Yokogawa EJX930A - Manual (Page 54)

<6. Explanation of Basic Items>
6-15
IM 01C25R03-01E
Scaling
OUT_SCALE
Filter
PV_FTIME
Cutoff
LOW_CUT
L_TYPE
Simulate
SIMULATE.
Transducer Value
SIMULATE.Enable
Simulate
SIMULATE.
Simulate Value
Scaling
XD_SCALE
FIELD_VAL.Value
IO_OPTS.Low cutoff
OUT_D_SEL
PV.Value
MODE_BLK.Actual
Alarms
LO, LO_LO
HI, HI_HI
/100
/100
Disable Enable
Direct
Indirect
=0(Disable)
Auto =1(Enable)
OUT
OUT_D
Ind.Sqr Root
F0608.ai
Figure 6.5 Diagram of the AI Functional Block
6.6.2 Block Mode
The Block modes permitted for the AI function
block are Automatic (Auto), Manual (Man), and
Out of Service (O/S). When the Block mode of RB
(Resource Block) is Out of Service (O/S), Actual
is Out of Service (O/S) even if Automatic (Auto) or
Manual (Man) is written to Target.
6.6.3 IO_OPTS
IO_OPTS is a parameter used to select whether
options regarding input and output signals should
be enabled or disabled. In the case of the AI
function block, the only available option is “Low
cutoff”. When enabling the low cut function for
outputs, set this option.
6.6.4 STATUS_OPT
STATUS_OPT is a parameter to select options
regarding the status of signals. The AI function
block offers four options: Propagate Fault Forward,
Uncertain if Limited, BAD if Limited, and Uncertain if
Man mode.
Propagate Fault Forward
If the status from the sensor is Bad, Device failure
or Bad, Sensor failure, propagate it to OUT without
generating an alarm. The use of these sub-statuses
in OUT is determined by this option. Through this
option, the user may determine whether alarming
(sending of an alert) will be done by the block or
propagated downstream for alarming.
Uncertain if Man mode
When the “Uncertain if Man” is enabled and the
Actual mode is Man, the OUT signal status should
be “Uncertain”.
6.6.5 OUT_D
OUT_D.value is “1” when the alarms selected by
OUT_D_SEL occur.
OUT_D.status is linked OUT.status. OUT_D.value
can be written the value form 0 to 15 when block
mode is O/S or MAN mode. The OUT_D_SEL
options are shown below.
High High Alarm (1):
OUT_D.value will be “1” when HI_HI alarm
occurs.
High Alarm (2):
OUT_D.value will be “1” when HI alarm
occurs.
Low Low Alarm (4):
OUT_D.value will be “1” when LO_LO alarm
occurs.
Low Alarm (8):
OUT_D.value will be “1” when LO alarm
occurs.