Overview Change per time

This function block calculates the change of a value per time. If the difference exceeds an adjustable setpoint, an alarm output is set. This block can, for example, be used to check whether the temperature falls within a certain time (window/door open) or rises (fire).


Inputs

RS
 Reset
Ix
 Actual value
 Current actual value
Gx
 Limit value Deviation limit; if the difference exceeds this value, the alarm output is set.
Zx
 Time Time in seconds within which the deviation is checked.

Outputs
AL
 Alarm
 Alarm.
AC Alarm count Number of deviations. If several inputs have been set, the number of exceedances is output here.

Parameters
Number of values
 Number of values to be monitored.
Alarm type
  • One exceeded: The alarm output is set to 1 as soon as one of the values has been exceeded.
  • All exceeded: The alarm output is set to 1 when all values have been exceeded.
Deviation type
  • Plus/Minus: Alarm if the actual value rises or falls.
  • Plus only: Alarm if the actual value falls.
  • Minus only: Alarm if the actual value rises.



See also common parameters of all function blocks.