Mitsubishi Electric M80V Series Manual page 394

M800V/M80V Series PLC Interface Manual
4 Explanation of Interface Signals
4.3 PLC Output Signals (Bit Type: Y***)
Cont. Signal name
B Servo OFF n-th axis
[Function]
The control axis can be in the servo OFF state (the state in which the servo motor loses driving force).
In servo OFF condition, positioning control is impossible but the position detection function itself remains enabled.
Therefore, the position is not lost.
This is a signal for each control axis, and the number at the end of the signal abbreviation (n = 1,2,3 ...) indicates the
control axis No.
[Operation]
When the "Servo OFF" signal (*SVFn) turns OFF, the corresponding control axis is set to servo OFF condition.
If the axis has moved for some reason while the servo is OFF, whether to compensate the movement amount at the next
servo ON can be determined by the parameter settings. ("#1064 svof" (Error correction))
<When displacement is corrected (follow-up)>
 An amount of motion equal to the displacement is commanded so that positioning error becomes zero.
 In this case, even if the "Servo OFF" signal is restored, machine position remains deviated from in-position. However,
the current position of the position counter has been updated by the amount of deviation, and the machine position is
corrected with the next absolute command. (The "Manual absolute" signal (ABSn) is turned ON when manual operation
is selected.)
<When displacement is not corrected>
 In this case, when the "Servo OFF" signal is restored, machine is moved to its original position by the amount of move-
ment.
<Servo-OFF during motion>
Servo OFF (*SVFn)
Axis motion
Servo ready
n-th axis
(*1) While the axis is moving, the servo turns OFF after decelerated and stopped.
(*2) Controller internal interlock by servo OFF (axis motion not possible)
[Caution]
These signals are all handled as B contacts.
Abbrev. $1
*SVF1 to 8 Y7A0 to 7
(*1)
Approx.
0.7 s
(*2)
381
$2 $3
Y7A8 to F Y7B0 to 7
(*3)
$4
Y7B8 to F
IB-1501616-D