6-2
IM 01F06A00-01E
6. OPERATION
6.1.5 Unit of Pulse Output (Scaling)
Pulse output are constructed by two units, that are “Scaled
pulse and Unscaled Pulse”.
(1) Scaled Pulse
When SCALED PULSE is selected in B20, set flowrate per
one pulse output. Rate unit is linking to the flow unit.
(2) Unscaled Pulse
When UNSCALED PULSE is selected in B20, it output
number of vortex (vortex frequency) as a pulse-number,
which is detected from vortex shedder bar. (1.0 must be set
for this.)
Refer to 7.6 (1) Flow calculation.
●
Pulse Rate setting
Pulse rate setting is settable by “B21:PULSE RATE”.
6.1.6 Setting of Burnout Switch
digitalYEWFLO is equipped with a CPU error burnout
function used to set the output direction upon CPU error, and
a sensor burnout function that sets the direction of the output
in the event of burnout of the temperature sensor. When
factory-shipment under normal conditions, the output of both
CPU error burnout and sensor burnout are set to HIGH, but if
suffix code/C1 is specified, the CPU error burnout is set to
LOW(-2.5% below) output, and sensor burnout is set to
LOW(-2.5% below) output, respectively. The setting of the
direction of output from burnout can be changed.
To change the direction of output arising from burnout,
switch the setting pin on the CPU assembly (see Table 6.1).
Table 6.1
Output Setting Pin for Burnout
Pin
position
CPU error
burnout
direction
CPU error
burnout
output
Remark
110% or more
(21.6mA DC)
-2.5% or less
(3.6mA DC)
Set to HIGH before
shipment.
Set to LOW for
option specification
code / C1.
T060101.EPS
HIGH
LOW
H
L
H
L
TP2
COM
HHT
P
F060102.EPS
Pin position of Burnout Switch
Pin position of
Write Protect Switch
(See 6.1.7)
Figure 6.2
Pin position of Burnout and Write Protect
Switch
6.1.7 Setting of Write Protect Switch
By setting the write protect function to “Protect”, it is
possible to prevent the overwriting of parameters. Write
protection can be carried out using either the hardware switch
on the CPU board (i.e., Switch 2) or software parameter
settings. If either of these items is set to “Protect”, the
overwriting of parameters will be prohibited.
NOTE
If the hardware switch is set to “Protect”, it will
not be possible to overwrite parameters; further-
more, this condition will be maintained until the
switch is set to “Enable”.
For more details regarding usage of the write protect function
and the software’s parameter switches, refer to 4.6.11 Write
Protect.
Table 6.3 Setting pin for Write Protect
Pin position
CPU error
burnout direction
T060102.EPS
Enable
Protect
N
Y
N
Y
