Allen-Bradley LOGIX 5000 Reference Manual page 42

Chapter 1 Process Control Instructions
42
Structured Text
Operand Type
D2SD tag DISCRETE_2STATE
See Structured Text Syntax for more information on the syntax of expressions
within structured text.
Function Block
Operand Type
D2SD tag DISCRETE_2STATE
DISCRETE_2STATE Structure
Input Parameter Data Type
EnableIn BOOL
ProgCommand BOOL
Oper0Req BOOL
Oper1Req BOOL
State0Perm BOOL
State1Perm BOOL
FB0 BOOL
FB1 BOOL
HandFB BOOL
Rockwell Automation Publication 1756-RM006K-EN-P - November 2018
Format Description
Structure D2SD structure
Format Description
Structure D2SD structure
Description
Enable input. If false, the instruction does not execute and
outputs are not updated.
Default is true.
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.
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.
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.
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.
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.
The first feedback input available to the D2SD instruction.
Default is false.
The second feedback input available to the D2SD
instruction.
Default is false.
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.