Echelon I/O Model Reference for Smart Transceivers and Neu Manual de usuario descargar pdf (Pagina 39)

I/O Model Reference 29

returned by subsequent calls to io_in( ) until a new value is latched based on the

timing in the hardware.

The period input and ontime input models latch a new value on the falling edge

of the input signal (or if the invert keyword is used, these models latch the new

value on the rising edge of the input signal). The pulsecount input model latches

a new value every 0.8388608 seconds. See the

Neuron C Programmer’s Guide

for

more information about timer frequencies and timer accuracy.

Generally, new values written to timer/counter output objects are acted upon at

the end of the current output signal period. Exceptions to this rule are oneshot

output and I/O models that have been disabled (that is, have a zero control

value), all of which take effect upon return from the io_out( ) function.

Output Models

The following timer/counter output models reflect a new output value at the end

of the current output signal period:

• edgedivide output

• frequency output

• pulsewidth output

• stretchedtriac output

• triac output

• triggeredcount output

The following timer/counter output models reflect a new output value upon

return from the io_out( ) function:

• oneshot output

• pulsecount output

All timer/counter output models respond to a zero output value upon return from

the io_out( ) function.

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Echelon I/O Model Reference for Smart Transceivers and Neu Manual de usuario Pagina 39