Omron Safety Relays & Controllers NZ | G9SA G9SP NX-SL

Omron Safety Relays, Controllers and Light Curtains

Omron / Safety

Safety relays, controllers, safety I/O and light curtains. Plus the ordering detail that is not in the model number.

Omron's safety range runs from simple hard-wired relays through configurable controllers to safety CPUs integrated into Sysmac. Which tier you need depends on how many safety functions the machine has and whether they need reconfiguring without rewiring.

Read the important note at the bottom of this page before ordering a safety replacement.

The power supply voltage is not in the model number

This is the ordering detail that catches people on G9SA, and it is unusual.

Omron states: specify the power supply voltage when ordering. A G9SA-301 is not a complete specification on its own. The voltage is a separate selection, commonly written as G9SA-301 AC/DC24.

So if you send us just the number off the relay, also tell us the coil voltage, or send a photo of the label. Otherwise we cannot quote it accurately.

The three tiers

Tier	Range	Use
Hard-wired relays	G9SA, G9SA-P, G9SR, G9SX	Simple, fixed safety functions
Configurable controllers	G9SP, NE1A	More zones than relay logic handles sensibly
Integrated safety CPU	NX-SL with NX-SI and NX-SO I/O	Standard and safety logic in one Sysmac Studio project

A common upgrade path is a plant running standalone G9SA relays on an older CJ1 line adding a G9SP when it outgrows hard-wired logic.

G9SA safety relay units

Model	Description
G9SA-301	3PST-NO, Category 4, 5 A, SPST-NC auxiliary, 1 or 2 channel input
G9SA-321	With OFF-delay outputs
G9SA-321-T075	OFF-delay, 0.5 to 7.5 second range
G9SA-321-T15	OFF-delay, 1 to 15 second range
G9SA-321-T30	OFF-delay, 2 to 30 second range
G9SA-501	Five pole
G9SA-TH301	Variant
G9SA-EX series	Expansion units
G9SA-P series	Negative common, NPN version

The OFF-delay ranges

Each has fifteen settable steps.

Suffix	Steps
T075	0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5 seconds
T15	1 through 15 seconds in 1 second steps
T30	2, 4, 6 through 30 seconds in 2 second steps

Units are set to maximum at the factory. A new relay will not arrive matching your machine's setting, so it needs configuring before commissioning.

The ranges overlap but are not interchangeable. If your application needs 5 seconds, a T075 gives it exactly, a T15 gives it exactly, and a T30 does not offer 5 at all. Check the required delay against the available steps.

Which relays take an expansion unit

Omron specifies the expansion unit connects to a G9SA-301, G9SA-501, G9SA-321 or G9SA-TH301.

If you are adding contacts to an existing installation, check your base relay is on that list.

A wiring note on the G9SA-P

From the Omron datasheet, worth knowing before commissioning: when using T23, make sure T21 and T22 are open. For 1-channel input, make sure T12 and T23 are shorted.

G9SR and G9SX

Model	Description
G9SR-BC201-RC	Safety relay unit
G9SR-AD201-RC	Safety relay unit
G9SR-EX031-T90-RC	Expansion unit with OFF-delay
G9SX-NS	Dedicated controller, used with certain safety switches

G9SP programmable safety controllers

Model
G9SP-N10S
G9SP-N10D
G9SP-N20S

These are standalone programmable safety controllers. The three models differ in local safety I/O capacity, so match the model to your input and output count rather than assuming they are interchangeable.

NE1A safety network controllers

Model	Description
NE1A-SCPU01-V1	Safety network controller
NE1A-SCPU02	Safety network controller

DST1 remote safety I/O

Model	Type
DST1-ID12SL-1	Safety input
DST1-MD16SL-1	Mixed safety I/O
DST1-MRD08SL-1	Mixed safety I/O with relay
DST1-XD0808SL-1	Safety I/O

NX safety, integrated with Sysmac

Model	Type
NX-SL3300	Safety CPU
NX-SL3500	Safety CPU
NX-SL5500	Safety CPU
NX-SIH400	Safety input unit
NX-SID800	Safety input unit
NX-SOH200	Safety output unit
NX-SOD200	Safety output unit
NX-SOD400	Safety output unit

Two NX safety rules

Safety units connect through the EtherCAT Coupler, not the CPU. Omron is explicit that Safety CPU, Safety Input and Safety Output units connect to an NX1P2 CPU via the EtherCAT Coupler Unit. The coupler is part of the architecture, not an option.

