3.7 I/O Signals
49
3.7.4 Forward/Reverse Run Prohibited Inputs (Overtravel Inputs)
The usual connection for forward/reverse run prohibited inputs P-OT and N-OT is shown below.
Connect these signals to limit switches to forcibly stop the servomotor when the machine movable part
travels beyond the allowable motion range. The servomotor will decelerate to a stop, and then the zero
clamp is performed. The maximum torque during deceleration to a stop will be the servomotor maxi-
mum torque.
Note: For forward/reverse run prohibited inputs, the SERVOPACK processing for stop-
ping is executed by the software. As the safety specifications of some applica-
tions may not satisfy local safety requirements, add external safety circuits as
required.
Related Parameters
• When executing JOG operation and the home position search operation using CX-Drive, the P-OT
and N-OT signals will be ignored. Alternative measures must be taken in case of overtravel.
Signal Name
Signal
Function
Forward Run
Prohibited Input
P-OT
ON at low (L) level
Forward run allowed (normal status)
OFF at high (H) level
Forward run prohibited (reverse run is
allowed)
Reverse Run
Prohibited Input
N-OT
ON at low (L) level
Reverse run allowed (normal status)
OFF at high (H) level
Reverse run prohibited (forward run is
allowed)
Parameter
Descriptions
Pn.50A
n.2
Forward run permitted when CN1-4 input signal is ON (L level)
n.8
Always forward run allowed
Pn.50B
n.
4
Reverse run permitted when CN1-3 input signal is ON (L level)
n.
4
Always reverse run allowed
WARNING
+24VIN
S
ERVOPACK
3
.
3
k
Ω
Photoco
u
pler
P-OT
7 mA
0V
24-VDC
power
su
pply
24V
3
.
3
k
Ω
Photoco
u
pler
N-OT
7 mA
0V
CN1-5
CN1-4
CN1-
3
TOEP_C710806_03A_1_0.book Seite 49 Montag, 2. Juli 2007 3:55 15
