Instruction Manual

Function Block Library 4–44
1336 FORCE — 5.9 August 1995
RATE LIMITER
BLOCK TYPE 19
decimal
13
hexadecimal
Rate Limiter
ID = Exec =
Lim Out
NODE 0
Lim In
NODE 1
NODE 5
Lim @ Lim
NODE 4
Lim Set
NODE 2
Lim Data
NODE 3
Lim Rate
DEFINITION
Limits the rate of change of the input value Lim In by the value of
rate Lim Rate.
INPUTS
Lim In — A signed integer that is rate limited in the positive or
negative direction.
Lim Set — A logic value that preloads the output with the
Lim Data value when Lim Set ≠ 0.
Lim Data — A signed integer that the output will be set to when
Lim Set ≠ 0.
Lim Rate — A word that specifies the Lim Out maximum rate of
change in units/second.
OUTPUTS
Lim @ Lim — A logic flag that indicates Lim Out is limited by
Lim Rate.
Lim Out — A signed integer, rate limited to the Lim Rate value.
FUNCTION
1. If Lim Set is true, Lim Out = Lim Data.
2. If Lim Set is false, ∆ = Lim In – Lim Out.
If ∆ is + and > Lim Rate, Lim @ Lim is true and ∆ = Lim Rate.
If ∆ is + and < Lim Rate, Lim @ Lim is false.
If ∆ is – and <
–Lim Rate, Lim @ Lim is true.
If ∆ is – and >
–Lim Rate, Lim @ Lim is false.
Lim Out = Lim Out + ∆.