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MELSEC-Q
3 SPECIFICATIONS
3.2 Function List
Table 3.3 lists the functions of the A/D converter modules.
Table 3.3 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) The conversion speed is 10ms regardless of the number of conversion
enabled channels.
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) Voltage/current input that exceeds the input signal error detection upper
limit value or falls below the input signal error detection lower limit value is
detected.
Section 3.2.3
Warning output function
(1) Process alarm
A warning is output if a digital output value exceeds the process alarm
upper upper limit value or falls below the process alarm lower lower limit
value.
(2) Rate alarm
A warning is output if the variation rate of a digital output value is so high
that the rate alarm upper limit value is exceeded, or is so low that the rate
alarm lower limit value is exceeded.
Section 3.2.4
A/D conversion starting
time setting function
(Q62AD-DGH 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
(Q62AD-DGH only)
(1) The power supply to the 2-wire transmitter can be switched ON/OFF
channel by channel.
(2) Power is supplied to the channel set for "Conversion enable" in the A/D
conversion enable/disable setting (buffer memory address 0: Un\G0).
Section 3.4.2
Online module change (1) The module can be changed without the system being stopped.
*1
Chapter 7
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