Fieldbus Valve Coupler FD0-VC-Ex4.FF
Function blocks DO and DI
50
Subject to reasonable modifications due to technical advances.
Copyright Fuchs, Printed in Germany
Fuchs Group • Tel.: G49 621 776-0 • USA +1 330 4253555 • Sin65 67799091 • Internet http://www.pepperl-fuchs.com
P
a
rt
N
o
.:
1
082
27
, D
a
te
o
f i
ssue
27
.0
3.2
006
B
Function blocks DO and DI
Function block DO
The column "Char." shows which characteristics or conditions are applicable to this parameter. The follow-
ing is applicable here:
•
OOS (Out of Service)
The parameter can be written only if the target mode of the block is "Out of Service".
•
S (Static)
During each writing process to such an identified parameter the parameter ST_REV is increased by one.
•
W (Writeable)
The parameter can be modified by the user.
As all parameters can be read this is not marked especially.
Parameter
Char.
Description
ST_REV
During each writing process to a parameter marked by "S" the parameter
ST_REV is increased by one.
TAG_DESC
W
S
Via this parameter the valve interface can be assigned a tag (measuring point
designation) within the plant and/or process.
STRATEGY
W
S
The strategy field can be used to identify comprising blocks. These data are
not controlled or used by the block.
ALERT_KEY
W
S
Identification number of the plant unit. This information can be used by the
control computer, 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", "Cas", "RCas", "Man" or "Out
of Service".
BLOCK_ERR
Displays diagnosis messages of the block.
PV_D
The current valve position which is fed back by the transducer block. This
parameter is taken over from READBACK_D and inverted with the inversion
feature activated.
SP_D
Current reference value of block.
OUT_D
This value is calculated by the function block and is used as specified refer-
ence value for the transducer block.
SIMULATE_D
W
Simulation can be activated/deactivated via this structure. With the simulation
ON, READBACK_D is specified via this parameter. Simulation can only be
activated with the associated switch 1 (section 5.4.2) ON.
PV_STATE
W
S
Is used by some control systems to assign text designations to the numeral
values of PV_D.
XD_STATE
W
S
Is used by some control systems to assign text designations to the numeral
values of READBACK_D.
GRANT_DENY
W
Regulates the access rights between control system and local operator's sta-
tions for some control systems.
