User`s guide

PCI-2513 User's Guide Functional Details

You can program control outputs programmed on each setpoint, and use the detection for channel 4 to update

the FIRSTPORTC digital output port with one value (70 h in the example) when the analog input voltage is

within the shaded region and a different value when the analog input voltage is outside the shaded region (30 h

in the example).

Detection on an analog input, timer output updates

Update Mode: Update on True and False

Criteria Used: Inside window

The figure below shows how a setpoint can be used to update a timer output. Channel 3 is an analog input

channel. A setpoint is applied using update on True and False, with a criteria of inside-the-window, where the

signal value is inside the window when simultaneously less than Limit A but greater than Limit B.

Whenever the channel 3 analog input voltage is inside the setpoint window (condition True), Timer0 is updated

with one value; and whenever the channel 3 analog input voltage is outside the setpoint window (condition

False) timer0 will be updated with a second output value.

Figure 19. Timer output update on True and False

Using the hysteresis function

Update mode: N/A, the hysteresis option has a forced update built into the function

Criteria used: Window criteria for above and below the set limits

The figure below shows analog input Channel 3 with a setpoint which defines two 16-bit limits, Limit A (High)

and Limit B (Low). These are being applied in the hysteresis mode and FIRSTPORTC is updated accordingly.

In this example, Channel 3's analog input voltage is being used to update FIRSTPORTC as follows:

 When outside the window, low (below limit B) FIRSTPORTC is updated with 30 h. This update remains in

effect until the analog input voltage goes above Limit A.

 When outside the window, high (above limit A), FIRSTPORTC is updated with 30 h. This update remains

in effect until the analog input signal falls below limit B. At that time we are again outside the limit "low"

and the update process repeats itself.

Hysteresis mode can also be done with a timer output, instead of a FIRSTPORTC digital output port.