External I/O Signal Connection Example Using An External Safety Relay Unit - Mitsubishi Electric MELSERVO-J4 Series Instruction Manual

External I/O signal connection example using an external safety
relay unit
This connection is for source interface. For the other I/O signals, refer to the connection examples in the
following section.
Page 97 For source I/O interface
This connection example complies with the requirement of ISO/EN ISO 13849-1 category 3 PL d.
For details, refer to the safety relay module user's manual.
24 V
Fuse
+24V
Safety relay
module
Power
supply
MELSEC
(QS90SR2S)
24G
S1 or
EMG
0 V
S1: STO shut-off switch (STO switch)
S2: Start switch (STO release switch)
S3: On switch
S4: Off switch
KM1: Magnetic contactor
K3: Safety relay
EMG: Emergency stop switch
*1 To enable the STO function of the servo amplifier by using "Emergency switching off", change S1 to EMG. The stop category at this time
is "0". If STO is turned off while the servo motor is rotating, [AL. 63 STO timing error] will occur.
13 USING STO FUNCTION
462
13.3 Connection example
S2 K3
XS0 XS1 Z00 Z10
Control
circuit
X0 X1 Z01 Z11
COM0 COM1
*1
Z20
Z21
STOCOM
K3
TOFCOM
S4 EMG
S3
KM1
KM1
Servo amplifier
CN8
Control circuit
STO1
STO2
TOFB1
TOFB2
CN3
EM1
or
EM2
KM1
20
M
Servo motor