Appendix B - I/O; Using The Pgm I/O - Graco PGM Instructions - Parts Manual

Appendix B - I/O

Appendix B - I/O

Using the PGM I/O

The gear meter uses several I/O signals to communicate with plant automation controllers. There are two digital
inputs, three digital outputs, and one analog input. All of these signals are routed to the I/O connector 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 latched in. None of the signals are isolated; all are referenced
to the ground plane of the control box. The following paragraphs describe typical connection methods for the auto-
mation controller signals.
Digital Inputs
The two digital inputs are Dispense Start 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 gear meter
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 con-
nected to the inputs as long as the 24 VDC common
(pin 6) of the gear meter is able to be connected to the
automation controller common. If the automation con-
troller outputs are low-side switching (open collector) or
a voltage other than 24 VDC, relays must be used as
shown in F . 41.
IG
Automation
Relay
Contact
Input Circuit
F . 41
IG
98
. 41.
IG
PGM Control
5 24VDC
Input
Pin 1 or 2
3A5185B