Smart HART Discrete Input function block parameters

None

The indication that a block error condition not selected in BAD_MASK (on the function block level) is True (active) or the indication that an error condition (at the module level) not selected in MERROR_MASK is True (Active) or a module status not selected in MSTATUS_MASK is True (Active).

None

The indication that a block error condition selected in BAD_MASK (at the function block level) is True (Active) or the indication that an error condition (at the module level) selected in MERROR_MASK is True (Active) or a module status selected in MSTATUS_MASK is True (Active).

None

The set of active error conditions that triggers a user-defined Bad condition. The user selects a subset of block error (BLOCK_ERR) conditions in the BAD_MASK parameter. When any of these conditions are True, the BAD_ACTIVE parameter becomes True. When any of the BLOCK_ERR conditions that are not included in BAD_MASK are True, ABNORM_ACTIVE becomes True.

None

The summary of active error conditions associated with the block. The possible block errors for the Discrete Input function block are:

• Out of Service - The block is not being processed
• Input Failure - Bad IO_IN
• Simulate Active - SIMULATE_D is enabled, therefore, OUT_D is not real.

None

The result of alarm detection associated with DISC_LIM. If the state of OUT_D matches the value of DISC_LIM, DISC_ACT equals True.

None

The state of the discrete input that causes an alarm. Any number from 0 to 255 can be entered, although only 0 and 1 produce an alarm. State 255 specifies that no alarm indication is to be shown.

None

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

None

Indicates if Inspect is enabled and one or more of the limits for the block have been exceeded. The normal value is 0. This parameter is set to 1 only if both of the following conditions are true:

• The Write to Inspect Alarm context menu item has been selected from Inspect for this block.

• With the Current Hour filter selected, Inspect indicates that an abnormal condition exists for Mode, Control, Input, or Variability. (Note that an abnormal condition exists for Variability only if both the Variability Index and the Standard Deviation have exceeded their defined limits.)

None

Defines the input DST for the I/O channel used for the PV.

None

None

The discrete output value and status.

None

The string from the configured named set that represents the current output of the block. The default named set is $discrete_hart_states.

None

The discrete process variable used in block execution.

None

Enables simulation and allows you to enter an input value and status when SIMULATE_IN_D is not connected.

None

The simulated HART discrete Named Set value used when simulation is enabled.

None

EU of OUT_SCALE or EU of PV_SCALE 

(reports in percent to Inspect)

The standard deviation of PV. For analog control blocks in AUTO, mean is assumed to be the SP.

EU of OUT_SCALE or EU of PV_SCALE

(reports in percent to Inspect)

The estimated capability standard deviation (measurement of short term variation). An estimate of the least standard deviation the process could achieve ideally. 

Percent

Used to calculate a process parameter's standard deviation percent of time out of standard deviation limit

Seconds

The time frame over which STDEV and STDEV_CAP are performed. The default value of zero is good for most processes where the scan rate is no more than approximately 10 times faster than the time to steady state.

If the process is relatively much slower, it is recommended that you enter the approximate time it takes for the process to return to steady state after a change. This ensures that the STDEV and STDEV_CAP calculations accurately consider the actual time constant of the process.

None

A configured HART discrete named set value to which the input is comapred. If the input matches this configured state, then the value of OUT_D is 1, else 0. The default named set is $discrete_hart_states.