SS1-t operation: Safe Stop 1—After deceleration, a shift to the
STO operation occurs.
STO operation: Safe Torque Off—The power supply of the
motor is turned OFF.
External Device Connection Example
Safety function/STO, SS1-t (EN 61800-5-2)
Safety devices
Controller with STO Sub-Function
JXCF-
PLC
V
SS1-t STO
Facilitates the safety designing of equipment and facilities (compliant with ISO/IEC standards)
∗1 The above safety integrity level is the max. value. The achievable level varies depending on
the configuration and inspection method of the component. Be sure to refer to “Safety
Manual: JXC#-OMY0009” for more information.
SIL (Safety Integrity Level)
A safety integrity level as defi ned by international standard IEC 61508/62061
There are 4 levels of safety, with the lowest being SIL 1 and the highest being SIL 4.
PL (Performance Level)
A scale used to defi ne the capability of safety-related parts to perform a safety function
as defi ned by international standard ISO 13849
There are 5 levels of safety function, with the lowest being PL a and the highest being PL e.
Certifi ed by a third-party organization
Safety PLCArea sensor
Controller with STO Sub-Function JXCF Series
When the STO signal is input from the safety device, after the SS 1 -t operation is completed, the
unit shifts to the STO operation and the power supply of the motor is turned OFF.
Emergency button
Electric actuator
24 VDC
EN 61508 SIL 3
∗
1
EN 62061 SIL CL 3
∗
1
EN ISO 13849-1 Cat. 3 PL e
EN 61800-5-2 STO, SS1-t
4
Step Motor Controller JXC Series
Speed
(Control)
Time
Speed
STO1/STO2 input
Stop category 1
Speed
Motor OFF
Motor power supply
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