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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 ACR90x0 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 ACR90x0 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
Appendix E CANopen 137
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Summary of Contents for ACR9000
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