Yokogawa AXFA14G/C - Manual (Page 49)

IM 01E20C02-01E 6-20
6. PARAMETER DESCRIPTION
(5) Menu F: Status Functions Setting items
Menu F contains setting items relevant to status Input/Output functions.
[F20: DO Function] Setting of the function for the DO status output terminal
This parameter sets the function for the DO (status output) terminal.
Setting
No Function Stops output (i.e., inactive condition) As no function is set, there is no output.
Warning Output Output upon warning
Total Switch(O) Totalization switch output
Refer to Alarms (Section 6.5).
Pulse Output Pulse output
Alarm Output Output upon alarm
Pulse output is carried out.
H/L Alarm(O) H/L alarm output
HH/LL Alarm(O) HH/LL alarm output
Fwd/Rev Rngs(O) Forward/reverse flow rate measurement
Auto 2 Rngs(O) Automatic 2 ranges switching
Auto 3 Rngs(O) Automatic 3 ranges switching (Note 1)
Auto 4 Rngs(O)
Ext 2 Answer(O)
Automatic 4 ranges switching (Note 1)
Answerback: 2 ranges switching via
external status input
When flow is in the reverse direction, switching to the reverse
range is carried out automatically, measurement is performed,
and status output is carried out.
When range switching is carried out in response to external
status input, status output is performed in the form of an
answerback to indicate the range currently being used.
Description Function
T0622.EPS
Note 1: When these functions are selected, two terminals become necessary for status output, the DO and DIO
terminals which cannot be used for other functions. Accordingly, the setting for F20: DO Function is
automatically adopted as the setting for F21: DIO Function. (Setting of these two functions is not possible
using F21: DIO Function.)
This function ensures that when the instantaneous flow
rate exceeds 100% of the range, transition to the next
range is carried out automatically. Status output is carried
out upon range switching.
Status output is carried out when the instantaneous flow rate
equals or falls below the low flow rate limit (L), or when it equals
or exceeds the high flow rate limit (H). These limit values are
determined using G10: Low Alarm and G11: High Alarm.
Status output is carried out when the instantaneous flow rate equals
or falls below the low-low flow rate limit (LL), or when it equals or
exceeds the high-high flow rate limit (HH). These limit values are
determined using G12: Low Low Alarm and G13: High High
Alarm.To output “HH/LL Alarm” as an alarm, set G33: Alm-
HH/LL to “Yes.”
Status output is carried out when the forward internal
totalized value reaches or exceeds the totalization switch value.
The totalization switch value is determined using D23: Ttl
Switch Lower and D24: Ttl Switch Upper.