Please read the ME-iDS manual and the ME-iDS help file (*.chm)
carefully prior to programming. You can open both of these docu-
ments through the “ME-iDS Control Center” or through the Win-
dows Start menu.
Two variables are introduced to describe the rectangular signal,
and apply equally to input and output. One value indicates the pe-
riod T, while the other value provides the duration of the pulse of
the first phase of the period t
1p
. For frequency measurement, the
measurement starts with the first rising edge, and finishes with
the next rising edge. The falling edge that lies between them de-
fines the end of the first phase. In pulse generator mode, output
normally starts with a high level, changing to the low level when the
first phase has elapsed.
The time reference is provided by a 66
MHz counter. It is config-
ured using the
function. A period of 15.15 ns fol-
lows from this, and is defined as the smallest unit of time. It is re-
ferred to below as “1 tick”. The resolution for T and t
1P
is therefore
1 tick (see also the specifications on page 29).
Note that the value of the maximum period T
max
. depends on the
duty cycle. A distinction is drawn between rectangular signals with
an asymmetrical duty cycle T
max. asym
. and a symmetrical duty cycle
T
max. sym
. The figures for the ME-5004 are:
T
max. asym
. = 16.25
s (0.06
Hz); T
max. sym
. = 32.5
s (0.03
Hz)
The wiring of the frequency inputs/outputs corresponds to the digi-
tal-I/Os. See chapter 3.3 on page 14.
Summary of Contents for ME-5004
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