Operating instructions

16 08/06
4.8 Master functionality
An external control or an frequency inverter defined as a master (node ID = 0) can be
used as a master. The fundamental tasks of the master are controllin
g
the start of the
network (boot-up sequence), generating the SYNC telegram and evaluating the emer-
gency messages of the slaves.
Further, there can be access to the parameterization of all the frequency inverters on
the system bus by means of a field bus connection via the client SDO of the maste
r
frequency inverter.
4.8.1 Control boot-up sequence, network management
The Minimum Capability Boot-Up method defined accordin
g
to CANopen is used fo
r
the state control of the subscribers (nodes).
This method knows the pre-operational, operational and stopped states.
After the initialization phase, all the subscribers are in the pre-operational state. The
system bus master transmits the NMT command Start-Remote-Node. With this
command, individual nodes or all the nodes can be started together. An frequency
inverter defined as a master starts all the nodes with one command. After receipt o
f
the Start Remote Node command, the subscribers chan
g
e into the Operational state.
From this time on, process data exchange via the PDO channels is activated.
A master in the form of a PLC/PC can start the subscribers on the system bus indi-
vidually and also stop them again.
As the slaves on the system bus need different lengths of time to conclude their ini-
tialization phases (especially if external components exist alon
g
side the frequenc
y
inverters), an ad
j
ustable delay for the chan
g
e to Operational is necessary. The settin
g
is done in an frequency inverter defined as a system bus master via Boot-Up Delay
904.
Parameter Setting
No. Description Min. Max. Factory setting
904 Boot-Up Delay 3500 ms 50000 ms 3500 ms
Properties of the states:
State Properties
Pre-Operational Parameterization via SDO channel possible
Exchange of process data via PDO channel not possible
Operational Parameterization via SDO channel possible
Exchange of process data via PDO channel possible
Stopped Parameterization via SDO channel not possible
Exchange of process data via PDO channel not possible
Note: Start-Remote-Node is cyclically transmitted with the set delay time by an
frequency inverter defined as a system bus master, in order to put slaves
added with a delay or temporarily separated from the network back into
the Operational state.