CHAPTER 2 WIRING
Description of I/O Signals 2-69
2
OT detection: Sequence output signal (Reference value 20)
This signal is output if the over-travel (OT) signal is turned off.
Function
The OT detection ("20") sequence output is issued while the +OT (7) or -OT (8) sequence input
signal terminal remains turned off.
In addition, OT detection ("20") is turned on if the current position reaches the reference value of
the software OT detection position.
If “7” (positioning operation) is selected for PA1_01 (control mode selection), PA2_25 (position
command format) is enabled.
Select “0” (regular PTP) with PA2_25 to enable the software OT function.
Select “1” (non-overflow) with PA2_25 to disable the software OT function.
Parameter setting
To assign OT detection to a sequence output terminal, specify the corresponding value ("20") to
the output terminal function setting parameter.
Relevant description
(1) +OT detection (38)/-OT detection (39)
A + OT signal is detected during servomotor travel in the positive direction; while a - OT signal is
detected during travel in the negative direction.
Use sequence output signals to notify the host controller of detection of the + OT or - OT signal.
Connect to the host controller in general if the host controller is equipped with OT inputs.
(2) Software OT
This function is enabled after homing or position preset.
Set PA2_25 (software OT selection) at "1" (enable) to limit the position range of motion between
(PA2_26 (positive software OT detection position)) and (PA2_27 (negative software OT detection
position)).
If the range is exceeded, the motion is forcibly stopped with the OT detection ("20") sequence
output turned on.
Therefore, the motor stops at a position over the software OT detection position.
The + OT (or - OT) sequence input is mechanical position detection, while software OT is position
detection of the servo amplifier. Software OT to reverse the homing motion shall not be applied.
PA2_27: - software OT detection
position
PA2_26: + software OT detection
position
Movable range
Feedback position
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