Mitsubishi Electric MELSEC-L02SCPU User Manual page 268

(2) Warning
When a warning occurs, the following operations are performed.
• CH1 Warning (SM1888) turns on.
• A warning code corresponding to the warning is stored to the CH1 Warning code (SD1888) in decimal.
Different from errors, occurrence of a warning does not stop the operation of CH1. The SD value is always
updated with the latest warning code.
Interface Channel
CH1
CH2
Special relay
CH1
CH2
CH1
Special register
CH2
The following table lists the CH Warning codes.
CH
Warning
code
Name
(decimal)
CH1 CH2
0 Normal
Sampling count
3050 4050
value overflow
To reset a warning code, remove the cause first and then reset with CH1 Error reset command (SM1899). If the warning is
reset without removing the cause, it is detected again and the warning code is stored.
266
No.
SM1888
SM1908
SM1899
SM1919
SD1888
SD1908
Description

The sampling count value has
exceeded the following range.
-2147483648 to 2147483647
Name
Indicates whether to a warning of the high-speed
CH Warning counter function has occurred. Turns off when
CH Error reset command is turned on.
CH Error reset • Resets CH Warning code.
command • Turns off CH Warning.
A corresponding warning code is stored upon
CH Warning code warning. The stored value is reset when CH
Error reset command is turned on.
Operation at warning
occurrence
CH with a warning

Store either value
of -2147483648 or
2147486347 and
continue counting.
Description
Corrective action
Other
CH
 
Check that the value obtained
Not from "Input pulse speed
(pulse/s)  sampling time"
affected.
does not exceed the range.