Rockwell-automation 1336T Function Block Prog. Manual, Series A/B Manuale Utente Pagina 75

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Function Block Library 4–13
1336 FORCE — 5.9 August 1995
DERIV
BLOCK TYPE 7
decimal
7
hexadecimal
Derivative
ID = Exec =
Out
NODE 0
In
NODE 1
t
IN
DEFINITION
The rate of change of input In over a single sample interval. Τhe
sample interval t = .020 seconds. Output Out is clamped at ±32767
and not allowed to over or under flow.
INPUT
In — A signed Integer.
OUTPUT
Out — A signed integer representing the derivative or change in
input in units per second.
FUNCTION
Out = 50 × [InIn (previous)].
PARAMETERS DATA TYPE LINKABLE DEFAULT VALUE RANGE
In Signed Integer Yes 0
±32767
Out Signed Integer Yes ±32767
Example 1
020
t
1
at t
1
Out = 5000
at t
2
Out = 5000
at t
3
Out = 2500
at t
4
Out = 2500
t
2
t
3
t
4
t in mS
IN
300
200
100
40 60 80
500
400
100 120
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