11.8
Guarding
Guarding response:
The inverter responds to every guarding request of the PLC. This is used by some
PLCs when powering on to search for available devices. This response is done always
independent of the settings of objects
Guarding activation:
The Guarding is set whenever objects
are both unequal 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
Guarding sequence:
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
Inverter:
Byte 0
Identifier
NMT state + toggle bit
0x700 + Node-ID
7
6
5
4
3
2
1
0
t
NMT state
t:
Toggle bit toggled on each transmission (first transmission t = 0)
NMT state:
0
Boot-Up
4
Stopped
5
Operational
0x7F (=127)
Pre-Operational
04/13
CM-CAN ACU
41
Summary of Contents for Vectron Active Cube
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