Lenze E94ARNE Regenerative power supply - Manual (Page 134)

9400 regenerative power supply module | Parameter setting
"CAN on board" system bus
Monitoring
134
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EDS94ARNExxxx EN 2.3 - 06/2014
6.9 Monitoring
6.9.1 Node guarding protocol
The node guarding protocol is used to monitor the connection between the NMT master
and the NMT slave(s) within a CAN network. If the regenerative power supply module has
been parameterised as an NMT master, it can monitor a maximum of 32 NMT slaves.
Schematic procedure
[6-9] Node guarding protocol
1. At cyclic time intervals, the NMT master sends a data telegram referred to as “remote
transmission request” (RTR) to the NMT slave.
2. The NMT slave then sends a response telegram back to the NMT master.
t: toggle bit
s: NMT slave state (4:stopped, 5: operational, 127: pre-operational)
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