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ABOUT THE PAM WITH SAM SYSTEM
Encoder
CONVERTER
SAMPLER
SYNCHRO.
AXIS
M
Figure 8 Synchronizer Provides the Capability to Start, Stop and Resynchronize a Slave axis
COMPARATOR
Comparator and Multi–Comparator
SYNCHRONIZE
OPERATION OF
INPUTS AND
OUTPUTS TO MOTION
A Comparator monitors the flow of pipe data and causes a specified action when
the flow of values at it’s input crosses a specified reference value. A Comparator is
often used for synchronizing the operation of an actuator to the position of a
product or axis in a machine cycle.
A Multi–Comparator is similar to a Comparator, but provides a more sophisticated
triggering algorithm which may include a time delay, slope parameters and multiple
trigger points.
Figure 9 illustrates an application of the Comparator. In this example an output
valve, controlled by a Comparator is added to the filling mechanism from Figure 7.
When cam position crosses the value “Trigger 1”, the Comparator initiates the
“Open Routine” which, in turn, opens the output valve. Next, the Comparator is set
to the value “Trigger 2”. When cam position crosses the “Trigger 2” value, the
Comparator initiates the “Close Routine” and the valve is closed. The Comparator
is again set to the value of “Trigger 1” and the cycle restarts. A user output resident
in the SAM Drive operates the valve.
max
AXIS
Valve
Task
M
CONVERTER
COMPARATOR
Trigger2
Trigger1
CAM
Close
Routine
I/O
Output
Valve
Open
Routine
max
Trigger1
Cam Output
TMP
GENERATOR
min
Trigger2
min
Cam Input
Figure 9 Comparator used to Control a Valve on a Filler Mechanism
About PAM with SAM
DOC: 9032011852 Rev. April 8, 1999
Page: 21