Extension A/D Converter Module - Mitsubishi Electric NZ2EX2B-60AD4 User Manual

11.6.2

Extension A/D converter module

(1) When digital operation value cannot be read
Check item
Is there any problem with the wiring, such as looseness or
disconnection of analog signal lines?
Is the CPU module in the STOP status?
Is the input range setting correct?
Is A/D conversion disabled for the channels where the analog
value is to be input?
Is Initial data setting request flag (RY9) executed?
Are the (V+) and (I+) terminals connected when the current is
input?
Are the setting values of the averaging process setting
correct?
Is there any potential difference between the AG terminal and
the external device GND?
Is External power supply READY flag (RX2F) on?
Does the main analog module operate in offset/gain setting
mode or unit test mode?
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?
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
Check item
Does any input signal error occur?
Is external power supply READY flag (RX2F) on?
Does the main analog module operate in offset/gain setting
mode or unit test mode?
(3) When the digital operation value is out of the accuracy range
Check item
Is any measure against noise taken?
188
Check the faulty area by checking signal line visually or conductively.
Change the status of the CPU module to RUN.
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.
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.
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.
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)
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.
Connect the AG terminal and the external device GND.
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))
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.
Please consult your local Mitsubishi representative.
Check Input signal error detection flag (RWrA).
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))
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.
Take anti-noise measures including the use of shielded cables for connection.
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