Rockwell Automation 1771-QDC, D17716.5.87(Passport) CLAMP AND EJECT MODE - Manual (Page 50)

Configure the QDC Module's
Inputs and Outputs
Chapter 3
3-17
Your QDC module also gives the option of configuring the following
features:
Use this Option: For this Benefit:
Software Travel Limits to guard against damaging the mold assembly or seals
Pressure Alarm Time Delay to warn of excessive pressure without nuisance alarms
Digital Filter to compensate for noise on position inputs
Configure Software Travel Limits
You may want to use the software restrictions to stop the travel of your
clamp or ejector before either reaches its maximum limits (configured
earlier in this chapter).
Figure 4.1
Software Restrictions
Physical Travel Range
Max Position Min Position
d d
Max SWTL Min SWTL
d = deadband
Safe Zone
11019ĆI
During normal machine operation and whenever your cylinder travels
outside the safe zone (outside the specified software travel limits, SWTL),
the QDC module:
sets an alarm status bit
forces its outputs to zero
ignores all profile commands (allowing only set-output and jogs) until
you jog the cylinder back through the deadband into the safe zone at
either end
The deadband guards against sensor noise flickering the SWTL alarms and
requires that the operator jog the cylinder a set distance away from the
software overtravel. We recommend a value of 00.10 inch as a starting
deadband. Your sensor may require a greater deadband.
ATTENTION: The QDC module ignores SWTL alarms when
jogging or when performing a set-output operation.
Optional Configurations