Parker
Hannifin
The
Bus State Description
table below gives the possible bus states
and the corresponding CAN LED indicator state. The only normal
states are “READY TO START” and “NETWORK STARTED”. Any red in
the CAN LED indicates a problem.
Bus State Description (parameter P32779)
Bus
State
CAN LED State
PRE-INITIALIZED. The network has not been
initialized yet. This should only happen during
power up or reset. If the CAN LED stays OFF, it
indicates that the ACR9000 did not detect its
internal CAN controller chip.
0 off
PRE_OPERATIONAL. The user’s node information
and bit rate have been verified and the CAN
controller is ready to accept the “start network” bit.
(11265)
1 Blinking
Green
NETWORK STARTED. Successful network start.
2
Solid Green
INVALID MASTER NODE ID. The ACR9000 node ID
must be between 1 and 127 inclusive.
3 Solid
Red
INVALID MODULE NODE INFORMATION. The module
node IDs must be between 1 and 127 inclusive,
must be unique, and not the same as the master
node ID. A maximum of 4 module nodes is allowed.
4 Solid
Red
CHARACTERIZATION ERROR. An expected external
node has not responded to interrogation during
attempt to start network. Will occur if a stated node
ID does not match the actual node ID, or if the
node is missing or at the wrong bit rate or not
operational. The network is still ready to start once
the external node problem is resolved.
5 Blinking
Green
EXCESS BUS ERRORS. The controller chip has too
many bus errors. One possible reason would be
incorrect bit rate on one or more modules.
6
One Red blink
inside blinking
Green
HEALTH EVENT. A node has stopped sending
heartbeat or node guard responses. The errant
node will have a node state of 0 (dead). See table
below. One possible reason would be node receive
overrun caused by a cyclic period that is too fast
for the node.
7
Two Red blinks
inside blinking
Green
INTERNAL ERROR. A firmware or hardware internal
error has occurred on power up or after an attempt
to start the network. Requires factory consultation
8 Blinking
Red
TRANSMISSION OVERFLOW. The amount of data
that must be transferred each cyclic update is
greater than the bit rate allows. Increase the bit
rate or decrease the cyclic rate.
9 Blinking
Red
BUS OFF. The CAN controller is bus off, and the
network must be re-started.
10 Solid
Red
Additional Features 135
