Selection Guide for OMRON PLCs

Written by Jersey Lim

Updated at January 31st, 2023

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PLC Selection Guide Flowchart

Decision Tree

Am I controlling robots?

Yes
No
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NJR PLCs.

Do I require more than 60 I/O points including analog I/O?

Yes
No
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Do I need remote I/O?

Yes
No
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Do I need advanced functionalities such as IoT, SQL, OPC UA etc?

Yes
No
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Do I have legacy CJ expansion units?

Yes
No
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NJ PLCs

Do I have to control a lot of motion axes?

>15
<15
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NX701

NX102

Do I have legacy CJ expansion units?

Yes
No
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CJ PLCs

NX102

Do I need more than 30 digital inputs and 20 digital outputs?

Yes
No
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CP1H

NX102/CJ Series PLCs

Do I need remote I/O?

Yes
No
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Do I need to control a lot of motion axes?

>15
<15
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NJ501

Do I have legacy CJ expansion units?

Yes
No
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NJ101, NJ301.

NX1P2, NX102.

Do I need advanced functionalities such as IoT, SQL, OPC UA etc?

Yes
No
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NX102, NX1P2

CP Series PLC

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N Series PLCs

All NX series PLC has features:

Has at least one Ethernet/IP Port and one EtherCAT Port
IO Link capable with the usage of the IO Link Master Unit
Capable of achieving FSoE

NX series PLC Selection Guide

Item	Model	NX1P2	NX102	NX701
Appearance
Features		On board digital I/O Economic N-series PLC Serial option boards available	OPC-UA Capable Two Ethernet/IP ports for connection flexibility Built in MQTT protocol Built in SQL functionalities for certain models	OPC-UA Capable Two Ethernet/IP ports for connection flexibility Built in MQTT protocol Able to synchronise up to 256 axes Fastest cycle time of 125 µs New AI Controller Built in SQL functionalities
On board I/O		Up to 40 points input, 24 points output PNP/NPN model available	This unit has no built in onboard I/O	This unit has no built in onboard I/O
Expansions		Can connect up to two option boards Can connect up to 8 NX units to the PLC Maximum of 24 NX units for the entire controller (upon using an EtherCAT slave terminal)	Can connect up to 32 units to the PLC Maximum of 432 NX units for the entire controller (upon using an EtherCAT slave terminal)	Maximum of 4096 NX units connectable to the unit (upon using an EtherCAT slave terminal)
EtherCAT		Up to 16 EtherCAT slaves	Up to 64 EtherCAT slaves	Up to 512 EtherCAT slaves
Ethernet/IP Port		Up to 32 connections Maximum of 32 tag sets Maximum tag set size of 600 bytes Up to 30 TCP sockets	Up to 32 connections per port, 64 in total Up to 32 tag sets per port, 64 in total Maximum tag set size of 600 bytes Up to 60 TCP sockets	Up to 256 connections per port, 512 in total Up to 256 tag sets per port, 512 in total Maximum tag set size of 1444 bytes Up to 30 TCP sockets
Motion Axes		Maximum of 12 controlled axes	Maximum of 15 controlled axes	Maximum of 256 controlled axes
Communications		Built In: Ethernet/IP, EtherCAT, Modbus TCP, USB Expandable: Profinet, DeviceNet, Profibus
Execution Time (LD Instruction)		3.3 ns	3.3 ns	0.37ns

NJ Series PLC Selection Guide

All NJ PLC has features:

Able to work with legacy CJ expansions
Has one Ethernet/IP port and one EtherCAT port
MQTT ready - Function blocks ready
SQL Models available for each variant
IO Link capable with the usage of the IO Link Master Unit
Capable of achieving FSoE

Item	Model	NJ101	NJ301	NJ501	NJR
Appearance
Features		OPC UA Capable Able to work with large amount of Ethernet/IP tag sets	OPC UA Capable Able to work with large amount of Ethernet/IP tag sets	OPC UA Capable Able to work with large amount of Ethernet/IP tag sets	Designed to control OMRON robots OPC UA Capable Able to work with large amount of Ethernet/IP tag sets
Expansions		Maximum of 10 CJ expansions per CPU/Expansion rack Up to 40 CJ expansions per CPU
EtherCAT		Up to 400 NX units (on EtherCAT slaves)	Up to 4096 NX units (On EtherCAT slaves)
Ethernet/IP Port		Up to 32 connections Maximum of 32 tag sets Maximum tag set size of 600 bytes Up to 30 TCP sockets Expandable with CJ Ethernet/IP expansion cards
Motion Axes		Maximum of 2 controlled axes	Maximum of 8 controlled axes	Maximum of 64 controlled axes
Communications		Ethernet/IP, EtherCAT, Modbus TCP, USB, Profinet, Profibus, DeviceNet, User-Defined CAN
Execution Time		3.3 ns	2.0 ns	1.2ns

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C Series PLCs

Item	Model	CP1L-E	CP2E	CP1H	CJ2
Appearance
Features		General use PLC Onboard I/O Option boards available High speed counter for 4 axes Pulse output for two axes Built in Ethernet Port	Micro PLC for connectivity Up to 3 option ports Onboard I/O Up to two Ethernet ports Built in interrupts High speed counter	Onboard I/O Onboard analog I/O 8 built-in interrupt inputs High-speed counters differential for 4 axes Pulse output for 4 axes	High-speed interrupt function available on some models Pulse I/O Module available Ethernet/IP capable on some models
On board I/O		Up to 24 inputs and 16 outputs Relay, PNP, NPN models available	Up to 36 inputs and 24 outputs Relay, PNP, NPN models available	Up to 24 inputs and 16 outputs Relay, PNP, NPN models available	This unit has no built in onboard I/O
Expansion		Up to 2 option boards Up to 3 CP1W expansions	Up to 3 option boards Up to 3 CP1W expansions	Up to 2 option boards Up to 7 CP1W expansions Up to 2 CJ Special Bus/Special I/O Units with an adapter	Serial option boards available on certain models Up to 10 CJ expansion on the main unit Up to 3 expansion rack, 10 CJ expansion units each
Ethernet or Ethernet/IP Port		Up to 254 FINS nodes	Up to 254 FINS nodes	Up to 254 FINS nodes with the usage of option boards or ETN cards	Built in Ethernet/IP in certain models Up to 256 connections Up to 256 registrable tags Up to 722 words per tag Up to 16 TCP sockets
Built in communications		Ethernet, Modbus TCP, USB		USB	Ethernet/IP, USB
Expandable communications		Ethernet/IP tags using extra EIP cards, FINS node using extra ETN cards, Modbus RTU, Profinet, DeviceNet, User-Defined CAN, EtherCAT(slave)
Execution Time (Basic instructions)		0.61 μs	0.23 µs	0.10 μs	Up to : 0.016 μs