Rockwell Automation 1336T Function Block Prog. Manual, Series A/B - Manual (Page 75)

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.
Τ
he
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
×
[In — In (previous)].
PARAMETERS DATA TYPE LINKABLE DEFAULT VALUE RANGE
In Signed Integer Yes 0 ± 32767
Out Signed Integer Yes — ± 32767
Example 1
0 20
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