Pepperl+Fuchs 2/209, Руководство пользователя

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27
DO
CT
-1946C
2018-
07
322
903
Trip Amplifier 2/209
Software description
EN
4.2.15 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.
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.
Example
GRD,E01,K01,K02,K03,X01,X02,X03,X04,X05
Call 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
Formula 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