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Theory of Operation
Volume Reporting
The volume dispensed during the last job is available
on the data bus at the end of a cycle. This information
is reported in two groups of 5 bits which combine to
form a 10-bit binary code that measures the volume
dispensed in the previous cycle in cubic centimeters
(Fig. 37).
To determine the amount of material dispensed, con-
vert the 10 bits from binary to decimal. The accuracy
depends on the accuracy of the flow meter.
The last volume dispensed is overwritten when the
MEASURE VOLUME line is changed from LOW to
HIGH by the robot.
Fig. 37
B
A
C
E
F
D
Least Significant Data
Most Significant Data
Measure Volume
Volume Request
Volume Valid
Volume Data
C
D
Table 10 — Volume Data Timing Limits
Minimum Time
(msec)
Maximum Time
(msec)
A
MEASURE VOLUME drops to VOLUME REQUEST rises
1
–
B
MEASURE VOLUME stays LOW
500
–
C
VOLUME REQUEST rises to Volume VALID rises
–
130
D
Data bus valid to Volume VALID rises
–1
1
E
VOLUME REQUEST drops to VOLUME VALID drops
–
130
F
VOLUME VALID drops to VOLUME REQUEST rises
0
–
Continued on the next page.
