Echelon I/O Model Reference for Smart Transceivers and Neu Uživatelský manuál stáhnout pdf (Strana 137)

I/O Model Reference 127

Timer/Counter 1

Timer/Counter 2

IO10

IO9

IO8

IO0

IO1

IO2

IO3

IO4

IO5

IO6

IO7

mux

Control Output

From

Comparator

IO11

OUTPUT

(IO0 OR IO1)

START OF

io_in_request()

END OF

io_in()

LATCHED COUNT

AVAILABLE TO

APPLICATION

START

OF io_in()

TIME

INPUT

(IO4 TO IO7)

ANALOG SWITCH

CONTROL

COMPARATOR

OUTPUT

INTEGRATOR

OUTPUT

thresh

reqo

fin

Figure 48. Dualslope Input and Timing

Table 49. Dualslope Input Latency Values for Series 3100 Devices

Symbol Description Minimum Typical Maximum

reqo

io_in_request() to output toggle — 75.6 μs —

fin

Input function call and return — 82.8 μs —

Programming Considerations

For dualslope input, the data type of the control_value for the io_in_request( )

function is an unsigned long. The return value of the io_in( ) function is an

unsigned long. Both the return value for io_in( ) and the value stored at

input_value is a number biased negatively by the control_value used for the

io_in_request( ) function, and can be corrected by adding the control_value value

into it.

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