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NX-SI / SO
Safety I/O Unit
Build a simple and flexible safety system
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Application Solutions
last update: April 1, 2025
Safety I/O Unit
Safety Input Units
| Unit
type |
Ap-
pear- ance |
Specification | Unit
version |
Model | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Number
of safety input points |
Number
of test output points |
Internal
I/O common |
Rated
input voltage |
OMRON
special safety input devices *1 |
Number
of safety slave con- nections |
I/O re-
freshing method |
||||
| Safety
Input Units |
 |
4 points | 2 points | Sinking
inputs (PNP) |
24 VDC | Can be
connected. |
1 | Free-Run
refreshing |
Ver. 1.1 | NX-SIH400 |
 |
8 points | 2 points | Sinking
inputs (PNP) |
24 VDC | Cannot be
connected. |
1 | Free-Run
refreshing |
Ver. 1.0 | NX-SID800 | |
*1 OMRON special safety input devices refer to devices listed below. These devices can be connected directly to the
NX-SIH400 without any dedicated controller. Refer to the NX-series Safety Control Unit User's Manual (Cat. No. Z930) for
NX-SIH400 without any dedicated controller. Refer to the NX-series Safety Control Unit User's Manual (Cat. No. Z930) for
details.
| Type | Model and corresponding PL and safety category |
|---|---|
| OMRON Single-beam Safety Sensors | E3ZS |
| OMRON Non-contact Door Switches *2 | D40A-2
D40A D40Z *3 |
| OMRON Safety Mats | UM *3, UMA *3 |
| OMRON Safety Edges | SGE *3 (4-wire connection) |
*2 The D41D High-Coded Non-Contact Safety Door Switch, which requires no dedicated controller, can be connected directly
to both the NXSIH400 and NX-SID800.
*3 Orders for The D40Z will be accepted until the end of April 2026. The UA, The UMA and The SGE were discontinued.
to both the NXSIH400 and NX-SID800.
*3 Orders for The D40Z will be accepted until the end of April 2026. The UA, The UMA and The SGE were discontinued.
Safety Output Units
| Unit
type |
Ap-
pear- ance |
Specification | Unit
version |
Model | |||||
|---|---|---|---|---|---|---|---|---|---|
| Number
of safety output points |
Internal
I/O common |
Maximum load
current |
Rated
voltage |
Number
of safety slave con- nections |
I/O re-
freshing method |
||||
| Safety
Output Units |
 |
2 points | Sourcing
outputs (PNP) |
2.0 A/point,
4.0 A/Unit at 40°C, and 2.5 A/ Unit at 55°C The maximum load current depends on the installation orientation and ambient temperature. |
24 VDC | 1 | Free-Run
refreshing |
Ver. 1.0 | NX-SOH200 |
 |
4 points | Sourcing
outputs (PNP) |
0.5 A/point and
2.0 A/Unit |
24 VDC | 1 | Free-Run
refreshing |
Ver. 1.0 | NX-SOD400 | |
Accessories
Not included.
Option
Unit/Terminal Block Coding Pins
| Product Name | Specification | Model |
|---|---|---|
| Unit/Terminal Block Coding Pins | For 10 Units (Terminal Block: 30 pins, Unit: 30 pins) | NX-AUX02 |
Terminal Block
| Product name | Specification | Model | |||
|---|---|---|---|---|---|
| No. of
terminals |
Terminal number
indications |
Ground terminal
mark |
Terminal current
capacity |
||
| Terminal Block | 8 | A/B | None | 10A | NX-TBA082 |
| 16 | A/B | None | 10A | NX-TBA162 | |
last update: April 1, 2025
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