Campbell CR6 Series, Product Manual

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Switch Closure on U or C Terminal Open Collector on U or C Terminal
6.5.3.2 C terminals
Switch-closure mode is a special case edge-count function that measures dry-contact switch-
closures or open collectors. The operating system filters bounces.
l
CRBasic instruction:
PulseCount()
.
See also Pulse measurement specifications (p. 221).
6.5.4 Edge timing and edge counting
Edge time, period, and counts can be measured on U or C terminals. Feedback control using
pulse-width modulation (PWM) is an example of an edge timing application.
6.5.4.1 Single edge timing
A single edge or state transition can be measured on U or C terminals. Measurements can be
expressed as a time (µs), frequency (Hz) or period (µs).
CRBasic instruction:
TimerInput()
6.5.4.2 Multiple edge counting
Time between edges, time from an edge on the previous terminal, and edges that span the scan
interval can be measured on U or C terminals. Measurements can be expressed as a time (µs),
frequency (Hz) or period (µs).
l
CRBasic instruction:
TimerInput()
6. Measurements 82