Yaskawa Remote I/O Controller LAN Node PCB for use with Microtrac DSD LAN - Manual (Page 6)

6
following case:
A drive sees that an RIO is powered
up (by the RIO announcing that it is
powered up). The drive then sends a
message to allocate an output with a
given output time and a fault reaction.
The drive then proceeds to send output
update messages to update the allocated
output, at time intervals which are less
than the given output time. For some
unforseen reason, the drive does not
send the RIO an update message within
the given output time. Some time later,
the drive resumes sending the RIO
output update messages.
In this case, when the output timer
timed out, the output would have been
driven to 0. When the drive resumes
sending the RIO output update messages,
the RIO will react differently depending on
how the fault reaction was defined. Had
Allocate been defined as the fault reaction,
then the output value would have been set
to the value in the message. Had Deallocate
been defined as the fault reaction, then the
output update messages received from the
drive, after the fault, would be ignored (since
the output is no longer allocated to the
drive). Deallocate would require the drive to
allocate the output again, which would
mean reseting the drive or power cycling the
RIO.
LED STATES
The LED on the RIO is used to
indicate the operating status of the RIO.
RIO OPERATING
LED STATE STATUS
On, steady Power is applied, and the
RIO software is executing.
On, blinking Power is applied, the RIO
software is executing, and
the RIO is receiving LAN
messages.
Off Power is not applied, or
power is applied and the
RIO has experienced a
fault and has halted
execution.
RD 790-10