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 - Omron RX2 Series User Manual

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.
B-1-2 Self-diagnosis of Internal Path
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.
B-1-3 STO Input
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.
B-1-4 Monitoring Output (EDM Output) of STO Status
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.
B-1-5 Periodic Function Test
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-1-6 Safety Function
Function
STO
(Safe Torque Off)
Stop category 0
B-1-7 Response Time
Function
STO response time
EDM response time
High-function General-purpose Inverter RX2 Series User's Manual
Criteria
IEC61800-5-2:2016
EN61800-5-2:2007
EN 60204-1: 2006/A1:2009
Value
10ms Time until the power to Servomotor is shut off after
ST1/ST2 signals go into STO status
20ms Time until EDM signals are turned ON after
ST1/ST2 signals go into STO status
Appendices B STO Function
Notes
B
B - 3