Simplified Analog I/O Function - Mitsubishi Q Series User Manual

3 SPECIFICATIONS

3.2.15 Simplified analog I/O function

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(2) Micro voltage, voltage, current input
The value converted from the digital output value within the range between the
scaling range lower limit (buffer memory address: 198, 214) and the scaling
range upper limit (buffer memory address: 197, 213) is stored in the scaling
value.
Full-scale*1 should be set to a value under 20000.
The scaling width upper limit and scaling width lower limit are not used.
*1 The absolute value of (Scaling range upper limit - Scaling range lower limit)
If the scaling upper/lower limit values of which full-scale is larger than 20000
are set, a write data error (error code 4) occurs.
In this case, the scaling is performed for the set upper limit value and the
lower limit value of (the upper limit value -20000).
POINT
The scaling is performed even if the scaling range upper/lower limit value is set as
the upper limit value is smaller than the lower limit value.
The following figure illustrates the movement of the scaling range.
Example) When setting the lower limit value 5000 and upper limit value 1000 in the
range of 1 to 5V
1.000V
5000
This function enables extra channels of the Q62HLC to be used as simplified
thermocouple/micro voltage input modules, analog/digital conversion modules,
and digital/analog conversion modules*1.
The execution of the simplified analog I/O function is performed by manual
control mode 2. Set 3 for the control mode (buffer memory address: 50, 82).
The following describes how to use the analog input and analog output.
(1) Analog input
Monitors the measured value (PV) (buffer memory address: 9, 10).
(2) Analog output
Set the digital value 0 to 4000 (current value is 4 to 20mA) of the analog output
to the MAN output setting (buffer memory address: 51, 83).
When not using the analog output, set a value ranging from -32768 to -1.*2
*1: There is no equivalent function to the analog/digital conversion module and
digital/analog conversion module.
*2: The output is near 0mA.
1.001V ••• 4.999V
4999 ••• 1001
MELSEC-Q
5.000V
1000
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