CANopen Agile
06/2010
28
Protocol
8.8
Guarding
Guarding response:
The inverter responds to every guarding request of the PLC. This is used by some PLCs when po-
wering on to search for available devices. This response is done always independent of the settings
of objects
0x100C/0 Guard Time
and
0x100D/0 Lifetime Factor
.
Guarding activation:
Guarding is set whenever objects
0x100C/0 Guard Time
and
0x100D/0 Lifetime Factor
are both un-
equal to zero. The resulting guarding time is
Guard Time x Lifetime Factor. Guarding is activated
after setting the objects and on reception of the first guarding request.
Guarding fault behavior:
If the inverter does not receive a guarding request within the specified guarding time a guarding
event is triggered. The inverter's reaction to this guarding event is defined by Objects
0x6007/0
Abort Connection option code
and
0x1029/n Error Behavior
.
Guarding process:
The PLC sends via a RTR (Remote Transmission Request) a guarding request with Identifier 0x700
(= 1792) + Node-ID (no data bytes). This remote frame is answered by the inverter with the same
Identifier and one data byte. The data byte contains a toggle bit and the NMT state of the inverter.
PLC:
Identifier
0x700 (=1792) + Node-ID RTR
Frequency inverter:
Byte 0
Identifier
NMT State + Toggle Bit
0x700 + Node-ID
7
6
5
4
3
2
1
0
t
NMT State
t:
The toggle bit is toggled on each transmission (first transmission: t = 0)
NMT State:
0
Boot-Up
4
Stopped
5
Operational
0x7F (=127)
Pre-Operational
Содержание Bonfiglioli Vectron Agile
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