Yokogawa AXFA14G/C - Manual (Page 52)

IM 01E20C02-01E 6-23
6. PARAMETER DESCRIPTION
NOTE
Multiple ranges setting
Parameters from F30 to F41 are used with the
automatic multiple ranges and the multiple
ranges switching via an external status input.
The followings will describe the setting method
for each range.
The multiple ranges use the following parameters:
[B23: Flow Span] Setting of the flow rate span
(Setting of the forward No.1 range)
[F30: Forward Span 2] Setting of the forward No.2
range
[F31: Forward Span 3] Setting of the forward No.3
range
[F32: Forward Span 4] Setting of the forward No.4
range
[F33: Reverse Span 1] Setting of the reverse No.1
range
[F34: Reverse Span 2] Setting of the reverse No.2
range
[F40: Auto Range Hys] Setting of the automatic
multiple ranges hysteresis width.
[F41: Bi Direction Hys] Setting of the forward/
reverse flow measurement hysteresis width
Multiple Ranges Setting 1:
Automatic multiple ranges switching
᭿ When the instantaneous flow rate exceeds 100% of
the range, transition to the next range (up to four
ranges) is carried out automatically. Furthermore,
when the flow is in reverse, the reverse range is
automatically selected.
᭿ Range switching can be confirmed according to the
status of the DO and DIO status output terminals.
Refer to Table 6.4.1: Status Output for Automatic
Multiple Ranges Switching for details of status
output conditions for each range.
Status Output for Automatic Multiple Ranges
Switching
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 6.4.1 Status Output for Automatic Multiple Ranges
Switching
T0627.EPS
*: “No Function” is the default value. Only DO or DIO terminals are
used for single or dual ranges; accordingly, the unused terminal
remains at the default value (i.e., No Function) and can therefore
be used for other functions.
*: “DIO (O)” indicates DIO function is used for output.
Parameter setting
Function
F20
Status output
DIO (O) DIO (I)
DIO
–
–
–
Open
Closed
–
–
Open
Closed
Open
Open
Closed
Open
Open
Closed
Closed
Open
Closed
Open
Closed
Open
Open
Closed
Closed
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
DO
–
Open
Closed
–
–
Open
Closed
–
–
Open
Closed
Open
Open
Closed
Open
Closed
Open
Open
Closed
Closed
Open
Closed
Open
Closed
No
Function
Fwd/Rev
Rngs (O)
No
Function
Auto 2
Rngs (O)
No
Function
Auto 3
Rngs (O)
Auto 4
Rngs (O)
Fwd/Rev
Rngs (O)
Auto 2
Rngs (O)
F21
No
Function
No
Function
Fwd/Rev
Rngs (O)
No
Function
Auto 2
Rngs (O)
Auto 3
Rngs (O)
Auto 4
Rngs (O)
Auto 2
Rngs (O)
Fwd/Rev
Rngs (O)
Forward single
range
Auto forward/
reverse 1 range
Auto forward
2 ranges
Auto forward
3 ranges
Auto forward
4 ranges
Auto forward/
reverse 2 ranges
Forward
Reverse
Forward
Reverse
Forward 1 range
Forward 2 range
Forward 1 range
Forward 2 range
Forward 1 range
Forward 2 range
Forward 3 range
Forward 1 range
Forward 2 range
Forward 3 range
Forward 4 range
Forward 1 range
Forward 2 range
Reverse 1 range
Reverse 2 range
Forward 1 range
Forward 2 range
Reverse 1 range
Reverse 2 range