Rockwell Automation 1771-QDC, D17716.5.93(Passport) PLASTIC MOLDING MODULE - Manual (Page 244)

Tune Your Machine
Chapter 10
10-16
Logical Bridges
In chapter 8, you configured your hold and plastication profiles to stop and
set outputs for no flow or pressure at completion. If your hydraulics and/or
process require NO changes controlled by your PLC-5 processor before
continuing a molding cycle, you may configure the QDC module to
logically bridge the following profile/movement pairs as integrated
machine phases:
hold/pre-decompression (HPC03-B08 = 0)
pre-decompression/plastication (HPC03-B09 = 0)
plastication/post-decompression (PPC03-B08 = 0)
Important: The QDC module always logically bridges the injection, pack
and hold phases as a single integrated machine movement.
Bridging machine phases has benefits such as:
reduced cycle time
smoother QDC control
less chance of hydraulic pressure transients
If your hydraulics and/or process require changes controlled by your
PLC-5 processor before continuing a molding cycle, you may configure
the QDC module to stop at completion of:
hold (HPC03-B08 = 1)
pre-decompression (HPC03-B09 = 1)
plastication (PPC03-B08 = 1)
Then the QDC module sends a fixed signal to each of its four outputs
while awaiting further commands from the PLC-5 processor.
Important: The QDC module always stops and sets outputs at completion
of the post-decompression movement.
EndĆofĆprofile SetĆoutput Values
End-of-profile set-output values have uses including:
adjusting flow through a variable pump between profiles
initializing valves for the next profile or movement
re-aligning solenoid valves by PLC-5 processor before starting the next
profile or movement
When configuring end-of-profile set-output values, remember:
The QDC module ignores these values on all profiles that are logically
bridged to the next profile or movement