Rockwell Automation 1771-QDC, D17716.5.93(Passport) PLASTIC MOLDING MODULE - Manual (Page 258)

Tune Your Machine
Chapter 10
10-30
Bridging machine phases has benefits such as:
reduced cycle time
smoother control
less chance of hydraulic pressure transients
EndĆofĆprofile (Ćstroke) SetĆoutput Values
If required by your application, you may configure the QDC module to
stop at the completion of any profile (or stoke) and provide a constant
signal to each of its four outputs while awaiting further commands from
your PLC-5 processor. Disabling logical bridges and configuring end-of-
profile (-stroke) set-output values let you do this. Recall in chapter 9 that
we used set-output values at the end of the low pressure close profile to
achieve tonnage on hydraulic clamps and hold pressure on toggle clamps.
If your hydraulics and/or process require changes controlled by your
PLC-5 processor between profiles controlling clamp or ejector motion, you
may configure the QDC module to stop at the completion of:
first clamp close (CPC03-B08 = 1)
second clamp close (CPC03-B09 = 1)
third clamp close (CPC03-B10 = 1)
first clamp open (OPC03-B08 = 1)
second clamp open (OPC03-B09 = 1)
third clamp open (OPC03-B10 = 1)
end-of-stroke position (EPC03-B12 = 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 low pressure close and open slow profiles.
End-of-profile set-output values have uses including:
setting cores between clamp close profiles
pulling cores between clamp open profiles
third plate drop-off and pick-up
building tonnage/holding pressure on the clamp prior to injection
adjusting flow with a variable pump after clamping or 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
decreasing ejector hydraulic circuit volume after the clamp is fully open
resting your hydraulics before switching directional valves by PLC
processor and retracting the ejector