Yokogawa digitalYEWFLO (DY-FF) - Manual (Page 17)

<4. GETTING STARTED>
4-4
IM 01F06F00-01EN
4.7 Generation of Alarm
If the host is allowed to receive alarms,
generation of an alarm can be attempted from the
digitalYEWFLO. In this case, set the reception of
alarms on the host side. The digitalYEWFLO’s
VCR-7 is factory-set for this purpose. For practical
purposes, all alarms are placed in a disabled status;
for this reason, it is recommended that you fi rst use
one of these alarms on a trial basis. Set the value of
link object-3 (index 30002) as “0, 299, 0, 6, 0”. Refer
to Subsection 5.6.1 “Link Objects” for details.
Since the LO_PRI parameter (index 4029) of the AI
block is set to “0”, try setting this value to “3”. Select
the Write function from the host in operation, specify
an index or variable name, and write “3” to it.
The LO_LIM parameter (index 4030) of the AI block
determines the limit at which the lower bound alarm
for the process value is given. In usual cases, a
very small value is set to this limit. Set smaller value
than 100% value of XD_SCALE (same unit). Since
the fl ow rate is almost 0, a lower bound alarm is
raised. Check that the alarm can be received at the
host. When the alarm is confi rmed, transmission of
the alarm is suspended.