Mitsubishi Electric MELSERVO-J4 MR-J4 TM Instruction Manual page 400

13. USING STO FUNCTION
13.1.5 Specifications
(1) Specifications
Functional safety
Safety performance (Note 2)
Mean time to dangerous failure
(MTTFd)
Diagnostic converge (DC)
Average probability of dangerous
failures per hour (PFH)
Number of on/off times of STO
CE marking
Note 1. This is the value required by safety standards.
(2) Function block diagram (STO function)
(3) Operation sequence (STO function)
Item
[1/h]
2. The safety level depends on the setting value of [Pr. PF18 STO diagnosis error detection time] and
whether STO input diagnosis by TOFB output is performed or not. For details, refer to the Function
column of [Pr. PF18] in section 5.2.6.
Shut-off signal (STO1)
Monitor signal (TOFB1)
Shut-off signal (STO2)
Monitor signal (TOFB2)
Servo motor speed
EM2 (Forced stop 2)
STO1 STO2
Magnetic contactor
Base circuit
(Supplying energy to
the servo motor)
STO (IEC/EN 61800-5-2)
ISO/EN ISO 13849-1 category 3 PL e, IEC 61508 SIL 3,
EN 62061 SIL CL3, EN 61800-5-2 SIL 3
100 years or more (Note 1)
medium (90% to 99%) (Note 1)
1,000,000 times
LVD: EN 61800-5-1
EMC: EN 61800-3
MD: EN ISO 13849-1, EN 61800-5-2, EN 62061
Base power
supply for
CN8
upper arm
Base power
supply for
lower arm
Shut-
off
0 r/min
ON
OFF
ON
OFF
ON
OFF
ON
OFF
13 - 3
Specifications
-9
6.40 × 10
Shut-
off
M
(8 ms)
Power
module
Servo motor