Appendix
2
02
0-
11
163
8.2.4
Digital input (DI) Function Block
Parameters
Parameter
Char.
Description
ST_REV
During each writing process to a parameter marked
with "S", the parameter ST_REV is increased by 1.
TAG_DESC
W, S
Via this parameter, a tag (measuring point designa
-
tion) can be assigned to the valve interface in the
plant or process.
STRATEGY
W, S
The strategy field can be used to identify comprising
blocks. This data is not controlled or used by the
block.
ALERT_KEY
W, S
Identification number of the plant component. This
information can be used by the control PC, e.g., to
sort alarms. Valid values are 1 ... 65536.
MODE_BLK
W, S
Displays the current, allowed, normal mode and the
target mode of the block. The target mode can be set
to the values "Auto", "Man" or "Out of Service".
BLOCK_ERR
Displays diagnostic messages of the block.
PV_D
Channel value with optional inversion (IO_OPTS)
and filtering applied to it (PV_FTIME).
OUT_D
W, Man
The actual output value. When the block is in AUTO
mode, this is equal to PV_D. If the block is in manual
mode, the parameter is writeable.
SIMULATE_D
W, S, OOS Using this structure, the simulation can be activated
or deactivated. If the simulation is activated, this
parameter determines FIELD_VAL_D. The simula
-
tion can only be activated with the associated
switch 1 ON.
XD_STATE
W, S
Used by some PCS to assign texts to the numerical
values of FIELD_VAL_D.
GRANT_DENY
W
Depending on the PCS in use, the parameter regu
-
lates the access rights between PCS and local oper
-
ator workstations for some control systems.
IO_OPTS
W, S, OOS Option which enables the user to adapt the block
algorithm to the task of the block. This option is:
Invert.
PV_D is calculated as follows: A Boolean negation of
FIELD_Val_D is carried out i.e., PV_D becomes 1 if
FIELD_VAL_D is 0. If FIELD_VAL_D is greater than
0, then PV_D becomes 0.
STATUS_OPTS
W, S, OOS Option that enables the user to adapt the block status
processing to the task of the block. This option is:
Propagate Fault Forward.
If this option is used, the function block does not trig
-
ger an alarm itself if the status of PV_D becomes
"Bad
“
. Instead, the status, including substatus, is
passed on via OUT_D.
CHANNEL
W, S, OOS The number of the logical hardware channel that is
connected to this I/O block. This information defines
the signal converter to be used going to or from the
physical world. See chapter 8.3
PV_FTIME
W, S
Time constant of a single exponential filter for the pri
-
mary variable (PV) in seconds.
FIELD_VAL_D
Raw value of the field device digital input, with a sta
-
tus reflecting the signal converter condition.
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