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3 Safety Function
MITSUBISHI CNC
(2) Dedicated wiring STO function
[1] System configuration
This method is used to shut off the motor power with STO function only for the specific axis.
For example, to shut off the motor power with STO function only for the magazine rack axis, install a safety
door for tool change and directly connect the door open/close signal to the STO signal input (CN8) of the drive
unit. Warning A4(sub-number 0001) is detected while STO function is shutting off the motor power.
(Note) Always insert the provided short-circuit connector to CN8 for other than magazine rack axis and
cause short circuit in the STO signal.
Manufacturer : Tyco Electronics < Type > Connector set: MR-D05UDL3M-B
< A system configuration example when using dedicated wiring STO function >
[2] Input/output signal and operation sequences
The drive unit is equipped with a connector (CN8) which provides dedicated wiring STO function. The energy
supply to a motor can completely be shutoff by using this connector with external safety device. The following
wiring and parameter setting (SV113,SP229/bit8) are required when using the connector (CN8).
Dedicated wiring STO function can be disabled by inserting the following connector to CN8.
Manufacturer : Tyco Electronics < Type > Connector set: MR-D05UDL3M-B
Connector for dedicated wiring STO signal (CN8) and signal array
Signal name Connector pin No. Details I/O class
STO_COM CN8-3 STO input signal common DI
STO1 CN8-4 STO input signal 1 DI
STO2 CN8-5 STO input signal 2 DI
TOF1 CN8-6 TOF output signal 1 (STO1 signal input state) DO
TOF2 CN8-7 TOF output signal 2 (STO2 signal input state) DO
TOF_COM CN8-8 TOF output signal common DO
CNC
CN8
MDS-D2/DH2
(1) External door open
(Dual signal input)
(2) STO signal is input
from the CN8 connector
(3) The STO function shuts off the
power for only the magazine rack axis.
Drive unit: Warning A4 (sub-number 0001)
Optical communication
Shutoff
command
STO1, STO2 signal
[Magazine rack axis]
STO shutoff
via CN8
Door
Series
CN8
STO1
STO2
TOF1
TOF2
7 8
STO1
5
STO_COM
6
TOF1
3
STO2
4
TOF_COM
1
TOF2
2
Safety input signal
IO unit
for NC controller
MDS-D2/DH2 Series
Connector for dedicated wiring
STO input/output signal (CN8)