B - 3
Appendices B STO Function
High-function General-purpose Inverter RX2 Series User’s Manual
B-1 Overview of STO Function
B
B-1-1 Response Time
Response time is defined as duration from input of an operation command for safety function to an acti-
vation of the function. In the case of STO function, the response time is duration until the power to the
Servomotor is shut off after STO signal is input.
In the case of 3G3RX2-series, the STO response time is 10ms or less.
Design a system to disallow devices that trigger hazardous conditions with consideration of this
response time.
The 3G3RX2-series features a function to diagnose errors of internal safety path.
When the function is used to detect the errors internal safety path, it holds a state with outputs to motor
being cut off regardless of STO signal status.
To input STO signal, the redundant double signals are needed to input. Also, the separated double STO
signals are needed to input external inverter. When both inputs are not used, the inputs can not con-
form to criteria/standard.
When you monitor the input status of STO signals or the detection status of errors internal safety path
from external devices, use EDM output terminals.
The periodic function test is carried out to verify STO function properly. You need to conduct the test
once a year or more in order to keep SIL/PL level prescribed in function safety system.
In this STO function test, check that output status to input ST1/ST2 and EDM signal status comply with
Status 1 to Status 4 of Signal Matrix Table in C-2-3 STO Confirmation Signal Output (EDM) Signal.
B-1-1 Response Time
B-1-2 Self-diagnosis of Internal Path
B-1-3 STO Input
B-1-4 Monitoring Output (EDM Output) of STO Status
B-1-5 Periodic Function Test
B-1-6 Safety Function
Function Criteria
STO
(Safe Torque Off)
IEC61800-5-2:2016
EN61800-5-2:2007
Stop category 0 EN 60204-1: 2006/A1:2009
B-1-7 Response Time
Function Value Notes
STO response time 10ms Time until the power to Servomotor is shut off after
ST1/ST2 signals go into STO status
EDM response time 20ms Time until EDM signals are turned ON after
ST1/ST2 signals go into STO status
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