Nmt Error Control Status (Un\G401-Un\G527) - Mitsubishi Electric MELSEC L-Series User Manual

Programmable logic controllers
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Detailed Description of the Module
3.5.15
NMT Error Control Status (Un\G401–Un\G527)
The buffer memory addresses Un\G401 to Un\G527 display the Node Guarding and Heartbeat status.
Address
(Decimal)
401
402
403
404
:
526
527
The bit allocation of each buffer memory address is as follows. The description applies to the case that
the relevant bit is set to "1".
Bit
0
1
2
3
4
5
6
7
8 to 15 Reserved
Tab. 3-17: Assignment of the bits in the buffer memory addresses 401 to 527
If one of the bits 2 to 7 is turned ON, the signal "NMT error of CANopen€ node available" (X(n+1)0) will
turn ON.
Clearance of errors
● To clear the error of all nodes, write 0000
CANopen€ node request (Y(n+1)0).
● To clear the error of a node, write the node number to Un\G400 and turn ON the Clear NMT error
of CANopen€ node request (Y(n+1)0).
3 – 22
Description
Node 1 status
Node 2 status
Node 3 status
Node 4 status
:
Node 126 status
Node 127 status
Description
Guarding
Heartbeat
Guarding
Guarding
NMT startup failed.
Guarding
Guarding
Heartbeat
Tab. 3-16:
Allocation of the buffer memory addresses
Un\G401 to Un\G527
Node Guarding is active
Heartbeat is active (Will be set after the reception of the first heartbeat message.)
One node guarding message is missed or toggle bit error.
No response and lifetime of NMT Slave elapsed
The node has not the expected state.
Guarding failed.
Node Guarding remote requests of the NMT Master was not received in the
expected time.
Heartbeat is missing
to Un\G400 and turn ON the Clear NMT error of
H
Buffer Memory Details: CANopen€ Mode
MITSUBISHI ELECTRIC

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