F288_DBAND

The function compares the signed input value at input s3 with a deadband whose lower limit is specified at input s1 and whose upper limit is specified at s2. The result of the function is returned at output d as follows:

Parameters

Input

s1 (DWORD, DINT, UDINT, DATE, TOD, DT) (signed)

the area where the lower limit is stored or the lower limit data

s2 (DWORD, DINT, UDINT, DATE, TOD, DT) (signed)

the area where the upper limit is stored or the upper limit data

s3 (DWORD, DINT, UDINT, DATE, TOD, DT) (signed)

the area where the input value is stored or the input value data

Output

d (DWORD, DINT, UDINT, DATE, TOD, DT) (signed)

the area where the output value data is stored

Remarks

• Instead of using this F instruction, we recommend using the corresponding FP7 instruction: FP_BAND

• If the input value at input s3 < s1, the lower limit at input s1 is subtracted from the input value at s3, and the result is stored as the output value at d.

• If the input value at input s3 > s2, the upper limit at input s2 is subtracted from the input value at s3, and the result is stored as the output value at d.

• If the input value at s2 ³ s3 ³ s1, 0 is returned as the output value at d.

  

  1.  (1) output value d
  2.  (2) input value s3_In
  3.  (3) upper limit of deadband s2_Max
  4.  (4) in this range, zero is output
  5.  (5) lower limit of deadband s1_Min

Error flags

sys_bIsOperationErrorHold (turns to TRUE and remains TRUE)

if the value at s1 > s2.

sys_bIsOperationErrorNonHold (turns to TRUE for one scan)

if the value at s1 > s2.

sys_bIsEqual (turns to TRUE and remains TRUE)

if the input value at s3 is 0.