You select the manner of processing the pulse value by configuring the I/O selection and filtering parameters.
I/O Selection
When you configure the Pulse Input function block, you select the I/O channel associated with an pulse measurement by configuring the Device Signal Tag (DST) of the IO_IN parameter. You select the Device Tag and the parameter the PIN block accesses on that channel.
Simulation
To support testing, you can enable simulation. This allows the measurement value and status to be supplied manually or from another block.
During configuration, decide whether you want to enter the simulated value/status manually during operation or use a value/status from another block for the simulated value/status.
When the value is entered manually:
The operator first enables simulation by selecting the SIMULATE parameter and setting the Simulate Enabled check box in the Simulate Enabled/Disabled field. In online operation, the operator can enter a simulated status value in the Simulate Status field.
If SIMULATE_IN is not connected (status = Bad: NotConnected), the SIMULATE value is used.
If SIMULATE_IN has any status except Bad: NotConnected, the SIMULATE_IN value is used. In this case, the SIMULATE_IN value always overrides the SIMULATE value.
Use the SIMULATE parameter to enter values manually and make sure SIMULATE_IN is not connected. If SIMULATE_IN is connected or a value is entered manually into SIMULATE_IN, the SIMULATE_IN value overrides the SIMULATE value.
When the value/status from another block is used:
During configuration, connect SIMULATE_IN to the desired block output or parameter. Do not enter a value in the Simulate Value field of the SIMULATE_IN input; the block uses the connected value automatically.
During operation, the operator enables simulation by selecting the SIMULATE parameter and setting the Simulate Enabled check box in the Simulate Enabled/Disabled field.
Do not enter a value for the SIMULATE_IN parameter. If you do and the status of SIMULATE_IN is not Bad: NotConnected, the manually entered value for SIMULATE_IN overrides any value you enter in SIMULATE.
Filtering
You apply filtering to the converted value (PV) by specifying the filter time constant (in seconds) in the PV_FTIME parameter. When you specify a value of zero, no filtering is applied.
Block Errors
Simulate active — Simulation is enabled and the block is using a simulated value in its execution.
Input failure/process variable has Bad status — The source of the block's process variable is bad. Indicates a hardware failure, a non-existent Device Signal Tag (DST), or a Bad status on the SIMULATE parameter.
Out of Service — The block is in Out of Service (OOS) mode.
Calculation of OUT
OUT equals PV and status when in Auto mode. The operator sets OUT when in Manual mode.
The DeltaV Multifunction card calculates the frequency of pulses in counts per second. Therefore, the block does not use scan rate in the calculation of OUT.
Calculation of PV
The Pulse Input function block's PV is calculated by frequency times pulse value times time units factor.
The DeltaV Multifunction card calculates the frequency of pulses in counts per second. Therefore, the block does not use scan rate in the calculation of PV.
Calculation of FIELD_VAL
The Pulse Input function block's FIELD_VAL is calculated as the percent value of PV within the range defined by OUT_SCALE.