Mitsubishi Electric MELSEC Q Series Programming Manual page 228

6 TROUBLESHOOTING
Error Detail
code code Error contents
(SD32) (SD33)
Small oscillation
204
start disabled
Speed
monitoring
Mode switching
parameter
205 during small
block No.
oscillation
Speed monitor
210 request acceptance
disabled
PLC CPU safety

240 communication
cycle warning
(Note-1): Reset is possible by turning the PLC ready flag (M2000) ON from OFF or the Motion error detection flag (M2039) OFF from ON.
(Note-2): Regardless of whether the CPU where an error is detected is the PLC CPU or the Motion CPU, the safety signal module device number of the PLC
CPU is displayed. When errors are detected on several device numbers, the smallest number is displayed.
(Note-3): Reset is possible by turning the Motion error detection flag (M2039) OFF from ON.
(Note-4): Bits 0 to 2 correspond to the station numbers 1 to 3 of the safety signal module where the error is detected respectively.
(Note-5): When the safety observation error reset enable (SM810) is turned ON, resetting is available by executing the remote STOP of Motion CPU and then
executing the remote RUN from MT Developer2. Operate after confirming safety.
Table 6.2 Safety observation warning list (Continued)
Error cause
Small oscillation cannot be started since
the axis to which the small oscillation has
been requested is during the positioning
operation.
Small oscillation is cancelled by turning
off/on the real/virtual mode switching
request (M2043) during small oscillation.
Speed monitoring is not executed
because the speed monitor request signal
is turned on with the safety observation
error occurred.
The PLC CPU scan time exceeded
(safety communication cycle - 3.555[ms]).
Corrective action
Correct the program so that the small
oscillation request signal is not turned on
during positioning.
Also, correct the program so that positioning
is not started while the small oscillation
execute flag is on.
Execute small oscillation again after the
completion of the real/virtual mode
switching.
Remove the cause of the safety observation
error.
Set the safety communication cycle longer,
reduce the number of PLC CPU program
steps, or increase the number of PLC CPUs
etc. so that there is enough processing time
for the PLC CPU.
6 - 9
Relevant CPU
Reset
PLC Motion
CPU CPU

(Note-3)
(Note-5)


(Note-1)
