Unit type	Specification				Unit version	Model
Unit type	Maximum number of safety I/O points	Program capacity	Number of safety I/O connections	I/O refreshing method	Unit version	Model
Safety CPU Unit (NX-SL3[][][])	256 points	512KB	32	Free-Run refreshing	Ver. 1.1	NX-SL3300
Safety CPU Unit (NX-SL3[][][])	1024 points	2048KB	128	Free-Run refreshing	Ver. 1.1	NX-SL3500

Regulations and Standards

Safety CPU Units NX-SL3[][][]

Certification body	Standards
TÜV Rheinland	• 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

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, 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 ISO13849-1The NX-series Safety Control 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/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
Installation method		DIN Track (IEC 60715 TH35-7.5/TH35-15)

Unit Specifications

Unit name	Safety CPU Unit
Model	NX-SL3300	NX-SL3500
Maximum number of safety I/O points	256 points	1024 points
Program capacity	512 KB	2048 KB
Number of safety I/O connections	32	128
Number of FSoE master connections	32	128
I/O refreshing method	Free-Run refreshing
External connection terminals	None
Indicators
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 1**	• Connected to a CPU Unit *2 1.25 W max. • Connected to a Communications Coupler Unit 0.90 W max.
Current consumption from I/O power supply	No consumption
Weight	75 g max.
Installation orientation and restrictions	Installation orientation: • Connected to a CPU Unit 2 Possible in the upright installation orientation. • Connected to a Communications Coupler Unit 3 Six possible orientations. Restriction: None

*1 The cable length for the Units that supply power to the corresponding Unit must be up to 20 m.
*2 The NX102 CPU Unit can be connected. The NX1P2 CPU Unit cannot be connected.
*3 The NX-SL3300 can be connected to the NX-ECC20[] EtherCAT Coupler Unit and NX-EIC202 EtherNet/IP Coupler Unit.
The NX-SL3500 can be connected to the NX-ECC20[] EtherCAT Coupler Unit.

Combinations of CPU Unit, Communications Unit, and Software

The following table shows the NX-series CPU Unit, Communications Units, and Sysmac Studio editions that can be used with the NX-SL3[][][] Safety CPU Units.

CPU Unit and Communications Unit	NJ/NX Series CPU Unit *1	Communications Unit
CPU Unit and Communications Unit	NX102 CPU Unit	EtherCAT Coupler Unit NX-ECC20[]	EtherNet/IP Coupler Unit NX-EIC202	Communication Control Unit NX-CSG320
Edition of Sysmac Studio *2	Standard Edition	Standard Edition	Standard Edition Sysmac Studio Safety Edition	Standard Edition Sysmac Studio Safety Edition
NX-SL3300	YES	YES	YES	No
NX-SL3500	YES	YES	No	No

*1 The NX-SL3[][][] Safety CPU Unit cannot be connected directly to the NJ/NX1P/NX7 CPU Unit. The NX-ECC20[]
EtherCAT Coupler Unit is required to connect a system using these CPU Units.
*2 Refer to Version Information for the possible combinations of versions of Units and Sysmac Studio. The NX-I/O Edition
can be used for configuration of a stand-alone safety control system using the EtherNet/IP Coupler Unit and NX-SL3300
Safety CPU Unit.