Hitachi WJ Series User Manual page 270

Chapter 9
■ Window comparator operation example 1: When [b070]/[b071] is set to "no (Disable)"
 If the "[Ai1] operation set level at disconnection or compare event [b070]" or "[Ai2] operation set
level at disconnection or compare event [b071]" is set to "No (Disabled)", the [WCAi1] or
[WCAi2] ([Ai1Dc] or [Ai2Dc]) signal is output when the analog input value is within the window
comparator upper and lower limit range.
Ai1 or Ai2 input
Max(100%)
Hysteresis width
[b062]/[b065]
Min(Ai1/Ai2:0%)
[WCAi1]/[WCAi2]
([Ai1Dc]/[Ai2Dc])
■ Window comparator operation example 2: Example of disconnection detection
 If the lower limit, upper limit, and operation set level at disconnection or compare event are set
as shown in the figure below, the analog disconnection detection signal turns on when the
analog input reaches the minimum value due to disconnection, and the operation set level at
disconnection or compare event will be used as the analog input value instead of the actual
analog input value.
Ai1 or Ai2 input
Max(100%)
Hysteresis width
[b062]/[b065]
Min(Ai1/Ai2:0%)
[WCAi1]/[WCAi2]
([Ai1Dc]/[Ai2Dc])
■ Window comparator operation example 3: Example of short-circuit detection
 If the lower limit, upper limit, and operation set level at disconnection or compare event are set
as shown in the figure below, the analog disconnection detection signal turns on when the
analog input reaches the maximum value due to a short circuit, and the operation set level at
disconnection or compare event will be used as the analog input value instead of the actual
analog input value.
Ai1 or Ai2 input
Max(100%)
Hysteresis width
[b062]/[b065]
Min(Ai1/Ai2:0%)
[WCAi1]/[WCAi2]
([Ai1Dc]/[Ai2Dc])
Analog input value
ON
ON
Analog input value
Disconnection
Analog input value
9-11-11
Window comparator upper limit
[b060] or [b063]
Window comparator lower limit
[b061] or [b064]
ON
Operation set level at
disconnection or compare event
[b070]/[b071]
Window comparator upper
limit [b060] or [b063]
ON
Short-circuit ↓
Window comparator upper
limit [b060] or [b063]
Window comparator lower
limit [b061] or [b064]
Operation set level at
disconnection or compare event
[b070]/[b071]
ON
Inverter Functions
Analog input value used
Window comparator lower
limit [b061] or [b064]
Analog input value used