Pepperl+Fuchs 1/209 Handbuch Seite 79

Trip Amplifier 1/209
Software Description
Multiple fault
• signal alarm = 1
• channel alarm = 1
• average = previous value
• faulty channel = 123
Three input signals op1, op2, op3 are monitored for equality. If one input leaves the
tolerance band op4 around the average of the signals, the signal alarm op6 will be
activated. If all inputs are different, the channel alarm op7 will be activated.
The faulty channel can be read in op9. Use the DISPLAY command to read the value in
the display in the front panel. The average op8 of those values which are within the
tolerance band can also be displayed. Variables op6, op7, op8, op9 must not be
overwritten during the remaining user program.
4.4.1.14 Trip rate of change alarm
Prior to calling this rate of change alarm use the timer command TIM,op5 to enter the time
since the last call in memory cell op5 (see section "Timers and other operations").
An input or a computed value op1 is monitored for change op3 per time interval op2. The
up-to-date value of op1 will be compared with the old value in op6 (op3 = op1 - op6) when
the time integral op7 > op2. If the change per time interval op3 is above 0 the gradient is
positive. If the change per time interval op3 is less 0 the gradient is negative.
Memory cells op6 to op9 must not be overwritten during the remaining user program.
Call
Formula
GRD,op1,op2,op3,op4,op5,op6,op7,op8,op9
GRD = (gradient) monitor rate of change
op1 = input value to be monitored
op2 = time interval in ms
op3 = max change per time interval
op4 = hysteresis
op5 = time since last call
op6 = input memory (start value)
op7 = time memory (integral of op5 in ms)
op8 = alarm memory
op9 = alarm -1, 0, 1
op9 = 1 for alarms or if op9 was 1 before
op9 = 0 while inside deadband or if op9 was 0 before
op9 = -1 when there is no alarm
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