Rockwell Automation 1771-QDC, D17716.5.86(Passport) PLASTIC MOLDING MODULE - Manual (Page 142)

Load Initial Profile Values
Chapter 8
8-21
OpenĆloop or ClosedĆloop Control
(HPC04)
- BITS 03 and 01 determine whether you use open- or closed-loop
control of pack and hold profiles. In open loop, a valve position
moves the cylinder without sensor feedback . In closed loop, sensor
feedback controls the valve regulating pressure.
0 = Closed loop
1 = Open loop
We set these bits to 1 for open-loop control on Worksheet 8-C.
The valve spanning procedures in chapter 9 require these initial bit
settings. Where required, we help you select correct final bit settings for
your application in chapter 10. For additional information, refer to the
Plastic Molding Module Reference Manual (publication 1771-6.5.88).
Time Setpoints
(for pack profile: HPC11, 14, 17, 20, and 23)
(for hold profile: HPC28, 31, 34, 37, and 40)
Use these words when configuring pack or hold profiles. You enter time in
seconds. Each setpoint controls the time of its corresponding segment.
You must use the same number of time setpoints as pressure setpoints. The
procedures in chapter 9 require all ten.
We entered a value of 1 second (100) on Worksheet 8-C for each of the 10
time setpoints listed above.
The valve spanning procedures in chapter 9 require these initial values.
For additional information, refer to the Plastic Molding Module Reference
Manual (publication 1771-6.5.88).
Profile Offsets
(for Pack profile: HPC25)
(for Hold profile: HPC42)
Profile offset lets you shift the amplitude of the entire pack or hold profile
up or down, if necessary. You enter these setpoints in PSI or Bar.
We entered zeros for no pressure offsets on Worksheet 8-C.
Determine Word Values
for Worksheet 8ĆC