Mitsubishi Electric MELSEC iQ-R Series User Manual page 304

Checking of deceleration start flag
The "deceleration start flag" is stored into the following buffer memory addresses.
n: Axis No. - 1
Monitor item
[Md.48] Deceleration start flag
Refer to the following for information on the storage details.
Page 479 Monitor Data
8 CONTROL SUB FUNCTIONS
302
8.8 Other Functions
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Monitor Storage details
value

0: Status other than below
1: Status from deceleration start to next operation start or manual
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pulse generator operation enable
Buffer memory address
Axis 1 to axis 16
2499+100n