Regulations and Standards
Safety I/O Units NX-SI/SO
Certification body
Standards
TÜV Rheinland *1
• EN ISO 13849-1
• EN ISO 13849-2

• IEC 61508 parts 1-7

• IEC/EN 62061

• IEC/EN 61131-2

• IEC 61326-3-1
UL
• NRAG (UL 508 and ANSI/ISA 12.12.01)
• NRAG7 (CSA C22.2 No. 142 and CSA C22.2 No. 213)
Shipbuilding Standards
NK, LK
*1 Using the NX-series Safety I/O Units in conjunction with the NX-series Safety CPU Unit allows you to build a safety control
     system that meets the following standards:

     • Requirements for SIL 3 in IEC 61508 and IEC/EN 62061

    • Requirements for
PLe and Safety Category 4 in EN ISO 13849-1
   The NX-series Safety I/O Units are also registered for RCM, EAC, and KC compliance.
General Specifications
Item
Specification
Enclosure
Mounted in a panel (open)
Grounding method
Ground to 100 Ω or less.
Operating
environment
Ambient operating temperature
0 to 55°C (The upper limit of the ambient operating temperature
is restricted by the installation orientation.)
Ambient operating humidity
10% to 95% (with no condensation or icing)
Atmosphere
Must be free from corrosive gases.
Ambient storage temperature
-25 to 70°C (with no condensation or icing)
Altitude
2,000 m max.
Pollution degree
2 or less.
Noise immunity
Conforms to IEC 61131-2.
2 kV on power supply line (Conforms to IEC 61000-4-4.)
Insulation class
Class III (SELV)
Overvoltage category
II
EMC immunity level
Zone B
Vibration resistance
Conforms to IEC 60068-2-6.
5 to 8.4 Hz with 3.5-mm amplitude, 8.4 to 150 Hz, acceleration of

9.8 m/s
2, 100 minutes each in X, Y, and Z directions (10 sweeps
of 10 min each = 100 min total)
Shock resistance
Conforms to IEC 60068-2-27.
147 m/s
2, 3 times each in X, Y, and Z directions
Insulation resistance
20 MΩ between isolated circuits (at 100 VDC)
Dielectric strength
510 VAC for 1 min between isolated circuits,
leakage current: 5
mA max.
Installation method
DIN Track (IEC 60715 TH35-7.5/TH35-15)
Unit Specifications
Safety Input Units NX-SIH400/SID800
Unit name
Safety Input Unit
Model
NX-SIH400
NX-SID800
Number of safety
input points
4 points
8 points
Number of test
output points
2 points
2 points
Internal I/O common
PNP (sinking inputs)
Rated input voltage
24 VDC (20.4 to 28.8 VDC)
OMRON special
safety input devices
Can be connected.
Cannot be connected.
Number of safety
slave connections
1
I/O refreshing method
Free-Run refreshing
External connection
terminals
Screwless clamping terminal block (8
terminals)
Screwless clamping terminal block (16
terminals)
Indicators
Safety input current
4.5 mA typical
3.0 mA typical
Safety input
ON voltage
11 VDC min.
15 VDC min.
Safety input OFF
voltage/OFF current
5 VDC max., 1 mA max.
Test output type
Sourcing outputs (PNP)
Test output load
current
25 mA max.
50 mA max.
Test output
residual voltage
1.2 V max. (Between IOV and all output terminals)
Test output
leakage current
0.1 mA max.
Dimensions
12 × 100 × 71 mm (W × H × D)
Isolation method
Photocoupler isolation
Insulation resistance
20 MΩ min. between isolated circuits (at 100 VDC)
Dielectric strength
510 VAC for 1 min between isolated circuits, leakage current: 5 mA max.
I/O power supply
method
Power supplied from the NX bus
Current capacity of
I/O power supply

terminals
No applicable terminals.
NX Unit
power consumption
• Connected to a CPU Unit or a
Communication Control Unit *1

1.10 W max.

• Connected to a Communications Coupler

Unit *2

0.70 W max.
• Connected to a CPU Unit or a
Communication Control Unit *1

1.10 W max.

• Connected to a Communications Coupler

Unit *2

0.75 W max.
Current consumption
from I/O power supply
20 mA max.
Weight
70 g max.
Circuit layout
Terminal connection
diagram
Si0 to Si3: Safety input terminals
T0 and T1: Test output terminals
Refer to User's manual (Cat.No.Z930) for details.
Si0 to Si7: Safety input terminals
T0 and T1: Test output terminals
Refer to User's manual (Cat.No.Z930) for details.
Installation orientation
and restrictions
Installation orientation:
• Connected to a CPU Unit or a Communication Control Unit *1

Possible in the upright installation orientation.

• Connected to a Communications Coupler Unit *2

6 possible orientations.

