Specifications

Chapter 3 – Input/Output Interfaces
84 PL 3120/PL 3150/PL 3170 Power Line Smart Transceiver Data Boo
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Edgelog Input
The edgelog input object can record a stream of input pulses measuring the consecutive low and high periods at the
input and storing them in user-defined storage (see Figure 3.42). The values stored represent the units of clock period
between rising and falling input signal edges.
The measurement series starts on the first rising (positive) edge, unless the invert keyword is used in the I/O object
declaration. The measurement process stops whenever an overflow condition is sensed on either timer/counter.
The resolution and range of the timer/counter period options are shown in Table 3.8 in the Notes section at the end of
this chapter. This object is useful for analyzing an arbitrarily-spaced stream of input edges (or pulses), such as the output
of a UPC bar-code reader or infrared receiver.