address. If
the duplicate address is not heard for 5 seconds,
the node then changes to the pattern of one
flash every second.
ERR
(RED) Off Normal State: When the error LED is off and the
port is actively transferring data, there are no
communication errors.
Blink If the LED blinks momentarily, a message error
has been detected on the cable path.
On If the LED is on steady, a hard fault has occurred
either in the cable or in a node device connected
to the cable. Also, the LED will be on steady if
none of the commands in the Master Command
list are successfully being completed.