Restrictions: Maximum ambient temperature is 50ºC for any orientation other than upright

installation.
Protective functions
Overvoltage protection circuit and short detection (test outputs)
*1 It can be connected to the NX102 CPU unit or communication control unit. It cannot be connected to the NX1P2 CPU unit.
*2 The NX-ECC20
EtherCAT Coupler Unit and NX-EIC202 EtherNet/IP Coupler Unit can be connected.
Safety Output Units NX-SOH200/SOD400
Unit name
Safety Output Unit
Model
NX-SOH200
NX-SOD400
Number of safety
output points
2 points
4 points
Internal I/O common
PNP (sourcing outputs)
Maximum load
current
2.0 A/point
4.0 A/Unit at 40°C

2.5 A/Unit at 55°C

The maximum load current depends on the

installation orientation and ambient

temperature. See Installation orientation

and restrictions.
0.5 A/point and 2.0 A/Unit
Rated voltage
24 VDC (20.4 to 28.8 VDC)
Number of safety
slave connections
1
I/O refreshing method
Free-Run refreshing
External connection
terminals
Screwless clamping terminal block (8 terminals)
Indicators
Safety output ON
residual voltage
1.2 V max. (Between IOV and all output terminals)
Safety output OFF
residual voltage
2 V max. (Between IOG and all output terminals)
Safety output leakage
current
0.1 mA max.
Dimensions
12 × 100 × 71 mm (W × H × D)
Isolation method
Photocoupler isolation
Insulation resistance
20 MΩ min. between isolated circuits (at 100 VDC)
Dielectric strength
510 VAC for 1 min between isolated circuits, leakage current: 5 mA max.
I/O power supply
method
Power supplied from the NX bus
Current capacity of
I/O power supply

terminals
IOG: 2 A max./terminal
IOG (A3 and B3): 2 A max./terminal
IOG (A7 and B7): 0.5 A max./terminal
NX Unit power
consumption
• Connected to a CPU Unit or a
Communication Control Unit *1

1.05 W max.

• Connected to a Communications Coupler

Unit *2

0.70 W max.
• Connected to a CPU Unit or a
Communication Control Unit *1

1.10 W max.

• Connected to a Communications Coupler

Unit *2

0.75 W max.
Current consumption
from I/O power supply
40 mA max.
60 mA max.
Weight
65 g max.
Circuit layout
Terminal connection
diagram
So0 and So1: Safety output terminals
IOG: I/O power supply 0 V


Refer to User's manual (Cat.No.Z930)

for details.
So0 to So3: Safety output terminals
IOG: I/O power supply 0 V


Refer to User's manual (Cat.No.Z930)

for details.
Installation
orientation

and restrictions
Installation orientation:
• Connected to a CPU Unit or a

Communication Control Unit *1

Possible in the upright installation

orientation.

• Connected to a Communications Coupler

Unit *2

6 possible orientations

Restrictions: For upright installation, the

ambient temperature is restricted as shown

below depending on the total Unit load

current.


For all installation orientations other

than upright installation, the ambient

temperature is restricted as shown

below according to the total Unit load

current.

Installation orientation:
• Connected to a CPU Unit or a Communication Control Unit *1

Possible in the upright installation

orientation.

• Connected to a Communications Coupler

Unit *2

6 possible orientations

Restrictions: None
Protective functions
Overvoltage protection circuit and short detection
*1 The NX102 CPU Unit and the NX-CSG Communication Control Unit can be connected. The NX1P2 CPU Unit cannot be connected.
*2 The NX-ECC20
EtherCAT Coupler Unit and NX-EIC202 EtherNet/IP Coupler Unit can be connected.
Version Information
The following table shows the possible combinations of versions of NX-series Safety I/O Units, CPU Units, Communications Coupler Units, Communication Control Unit, and Sysmac Studio. Available functions that are related to safety control vary depending on the versions of the units and Sysmac Studio. Refer to the NX-series Safety Control Unit User's Manual (Cat. No. Z930) for details.
Safety Control Unit
model and version
NX bus master:
CPU Unit
NX bus master:
EtherCAT Coupler Unit
NX bus master:
EtherNet/IP
Coupler Unit
NX bus master:
Communication

Control Unit
Model
Unit
version
NX102
CPU

unit
Sysmac
Studio
Commu-
nications
Coupler

Unit

NX-

ECC20[]
NJ/NX1P/
NX7

CPU Unit

*1
Sysmac
Studio
Commu-
nications
Coupler

Unit

NX-

EIC202
Sysmac
Studio
Commu-
nications
Control

Unit

NX-CSG
Sysmac
Studio
NX-SIH400
Ver.1.0
Ver.1.30
or later
Ver.1.22
or higher
Ver.1.2
or later
Ver.1.06
or later
Ver.1.07
or higher
---
---
Ver.1.00
or later
Ver.1.24
or higher
Ver.1.1
Ver.1.10
or higher
Ver.1.0
or later
Ver.1.10
or higher
Ver.1.24
or higher
NX-SID800
Ver.1.0
Ver.1.30
or later
Ver.1.22
or higher
Ver.1.1
or later
Ver.1.06
or later
Ver.1.07
or higher
Ver.1.0
or later
Ver.1.10
or higher
Ver.1.00
or later
Ver.1.24
or higher
NX-SOH200
Ver.1.0
Ver.1.30
or later
Ver.1.22
or higher
Ver.1.1
or later
Ver.1.06
or later
Ver.1.07
or higher
Ver.1.0
or later
Ver.1.10
or higher
Ver.1.00
or later
Ver.1.24
or higher
NX-SOD400
Ver.1.0
Ver.1.30
or later
Ver.1.22
or higher
Ver.1.1
or later
Ver.1.06
or later
Ver.1.07
or higher
Ver.1.0
or later
Ver.1.10
or higher
Ver.1.00
or later
Ver.1.24
or higher
*1 This is version information when the NJ/NX1P/NX7 CPU Unit is used as the EtherCAT master in the system. The Safety Control Unit cannot be connected directly to these CPU Units.