Yokogawa AXFA14G/C - Manual (Page 54)

IM 01E20C02-01E 6-25
6. PARAMETER DESCRIPTION
Multiple Ranges Setting 2:
Multiple ranges switching via external
status input
᭿ For both the forward and reverse directions, switch-
ing of up to two ranges can be carried out based on
a status input; however, switching between direc-
tions is not possible. Switching between forward
and reverse ranges is carried out automatically only
when the flow direction reverses.
᭿ DIO terminal is used for multiple ranges switching.
For more details, refer to Table 6.4.2: Multiple
Ranges Switching via External Status Input.
Multiple Ranges Switching via External Status
Input
Operations are performed in accordance with the
following table when the active mode has been set to
“Closed (On) Act” using F22: DO Active Mode or
“Closed/Short Act” using F23: DIO Active Mode.
Operating patterns are reversed when the active mode
has been set to “Open (Off) Act” using F22: DO
Active Mode or “Open/Open Act” using F23: DIO
Active Mode.
Table 6.4.2 Multiple Ranges Switching via External Status
Input
T0628.EPS
*: “No Function” is the default value. Only DIO terminal is used for
dual ranges; accordingly, the unused DO terminal remains at the
default value (i.e., No Function) and can therefore be used for
other functions.
*: “DIO (I)” indicates DIO function is used for input.
Parameter setting
Function
F20
Status output
DIO (O) DIO (I)
DIO
Open
Short
Open
Short
Open
Short
Open
Short
–
–
–
–
–
–
–
–
DO
–
–
Open
Open
Closed
Closed
Open
Closed
No
Function
Fwd/Rev
Rngs(O)
Ext 2
Answer(O)
F21
Ext 2
Ranges(I)
Ext 2
Ranges(I)
Ext 2
Ranges(I)
External forward
2 ranges
External forward/
reverse 2 ranges
External forward
2 ranges, with
answerback
Forward 1 range
Forward 2 range
Forward 1 range
Forward 2 range
Reverse 1 range
Reverse 2 range
Forward 1 range
Forward 2 range
Parameter setting sequence
(for multiple ranges switching via external
status input)
F20: DO Function
Select a function. F21: DIO Function
Select a function.
F23: DIO Active Mode
Select whether DIO input is
to be “Closed/Short Act”
or “Open/Open Act”.
Select a function (Note 1)
No Function: Function is stopped (other functions may be selected)
Fwd/Rev Rngs(O): Forward/reverse flow rate measurement
Ext 2 Answer(O): Answerback; 2-ranges switching via external
status input
Ext 2 Ranges(I): 2-ranges switching via external status input
Refer to Table 6.4.2 and set F20 or F21.
Note 1: "DIO (O)" indicates DIO function
is used for output and "DIO (I)"
for input.
F0607.EPS
F22: DO Active Mode
Select whether DO output is
to be “Closed (On) Act” or
“Open (Off) Act”.
F34: Reverse
Span 2
Reverse No.2 range
F33: Reverse
Span 1
Reverse No.1 range
F30: Forward
Span 2
Forward No.2 range
B23: Flow
Span
Forward No.1 range
If “instantaneous flow rate % (FR)” is selected for Display
Mode and A10: FLOW RATE (%) is selected for BRAIN
communication, the instantaneous flow rate % and following
symbols will be displayed only for multiple ranges and
forward/reverse flow measurement.
Forward No.1 range: [F1]
Reverse No.1 range: [R1]
Forward No.2 range: [F2] Reverse No.2 range: [R2]
Set the spans for the ranges to be used.
No.1 range
ϹNo.2 range
[F40: Auto Range Hys] Setting of automatic range-
switching hysteresis width
Automatic switching takes place for multiple range
switching when 100% of the range is exceeded, and
this parameter allows a hysteresis width to be set for
this switching.
Refer to Figure 6.4.1: Multiple Ranges and Hysteresis
Widths.
[F41: Bi Direction Hys] Setting of forward/reverse
flow measurement hysteresis width
This parameter sets the hysteresis for forward/reverse
flow rate measurement as a % value of the minimum
flow span.
Refer to Figure 6.4.1: Multiple Ranges and Hysteresis
Widths.