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Safety CPU Unit


Integrate safety into ultra-flexible, ultra-high-speed machine automation and build a distributed safety system

Regulations and Standards

NX-series Safety Control Units NX-SL5/SI/SO

Certification body NX-SL5500/SL5700 NX-SI/SO
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
• IEC 61131-6 *2 ---
UL • NRAG (UL 61010-1 and UL 61010-2-201
and UL 121201)
• NRAG7 (CSA C22.2 No. 61010-1 and
CSA C22.2 No. 61010-2-201 and CSA
C22.2 No. 213)
• NRAG (UL 508 and ANSI/ISA 12.12.01)
• NRAG7 (CSA C22.2 No. 142 and
CSA C22.2 No. 213)
• FSPC (IEC 61508 and ISO 13849) *2 ---
Shipbuilding Standards NK, LK

*1. The FSoE protocol was certified for applications in which OMRON FSoE devices are connected to each other.
For compatibility with FSoE devices other than OMRON FSoE devices, the customer must validate FSoE communications.
*2. Only NX-SL5500/5700 have obtained IEC 61131-6 and FSPC certifications.

The NX-series Safety Control Units allow you to build a safety control system that meets the following standards.
• Requirements for SIL 3 (Safety Integrity Level 3) in IEC 61508, IEC/EN 62061, (Functional Safety of Electrical/Electronic/Programmable Electronic Safety-related Systems)
• Requirements for PLe (Performance Level e) and for safety category 4 in EN ISO13849-1

General Specifications

Item Specification
Enclosure Mounted in a panel (open)
Grounding method Ground to 100 Ω or less
Ambient operating temperature 0 to 55°C
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
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/s2
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/s2, 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)

* The specification is for the Communication Control Unit, Safety Input Unit, and Safety Output Unit, not for the Safety CPU Unit.

Unit Specifications

Unit name Safety CPU Unit
Model NX-SL5500 NX-SL5700
Maximum number
of safety I/O points
1024 points 2032 points
Program capacity 2048 KB 4096 KB
Number of safet
master connections *1
128 254
Number of CIP Safety
originator connections
128 254
Number of CIP Safety
target connections
4 4
Number of originators
that can be connected with
a multi-cast connection
8 8
Number of FSoE maste
128 254
I/O refreshing method Free-Run refreshing
External connection
Indicators csm001105361_sp_3_1 csm001105361_sp_3_2
Hardware switch settings csm001105361_sp_3_3 csm001105361_sp_3_4
Dimensions 30 × 100 × 71 mm (W × H × D)
I/O power supply method Not supplied.
Current capacity of
I/O power supply terminals
No I/O power supply terminals
NX Unit power
consumption *2
3.35 W max.
Current consumption from
I/O power supply
No consumption
Weight 130 g max.
Installation orientation
and restrictions *3
Installation orientation: Upright installation
Restriction: None.

*1. This is the maximum number of Safety I/O connections that can be set to this Unit. The value is the total number of CIP Safety originator connections, CIP Safety target connections, and FSoE master connections.
*2. The cable length for the Units (Communication Control Unit and Power Supply Unit for NX Units) that supply power to the corresponding Unit must be up to 20 m.
*3. Only NX102 CPU Units and Communication Control Units can be connected. NX1P2 CPU Units or Communications Coupler Units cannot be connected.

Function Specifications

Refer to your local OMRON website for function specifications of the Safety Control Unit.

Version Information

Relationship between the Unit Versions of Safety Control Units and Sysmac Studio Versions

This section describes the combinations that can be used of the unit versions of the Safety Control Unit and NX102 CPU unit, and the version of the Sysmac Studio.

When connected with CPU rack

Safety Control Unit model and version NX bus master: CPU Unit
Model Unit version NX102 CPU unit Sysmac Studio
NX-SL5500 Ver.1.3 Ver.1.31 or later Ver.1.24 or later
Ver.1.4 Ver.1.40 or later
NX-SL5700 Ver.1.2 --- ---
Ver.1.3 Ver.1.31 or later Ver.1.24 or later
Ver.1.4 Ver.1.40 or later
NX-SIH400 Ver.1.0 Ver.1.30 or later Ver.1.22 or later
NX-SID800 Ver.1.0