An NX-SL replacement must match the project configuration. The safety network configuration is stored in the Sysmac Studio project, so the replacement has to match not just the model but that configuration. It is not a straight swap in the way a hard-wired relay is.

See Sysmac NJ and NX for the controllers these units run under.

Light curtains

Range	Notes
F3SG-4RA	Advanced, general purpose applications
F3SG-4RE	Simplified applications
MS4800 series	Industrial grade, rugged and dirty environments

Light curtains are ordered by protective height and resolution as well as model family. Tell us the guarded opening dimensions and what you are detecting, and we will specify it.

F3S-TGR magnetic non-contact safety switches

Useful specifications from the Omron datasheet, because these get replaced on gap issues rather than failure.

Specification	Value
Operating distance, OFF to ON	10 mm, or 8 mm on NBPR and NBMR
Operating distance, ON to OFF	20 mm, or 12 mm on NBPR and NBMR
Recommended setting gap	5 mm
Actuator approach speed	4 mm/s minimum, 1000 mm/s maximum
Switching frequency	1 Hz maximum
Operating temperature, plastic housing	Minus 25 to plus 80 degrees C
Operating temperature, stainless housing	Minus 25 to plus 105 degrees C

The recommended 5 mm gap is the number to check. If a door switch is nuisance-tripping, the gap has often drifted as the door has sagged or the frame has moved. That is cheaper to fix than replacing the switch.

Note also the maximum approach speed of 1000 mm/s. A fast-moving guard can outrun the switch.

Stainless steel housings are available for wash-down and higher temperature areas, and are worth specifying in food processing.

Important: safety replacements

Safety components are certified as part of a machine's safety function, with a rated Category or Performance Level.

A like-for-like replacement of the same model number preserves that assessment. A substitution may not. A relay with a different contact configuration, a different OFF-delay range, or different input channels can change the achieved Performance Level even if it physically fits and appears to work.

Our position is simple. We will supply the exact model you specify. If you ask us to suggest an alternative we will tell you what we think is equivalent and what differs, but the decision on whether a substitution is valid for your safety function belongs to whoever is responsible for the machine's safety assessment. We are a parts supplier, not your safety engineer.

If the original is genuinely unobtainable, tell us and we will help you find it rather than pushing you toward a substitute.

What we can supply

Current production. G9SA, G9SP, NX-SL safety CPUs and NX safety I/O, F3SG light curtains and F3S switches. Quoted with a delivered lead time.

Earlier and discontinued. NE1A controllers, DST1 remote safety I/O, older G9S relays and MS4800 curtains. Surplus and tested used.

The NE1A and DST1 side matters. A lot of New Zealand machinery from the 2000s runs those, and when one fails the choice is a used original or a safety reassessment.

We buy Omron safety

If you are decommissioning a machine, the safety relays, controllers and switches are worth money to plants running the same generation. See Sell To Us.

Send us your model numbers

Send the full number and the power supply voltage, since that is not in the G9SA model number. On OFF-delay units include the T suffix. If you are replacing a discontinued unit, tell us the contact configuration and input channels so we can say what is genuinely equivalent. Quotes in NZD including GST.

Request a quote

Industech is an independent supplier of new, surplus and used industrial automation equipment. We are not an authorised distributor of, approved by, sanctioned by, or affiliated with OMRON Corporation. Omron and Sysmac are trademarks of OMRON Corporation. All trademarks, brand names and model numbers are the property of their respective owners and are used here for identification purposes only. Information on this page is for identification and does not constitute a safety assessment.