Owner`s manual

M SERIES DAC
BASE UNIT AND MODULE OPERATION
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NOTE: Duration measurements are not de-bounced. If the input circuit
cycles between active and inactive before settling, only the settled value is
reported. Therefore, if a PDI module is connected to a relay or switch that
has "dirty" contacts, the total measurement will be less than the actual
activation duration of the circuit by the amount of time spent settling.
The event counter reflects the total number of events that have occurred since the
event counter was last cleared using the CC or RO command. You may read the
current event counter value by sending the RC or RO command. The event counter
will trigger on the rising edge of an event when LO to HI Latch Polarity is selected or
on the falling edge of an event when HI to LO Latch Polarity is selected. Examples
of using the event counter would include counting items moving on a conveyor belt
and process control where a pre-determined number of events must take place before
a defined action may take place.
NOTE: An event must have a duration greater than one millisecond plus the
current debounce delay time to increment the event counter.
EVENT SAMPLE PRESENTATION
Event Sample presentation varies slightly in format depending on module
configuration. Entries such as, time tag, data format, number of active channels, etc.
all change how event samples appear to a host-controller. However, all event samples
are presented in the same basic order of fields as follows:
UU:MM,CC 1 or 0 MM/DD/YY HH:MM:SS
where, UU is the M Series Unit Number
MM is the PDI Module Number
CC is the PDI Channel Number
1 channel status is "closed" (V79 PDI-1) or has voltage applied
(V80 PDI-2)
0 channel status is "open" (V80 PDI-2) or has no voltage applied
(V80 PDI-2)
MM is the month (if Time Tag enabled)
DD is the day (if Time Tag enabled)
YY is the year (if Time Tag enabled)
HH is the hour (if Time Tag enabled)
MM is the minute (if Time Tag enabled)
SS is the second (if Time Tag enabled)
The following example shows event samples received using immediate or schedule
reporting where the PDI is installed in Unit 1 Module 15 with Time Tagging enabled: