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11.6.2 Extension A/D converter module
(1) When digital operation value cannot be read
If the digital operation value cannot be read even after the above actions are taken, the failure of the extension A/D converter
module is a possible cause.
Please consult your local Mitsubishi representative.
(2) When an A/D conversion completed flag does not turn on in the normal mode
(3) When the digital operation value is out of the accuracy range
Check item Action
Is there any problem with the wiring, such as looseness or
disconnection of analog signal lines?
Check the faulty area by checking signal line visually or conductively.
Is the CPU module in the STOP status? Change the status of the CPU module to RUN.
Is the input range setting correct?
Verify Range setting (address: 0203H) by using the engineering tool or the dedicated
instruction.
If the input range setting is incorrect, set the range again by program or engineering tool.
Is A/D conversion disabled for the channels where the analog
value is to be input?
Check A/D conversion enable/disable setting (address: 0202H) by using the engineering tool
or the dedicated instruction. Then, set A/D conversion to be enabled by program or
engineering tool.
Is Initial data setting request flag (RY9) executed?
Turn on and off Initial data setting request flag (RY9) using the engineering tool to check if the
digital operation value is stored in CH Digital operation value (RWr12 to RWr15).
When the problem has been solved, check the program again.
Are the (V+) and (I+) terminals connected when the current is
input?
For the current input, always connect the terminals (V+) and (I+) referring to the following.
• Wiring of External Device and Terminal Block ( Page 63, Section 6.6)
Are the setting values of the averaging process setting
correct?
When the time average processing is selected, set the value to be not less than "Four (times)
× Sampling period".
If the condition above is not met, digital operation values remain 0.
Is there any potential difference between the AG terminal and
the external device GND?
Connect the AG terminal and the external device GND.
Is External power supply READY flag (RX2F) on?
If the digital operation value cannot be read out from the extension A/D converter module,
check the status of external power supply READY flag (RX2F). If external power supply
READY flag (RX2F) is off, adjust external power supply READY flag (RX2F) to turn on with
reference to the following: ( Page 197, Appendix 1.1 (12))
Does the main analog module operate in offset/gain setting
mode or unit test mode?
If the drive mode of the main analog module is offset/gain setting mode or unit test mode,
change the drive mode to another one.
Is it impossible to read out an on or off state of the external
input normally if the following actions are taken: checking all
the items listed above; checking the LEDs of the module;
performing CC IE Field diagnostics by engineering tool; and
checking the error codes?
Please consult your local Mitsubishi representative.
Check item Action
Does any input signal error occur? Check Input signal error detection flag (RWrA).
Is external power supply READY flag (RX2F) on?
If A/D conversion completed flag is not turned on for the extension A/D converter module,
check the status of external power supply READY flag (RX2F). If external power supply
READY flag (RX2F) is off, adjust external power supply READY flag (RX2F) to turn on with
reference to the following: ( Page 197, Appendix 1.1 (12))
Does the main analog module operate in offset/gain setting
mode or unit test mode?
If the drive mode of the main analog module is offset/gain setting mode or unit test mode,
change the drive mode to another one.
Check item Action
Is any measure against noise taken? Take anti-noise measures including the use of shielded cables for connection.
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