11.9 Heartbeat
The heartbeat uses the producer/consumer method. The inverter as heartbeat con-
sumer can monitor up to three heartbeat producers. The inverter can
also send the
heartbeat message (as heartbeat producer). The heartbeat contains the NMT state
of the producer.
The heartbeat consumer function is set by object 0x1016/n
Consumer Heartbeat
Time
. After setting the object the
Monitoring of the heartbeat message(s) starts
with reception of the first heartbeat message.
If the inverter does not receive a producer heartbeat message
consumer heartbeat time, a heartbeat event is triggered. The reaction to this heart-
beat event is defined by objects
0x6007
abort connection option code
and 0x1029
The heartbeat producer function is set by object 0x1017
Producer Heartbeat Time
.
If object 0x1017
Producer Heartbeat Time
is set unequal to zero the inverter sends
a heartbeat message periodically.
11.10 OS Synchronization
The operating System (OS) of the frequency inverter can be synchronized to the
PLC or other devices. The synchronization of the OS enhances the performance of
the complete plant. Synchronization is used to eliminate phase
deviations of the
CPUs between master and slave devices, so that calculations are done at the same
time. Note, that only small deviations of the CPU clock frequencies between devices
(i.e. different CPU Quartz cock frequencies) of ± 1 ‰ can be compensated. The
synchronization time must be natural number as multiplier from 1 ms.
Synchronization via CANopen:
When using CANopen
®
without Systembus, the synchronization can be switched on
and off. Synchronization can be done with CANopen
®
SYNC telegrams.
Synchronization via Systembus:
When using CANopen
®
simultaneously
with Systembus, the synchronization can be
set to either CANopen, Systembus or it can be switched off.
Synchronization can be
done with Systembus SYNC telegrams or Systembus RxPDO telegrams.
Note: When synchronizing the OS via CANopen
®
, the master has to support the
synchronization mechanisms of CANopen
®
42 CM-CAN ACU 04/13