6-7
6-2 Forward and Reverse Drive Prohibition Functions
OMNUC G5-Series AC Servo Drives Users Manual (Built-in MECHATROLINK-II communications type)
6
Applied Functions
Drive Prohibition Input Selection (Pn504)
Set the operation of the Forward Drive Prohibition Input (POT) and the Reverse Drive Prohibition Input
(NOT). Install limit switches at both ends of the axis to prohibit the Servomotor from driving in the direction
specified by the switch. This can be used to prevent the workpiece from driving too far and thus prevent
damage to the machine. Set the operation to be performed upon forward and reverse drive prohibition input.
Precautions for Correct Use
Both signals are disabled (in a state in which drive prohibition will not operation) in the default
settings. If prohibiting the drive input is required, set the Drive Prohibit Input Selection (Pn504)
to either 0 or 2.
Drive
Prohibition
Input Selection
(Pn504)
Explanation
0
Forward drive prohibition input and reverse drive prohibition input enabled.
The operation when a signal is input is as follows.
Forward drive prohibition input shorted: Forward limit switch not operating and status normal.
Forward drive prohibition input open: Forward direction prohibited and reverse direction permitted.
Reverse drive prohibition input shorted: Reverse limit switch not operating and status normal.
Reverse drive prohibition input open: Reverse direction prohibited and forward direction permitted.
The Servomotor decelerates and stops according to the sequence set in Stop Selection
for Drive Prohibition Input (Pn505).
*1
If the forward and the reverse prohibition inputs are both open, a drive prohibition input
error 1 (Alarm No.38.0) occurs because it is taken that Servo Drive is in error condition.
1 Forward and reverse drive prohibition input disabled.
2
Forward and reverse drive prohibition input enabled.
If either the forward or the reverse prohibition input is open, a drive prohibition input error
1 (Alarm No.38.0) occurs.
*1.For details, refer to explanation for Stop Selection for Drive Prohibition Input (Pn505).
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