Example Of Use; Example Of Wiring; External Device - Omron RX2 Series User Manual

Appendices B STO Function
B-3 Example of Use
B-3-1

Example of Wiring

Procedure for connecting STO input to a safety controller is shown as an example.
The condition for use is the followings:
• Use external power supply as one for STO input.
• Never use EDM output.
Reset
Switch
STO Input
Safety switch
(Ex: Emergency Button)
B-3-2

External Device

Power supply connected to control terminals in 3G3RX2-series is needed to comply with SELV and
PELV.
Each ST1/ST2 signal must be separated physically and protected appropriately.
Device for communication of STO signals shall comply with safety standards like ISO13849-1 and
IEC61508, etc.
A safety system includes 3G3RX2-series must fulfill CAT.3, PL e /SIL3. Therefore, the 3G3RX2-series
must be combined with external safety devices that meet PL e/SIL3.
Test pulse input to ST1/ST2 shall be 300 us or less.
Combination of 3G3RX2-series with external safety devices is shown as below.
Manufacturer
OMRON
OMRON
OMRON
OMRON
B - 12
STO Output
Safety unit
* Applicable standard
(IEC61508, ISO13849)
Product Model
G9SA-301
G9SX-GS226-T15-RC
NE1A-SCPU01-V1
G9SP-N
High-function General-purpose Inverter RX2 Series User's Manual
Separated physically or
provided cable protection
(double shielded)
Applicable standard/criteria
ISO13849-1 cat4, SIL3
IEC61508 SIL1 to 3
IEC61508 SIL3
IEC61508 SIL3