Nmt Boot-Up / Error Event Handling - Mitsubishi Electric MELSEC L-Series User Manual

Functions
4.8.7

NMT boot-up / Error event handling

When the consumer heartbeat time elapses, node guarding fails or the NMT Slave responds with an
unexpected node state, the NMT master handles the NMT Slave as shown in the following figure.
If the NMT master receives a boot-up message from an assigned NMT Slave, the NMT slave will be
started up by the NMT start-up master (refer to section 4.8.2). If the NMT master is in NMT state
stopped, the NMT start-up master will not be able to start the NMT slave.
OD Index
1F81
OD Index
1F81
OD Index
1F80
OD Index
1F81
OD Index
1F80
Fig. 4-34: NMT error handler
4 – 46
Start NMT error handler
Bit 0
H
Bit 3
H
Node is mandatory and
all nodes shall be stopped?
Bit 6
H
Bit 3
H
Node is mandatory and
all nodes shall be reset?
Bit 4
H
Start startup handler for
No
Node is assigned
NMT Slave
Yes
Yes
No
Yes
No
NMT service
Reset communication
faulty node
faulty device
End error handler
Network Management
NMT service
Stop all devices
NMT service
Reset communication all
devices
MITSUBISHI ELECTRIC