![background image](http://html1.mh-extra.com/html/graco/234129/234129_instructions-manual_2251484082.webp)
Appendix A
82
309738L
Digital Outputs
The four digital outputs are Dispenser Ready, Fault
Present, In Cycle, and Minimum Volume Dispensed.
These outputs perform high-side switching of 24 VDC
and require a 24 VDC current sinking input at the auto-
mation controller. See F
. 33. If the automation control-
ler uses 24 VDC relay coils to receive I/O signals, the
signals should be connected as shown in F
If the automation controller uses optocouplers to receive
digital I/O signals, the inputs must be designed for 24
VDC and the optocoupler emitter cathode must be con-
nected to the PrecisionFlo LT 24 VDC common (pin 6).
See F
If the automation controller inputs are current sourcing
or use a voltage other than 24 VDC, relays with 24 VDC
coils must be used as shown in F
. 33.
F
IG
. 33
F
IG
. 34