Siemens SIMATIC 505 - Decompression;Suck-Back Logic Diagram

Sample RLL and Logic Diagrams
B-5
B.4 Decompression/Suck-Back Logic Diagram
Yes
No
Ram
position
Distance
(V)
(V)
(V)
Max
position
Suck-back
velocity
Suck-back
pressure
(V)
(V)
Decomp
required
Yes
Next
RLL
logic
Plasticate
complete
Suck-
back
complete
Add suck-back
distance to
current ram
position
Is max
position
exceeded?
Load velocity
and pressure
values to hold
outputs
Is ram current
position ≥ suck-back
position?
Load bias to
velocity and
pressure
hold outputs
Use
max
position
No
(D)
No
Yes
Pressure
Velocity
bias
(V)
(V)
bias
Figur e B-4 Decompression/Suck-Back Logic Diagram for RLL Implementation