Bay Technical Associates V79 PDI-1 - Manual (Page 6)

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1.1 V79 PDI-1 MODULE
The main features of the V79 PDI-1 module are sixteen microprocessor-controlled
input channels that can be connected with individual ground returns, or a common
single-point ground. The input channels provide a flexible, reliable method to detect
and report the change-in-state of a circuit. The change can be from infinite
resistance (open) to continuity (closed), and vice versa. For example, the change-
in-state could be for a set of form C (dry) relays or switch contacts. Any change
in the status of individual or multiple inputs may be observed, recorded, reported,
analyzed, and acted upon. The level and type of actions desired or required are
easily selectable through the PDI-1's configuration menu.
Individual or multiple inputs may be polled for present status or configured to
automatically provide an alert message when a change-in-state is observed.
Momentary changes in an input's condition can be monitored and "latched" into
memory for post-action analysis. The reporting of false, or transient events can
be prevented by selection of programmable "debounce times". Input connections
to the PDI-1 are made through a standard DC-37F connector.
1.2 V80 PDI-2 MODULE
The primary feature of the PDI-2 series is sixteen microprocessor controlled,
optically isolated voltage inputs. The PDI-2A is designed for an input "on" voltage
range of 5 to 24 AC or DC volts and the PDI-2B for 100 to 130 AC or DC volts.
All inputs have 500V AC or DC electrical isolation from ground. Inputs are not
polarity sensitive. Therefore, paired signal inputs can be made using the "return"
or "input" terminal as the positive connection.
A mixture of AC and DC inputs can be selected by individual channels. For
example, Channel 1 could be a DC input, Channels 2 and 3 AC inputs, Channel 4 a
DC input, etc.. Dip switches are provided for selection of low-pass filtering
during AC input operation.