Rockwell Automation 1771-QDC, D17716.5.93(Passport) PLASTIC MOLDING MODULE - Manual (Page 58)

Configure the QDC Module's I/O
Chapter 3
3-14
You have the option of configuring the following QDC module features:
Use this Option: For this Benefit:
Software Travel Limits to guard against damaging the nozzle, mold, or ejectors
Pressure Alarm Time Delay to warn of excessive pressure without nuisance alarms
Digital Filter to compensate for electrical noise on position inputs
Configure Software Travel Limits
You may want to use software restrictions to stop the travel of your ram
(screw), clamp, and/or ejector before either reaches its maximum limits
(configured earlier in this chapter).
Figure 3.1
Software Restrictions
Physical Travel Range
Max Position Min Position
d d
Max SWTL Min SWTL
d = deadband
Safe Zone
Important: With the orientation shown, clamp movement is from left to
right. By convention, ram (screw) and ejector movement is reversed.
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 (except 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 limit. We recommend a value of 00.10 inch as a
starting deadband. Your sensor may require a greater deadband.
ATTENTION: When jogging or when performing a set-output
operation, the QDC module ignores SWTLs. In these modes, it
will not zero its outputs so equipment damage could occur.
Select Optional
Configurations