Modbus Plus Led - ABB NMBP-01 Installation And Startup Manual

Modbus Plus LED

Installation and Start-up Guide for NMBP-01
The NMBP-01 module has the standard Modbus Plus diagnostic LED. This
LED has the status codes shown in Table 7-2 below.
Flash Code
flash every This node is working normally in
160ms that it is successfully receiving and
passing the token. All nodes on the
link should be flashing this pattern.
flash every This node is in the
1 second MONITOR_OFFLINE state,
where it must monitor the link for 5
seconds, and it is not allowed to
transmit any packets out onto the
link. During this time it hears all
other active nodes on the link, and
builds the active station table.
2 flashes, off This node is permanently in the
2 seconds MAC_IDLE never-getting-token
state, and it is hearing other nodes
on the link pass the token to them-
selves, but the token is never
passed to this node. This node may
have a bad transmitter.
3 flashes, off This node is not hearing any other
1.7 seconds nodes, so it is periodically claiming
and winning the token, and then
finding no other node to pass it to.
It could be that this node is the only
node on the link, or that there really
are no other active nodes on the
link, or this node has a bad receiv-
er. In the latter case, this node will
periodically disrupt communica-
tion on the link.
4 flashes, off This node has heard a valid packet
1.4 seconds that was duplicate-node-address
sent from another node on the link
that is using the same link address
as this node. This node is now in
the DUPLICATE_OFFLINE state
where it will remain passively
monitoring the link, until the dupli-
cate node is not heard from for
5 seconds.
Table 7-2 Modbus Plus Status LED.
Chapter 7 – Fault Tracing
Status
NMBP-01 initialising.
Wait for 5 seconds.
Switch module power off
and on. If the problem per-
sists, replace the module.
Check the Modbus Plus
connection and wiring.
Verify that there are other
nodes on the network. If the
problem is not cleared, re-
place the module.
Check the Modbus Plus
node numbering for the
whole network. Renumber
conflicting nodes, so that
each node has a unique
node number.
Correction
7-3