When The Alm Led Turns On Or Flashes; When A Digital Output Value Cannot Be Read - Mitsubishi Electric MELSEC-Q series User Manual

11.3.3

When the ALM LED turns on or flashes

(1) When on
Check item
Is there any alarm output?
(2) When flashing
Check item
Is there any input signal error?
Is there any peak current detection?
11.3.4

When a digital output value cannot be read

Check item
• Are the k terminal and l terminal wired properly?
• Is the secondary side of the CT short-circuited?
Is a connection cable disconnected?
Is the CPU module in the STOP status?
Is the offset/gain setting correct?
Is the input range setting correct?
Is Conversion enable/disable setting (Un\G0) set to Disable (1) for
the channel to be used?
Is Operating condition setting request (Y9) performed?
Is the set value correct when an averaging process is specified?
If digital output values cannot be read even after taking the above actions, the module might fail. Please consult a local
Mitsubishi representative.
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Check Warning output flag (Process alarm) (Un\G50) or Warning
output flag (Rate alarm) (Un\G51).
Check Input signal error detection flag (Un\G49).
Check Peak current detection flag (Un\G301).
Refer to the following, and wire the k terminal and l terminal
properly.
• Wiring ( Page 140, Section 7.4)
Confirm the faulty part by checking them visually or conducting
electricity.
Change the status of the CPU module to RUN.
Check if the offset/gain setting is correct.
When a user range is selected, change the input range to a factory
default range and check if digital conversion is performed.
If the digital conversion is performed properly, configure the
offset/gain setting again.
Check CH Input range setting (Un\G150 to Un\G157). If the input
range setting is incorrect, start over the setting.
Check Conversion enable/disable setting (Un\G0), and enable the
digital conversion in the sequence program or intelligent function
module parameter.
Turn on then off Operating condition setting request (Y9), and check
if digital output values are stored in CH Digital output value
(Un\G11 to Un\G18).
If the values are stored properly, review the sequence program so
that Operating condition setting request (Y9) is turned on in the
program.
When time average is selected, satisfy the following condition.
• Set value  "4 (times) × Sampling cycle"
If the condition above is not satisfied, 0 is stored in CH Digital
output value (Un\G11 to Un\G18).
Action
Action
Action