Yokogawa EJX115A - Manual (Page 40)

<6. Explanation of Basic Items>
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IM 01C25T04-01EN
6.4.2 Target Mode
The Target modes permitted for the AI function
block are Automatic (Auto), Manual (Man), and
Out of Service (O/S). When the Target mode of PB
(Physical 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.
6.4.3 Basic Parameter of AI function block
Output Value (OUT)
The function block parameter OUT contains the
current measurement value in a vendor specific
or configuration adjusted engineering unit and the
belonging status in Auto Mode. Also contains the
value and status set by an operator in Man Mode.
Simulation (SIMULATE)
Simulation parameter is to simulation mainly for
checking arbitrarily set the value and input status
from SENSROR Transducer block.
PV Scale (PV_SCALE)
Conversion of the process variable into percent
using the high and low scale values.
Linearization type (LIN_TYPE)
Linearization type of output signal can be select
from Linear or Square root. Linearization type of
AI function block can apply to have different output
mode for display and output signal. (For example,
Display mode: Square root, Output mode: Linear)
Out Scale (OUT_SCALE)
Scale of the process variable. This parameter
contains the values of the lower limit and upper limit
effective range, the code number of the engineering
unit of process variable and the useful number of
digits on the right hand side of the decimal point.
Filter Time Const (PV_FTIME)
Damping time of the process variable.
Fail Safe Mode (FSAFE_TYPE)
Fail Safe Mode is parameter used to define the
reaction of the device, if a BAD status of signal to
AI function block (OUT.Status and OUT.Value) is
detected. This is available only when Target Mode
of AI function block is in “Auto”. Refer to 5.4.1 for
configuration.
Table 6.2 Fail Safe Mode (Classic Status)
Fail Safe Mode Output Value and Status (Quality)
Default value is
used as output
value
value Fail Safe Default value
Status UNCERTAIN - Substitute Value
Storing last valid
output value
value Last stored valid OUT value
Status UNCERTAIN - Last Usable Value
The calculated
output value is
incorrect
value wrong calculated value
Status BAD - *(* as calculated)
Table 6.3 Fail Safe Mode (Condensed Status)
Fail Safe Mode Output Value and Status (Quality)
Default value is
used as output
value
value Fail Safe Default value
Status BAD - Passivated, Constant *
1
UNCERTAIN - Substitute Set * 2
UNCERTAIN - Process Related * 3
UNCERTAIN - Substitute Set * 4
Storing last valid
output value
value Last stored valid OUT value
Status BAD - Passivated, Constant *
1
UNCERTAIN - Substitute Set * 2
UNCERTAIN - Process Related * 3
UNCERTAIN - Substitute Set * 4
The calculated
output value is
incorrect
value wrong calculated value
Status BAD - Passivated, Constant *
1
BAD - Maintenance Alarm * 2
BAD - Process Related * 3
BAD -Function Check * 4
*1: When input status = BAD - Passivated
*2: When input status = BAD - Maintenance Alarm
*3: When input status = BAD - Process Related
*4: When input status = BAD - Function Check
6.5 Totalizer Function Block
6.5.1 Functional Block
The Totalizer function block, incorporates
analog signal from SENSOR transducer block,
performs integrate a rate or another quantity to
the corresponding integral. And also, this function
block can be tailored for different applications or
determines the fail-safe behavior.
6.5.2 Target Mode
The Target Mode permitted for the Totalizer function
block are Automatic (Auto), Manual (Man), and Out
of Service (O/S).