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3.2 Function List
3
SPECIFICATIONS
3.2 Function List
Table 3.3 lists the functions of the A/D converter modules.
Table3.3 Function list
Item Function Reference section
A/D conversion enable/
disable setting
(1) Specifies whether to enable or disable the A/D conversion for each channel.
(2) Since the conversion time is 10ms per channel, disabling A/D conversion of
unused channels can reduce the entire conversion time.
Section 3.4.2
A/D conversion method
(1) Sampling processing
The A/D conversion for analog input values is performed successively for each
channel, and the digital output value is output upon each conversion.
(2) Averaging processing
(a) Time averaging
A/D conversion is averaged in terms of time on a channel basis and a digital
average value is output.
(b) Count averaging
A/D conversion is averaged in terms of count on a channel basis and a
digital average value is output.
(c) Move averaging
The specified number of digital output values measured per sampling time
are averaged.
(3) Primary delay filter
A digital output value is smoothed according to the preset time constant.
Section 3.2.1
Maximum and minimum
values hold function
(1) The maximum and minimum values of the digital output values are retained in the
module.
Section 3.2.2
Input signal error
detection function
(1) A voltage or current input that is equal to or more than the input signal error
detection upper limit value, or equal to or less than the input signal error detec-
tion lower limit value is detected.
Section 3.2.3
Warning output function
(1) Process alarm
A warning is output when a digital output value is equal to or more than the pro-
cess alarm upper upper limit value, or equal to or less than the process alarm
lower lower limit value.
(2) Rate alarm
A warning is output when the digital output value changes in a rate by which the
digital output value reaches the rate alarm upper limit value or more, or the rate
alarm lower limit value or less.
Section 3.2.4
Conversion starting time
setting function
(Q66AD-DG only)
(1) Setting the A/D conversion starting time allows A/D conversion to be started at
the point when the output of the 2-wire transmitter stabilizes.
Section 3.2.5
Supply power ON/OFF
function
(Q66AD-DG only)
(1) The supply power to the 2-wire transmitter can be switched ON/OFF channel by
channel.
(2) Power is supplied to channels that have input range settings of "4 to 20mA
(2-wire transmitter input): 0
H", "4 to 20mA (Extended mode) (2-wire transmitter
input): A
H" or "User range setting (2-wire transmitter input): FH", and that are set
to "Enabled" in A/D conversion enable/disable setting (Un\G0).
Section 3.4.2
Scaling function
(1) Conversion of A/D conversion values to preset percentage values and loading
into the buffer memory is available.
Programming steps for the scaling can be eliminated.
Section 3.2.6
Online module change
(1) The module can be changed without the system being stopped.
*1
Chapter 7
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