310531 67
PrecisionFlo Control Interface Signals
Digital Output
Signals sent to an external controller from the PrecisionFlo module.
Signal Name
Connector /
Pin
Signal Description
Fault Strobe
I/O–D16
Signal is HIGH when the PrecisionFlo module has detected a fault, and
valid data representing the current fault condition is available to be read
from the data bus. If the fault is an Alarm, the PrecisionFlo module will
stop dispensing and will require the operator to clear the Alarm using the
control pendant. If the fault is a Warning, dispensing will not be inter-
rupted.
Dispenser Ready
I/O–D6
Signal is HIGH when no faults exist and the PrecisionFlo module is in
AUTO mode and ready to dispense. This signal should be continuously
monitored, and should be HIGH before a dispense cycle is initiated.
Data Bus 0
Data Bus 1
Data Bus 2
Data Bus 3
Data Bus 4
I/O–A2
I/O–D14
I/O–D9
I/O–D15
I/O–A5
These output bits are used to signal volume and fault data. (Refer to the
timing diagrams and descriptions on pages 58 through 59.)
Volume Valid
I/O–D10
Signal is made HIGH to indicate that the data bus is presenting valid
volume information. (Refer to figure 37 on page 59.)
Analog Input
Signals sent from an external controller to the PrecisionFlo module.
Signal Name
Connector / Pin
Signal Description
Flow Command
+ SIG = WIRE 2351 / RAR–1
– SIG = WIRE 2371 / RAR–2
Provide an analog voltage to signal the desired material flow
rate. This signal can be scaled through the control pendant
and can represent, dependent on the calibration mode, either
outlet pressure or flow rate. During calibration, the Precision-
Flo module automatically assumes the signal represents a
desired pressure if a flow meter is not present.
