Troubleshooting When S1 Indicator Is Lit In Red - YASKAWA MP210 Series User Manual

6.4.3 Troubleshooting when S1 Indicator Is Lit in Red

When the S1 LED indicator on the front panel of the MP2100/MP2100M lights/flashes in red, it is likely that a
serious failure (software error or hardware error) is occurring. Set the MP2100/MP2100M in the stopped status
(DIP SW 6: ON), and then investigate the cause using the following flowchart.
START
Check SW00050
SW00050 = 0001H?
YES
(Watchdog timer timeout)
Check SW00055
SW00055 = 0000?
YES
(User program error)
SW00055 = 0008H?
YES
(The faulty program is a function)
Check to see that SW00056 = 8000H.
Check SW00057 to learn the type of
drawing (H, L, I, A, or function) that
references the function.
SW00057 = 0008H?
YES (The reference source is a drawing)
Check SW00058 to learn the number of
the drawing that references the function.
Open the drawing that is the reference
source by using the MPE720 ladder
editor.
Check SW00059 to learn the step
number that references the function.
Find the function name that is written
in the step number.
Check the contents of the function, and correct the error.
(Check to see if there is an error such as infinite loop that may cause a watchdog timer
timeout.)
If no error is found in the function, check the set scan time
Note: 1. For details on the system registers from SW00050 to SW00059, refer to 6.4.5 (2) System Error Status.
2. For precautions when setting the scan time, refer to 5.5.3 Precautions when Setting or Changing the Scan
Time.
NO
(Hardware failure)
NO
Check the scan time setting
(System error)
NO
Check SW00055 to learn the
(The faulty program is
drawing type, H, L, I, or A.
a drawing.)
Check SW00056 to learn the
drawing number.
Check the drawing that may be the
cause.
If no error is found in the drawing,
check the set scan time.
NO (The reference source is a function)
Check SW00059 to learn the step
number that references the function.
Check all functions to see if there is
a function that is referenced in the
step number, because the function from
which the step number is referenced
could not be specified.
( )
6.4 Troubleshooting System Errors
Replace the
MP2100/MP2100M.
YES
(Hardware failure)
Is the set scan
time correct?
( )
( )
NO
Increase the scan
time.
6
6-13