Rockwell Automation 1771-QDC PLASTIC MOLD.MODULE - Manual (Page 18)

Preface P–4
Publication 1771-6.5.88 – May 1997
Reverse Acting
Valve An analog control valve that delivers increasing velocity or
pressure with decreasing signal input
Selected Valve In multi-valve systems, depending on the configured profile, the
QDC module controls one valve and presets the setting of the
remaining valves to produce molding-machine profiles. We call
the valve being controlled by the QDC module’s algorithms the
selected valve. Multiple axes of control, such as the clamp and
ejector cylinders, may require additional control valves.
Status Block Blocks used by the QDC module to report information to the
PLC-5 about the QDC module’s current operating status
SWTL Software travel limit
Unselected Valves In multi-valve systems, depending on the configured profile, the
QDC module controls one valve and presets the remaining
valves to produce molding-machine profiles. We call the valves
that are preset with an open loop percentage setpoint the
unselected valves.
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