SIS function blocks > SIS I/O Blocks > Logic Solver Discrete Input function block

Logic Solver Discrete Input function block parameters

The following table lists the system parameters for the function block:

Table: LSDI Function Block System Parameters

Parameter

(Data Type)

Default Value

(Units)

Characteristics

Description

BLOCK_ERR

(Option bitstring)

None

NVM:

Preserved on Download

Bitstring parameter that indicates the following  information:

  • Input Failure/Bad PV

  • Simulate Active

FIELD_VAL_D

(Discrete with status)

0

NVM:

Preserved on Download

The value and status of the discrete input from a field device.

IO_IN

(I/O Reference)

None

None

Defines the input DST for the input used for the PV.

IO_OPTS

None

Access:

Configurable, Tuning

NVM:

Restored on Restart

The supported I/O option for the Discrete Input function block is Invert.

OUT_D

(Discrete with status)

0

NVM:

Preserved on Download

The discrete output value and status. The value and status are the same as for PV_D.

PV_D

(Discrete with status)

0

NVM:

Preserved on Download

The discrete process variable after filtering and inversion, if any, of FIELD_VAL_D.

PV_FTIME

(Floating point)

0

(Seconds)

Access:

Configurable, Tuning

NVM:

Restored on Restart

The time that FIELD_VAL_D must be on or off before PV_D changes.

SIMULATE_D

(Simulate)

Disabled, 0, GoodNonCascade

Access:

Configurable, Tuning

When SIMULATE is Enabled you can specify a simulated input value and status.

You can enable SIMULATE only when the module containing this block is downloaded to a ProfessionalPLUS workstation (a simulated Logic Solver).