Process Control Instructions
42 Rockwell Automation Publication 1756-RM006K-EN-P - November 2018
Structured Text
Operand Type Format Description
D2SD tag DISCRETE_2STATE Structure D2SD structure
See Structured Text Syntax for more information on the syntax of expressions
within structured text.
Function Block
Operand Type Format Description
D2SD tag DISCRETE_2STATE Structure D2SD structure
DISCRETE_2STATE Structure
Input Parameter Data Type Description
EnableIn BOOL Enable input. If false, the instruction does not execute and
outputs are not updated.
Default is true.
ProgCommand BOOL Used to determine CommandStatus when the device is in
Program control. When true, the device is commanded to
the 1 state; when false, the device is commanded to the 0
state.
Default is false.
Oper0Req BOOL Operator state 0 request. Set by the operator interface to
place the device in the 0 state when the device is in
Operator control.
Default is false.
Oper1Req BOOL Operator state 1 request. Set by the operator interface to
place the device in the 1 state when the device is in
Operator control.
Default is false.
State0Perm BOOL State 0 permissive. Unless in Hand or Override mode, this
input must be set for the device to enter the 0 state. This
input has no effect for a device already in the 0 state.
Default is true.
State1Perm BOOL State 1 permissive. Unless in the Hand or Override mode,
this input must be set for the device to enter the 1 state.
This input has no effect for a device already in the 1 state.
Default is true.
FB0 BOOL The first feedback input available to the D2SD instruction.
Default is false.
FB1 BOOL The second feedback input available to the D2SD
instruction.
Default is false.
HandFB BOOL Hand feedback input. This input is from a field
hand/off/auto station and it shows the requested state of
the field device. When true, the field device is being
requested to enter the 1 state; when false, the field device
is being requested to enter the 0 state.
Default is false.
To Next Page
Loading...
Need help?
General
