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Appendix A
309738L
81
Appendix A
Using the PrecisionFlo LT I/O
The PrecisionFlo LT uses several I/O signals to communicate with plant automation controllers. There are four digital
inputs, four digital outputs, one analog input, and one analog output. All of these signals are routed to the I/O connec-
tor on the top of the controller.
Other pins on the I/O connector include 24 VDC power, 24 VDC common, analog common, and a signal which is 24
VDC power only when the controller E-Stop switch is not latched in. None of the signals are isolated; all are refer-
enced to the ground plane of the control board. The following paragraphs describe typical connection methods for the
automation controller signals.
Digital Inputs
The two digital inputs are Dispense Gun and Job Com-
plete. These inputs require a 24 VDC current sourcing
output from the automation controller. See F
If the automation controller uses relay contacts to acti-
vate I/O signals, the 24 VDC available at the Precision-
Flo LT I/O connector (pin 5) should be used to drive the
inputs. If the automation controller uses high-side
switching of 24 VDC, the automation outputs can be
directly connected to the inputs as long as the 24 VDC
common (pin 6) of the PrecisionFlo LT is able to be con-
nected to the automation controller common. If the auto-
mation controller outputs are low-side switching (open
collector) or a voltage other than 24 VDC, relays must
be used as shown in F
F
IG
. 32
Pin 1 or 2
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