Mitsubishi Electric Q172CPU Programming Manual page 229

9 REAL/VIRTUAL MODE SWITCHING AND STOP/RE-START
Table 9.3 Check Items List for Synchronous Encoder Axis
Check sequence
• Is the synchronous encoder connected
1
to the Q172EX ?
(3) Synchronous encoder axis check
(a) The items in Table 9.3 below are checked to determine the synchronous
encoder state.
If an error is detected, it switches to the virtual mode, but the applicable
system cannot be started. Correct the error cause in the real mode, and
switch to virtual mode again.
(b) When an error is detected, the error detection signal (M2407+20n) of the
applicable output module turns on, and the error code is stored in the
minor/major error code storage register.
Check item
Applicable synchronous
encoder
External
Output
synchronous
module
encoder
9 - 4
Normal
condition
Not connected
— Connected
Cable break
Abnormal
condition