Rockwell Automation 1771-QDC, D17716.5.86(Passport) PLASTIC MOLDING MODULE - Manual (Page 237)

Tune Your Machine
Chapter 10
10-29
Logical Bridges
In chapter 8, you configured your QDC module to logically bridge all your
clamp profiles. This forced the QDC module to start each successive
profile at completion of the previous one. If your hydraulics and/or
process require NO changes between profiles controlling clamp motion,
you may configure the QDC module to logically bridge the following
clamp open and close profiles as integrated machine phases:
first clamp close to second clamp close (CPC03-B08 = 0)
second clamp close to third clamp close (CPC03-B09 = 0)
third clamp close to low pressure close (CPC03-B10 = 0)
first clamp open to second clamp open (OPC03-B08 = 0)
second clamp open to third clamp open (OPC03-B09 = 0)
third clamp open to open slow (OPC03-B10 = 0)
Bridging machine phases has benefits such as:
reduced cycle time
smoother control
less chance of hydraulic pressure transients
EndĆofĆprofile SetĆoutput Values
If required by your application, you may configure the QDC module to
stop at the completion of any profile 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
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 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)
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.
Logical Bridges, and
EndĆofĆprofile
SetĆoutput Values