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Omron CJ1W-SCU31-V1 — front view of the slim black CJ-series CPU bus module showing the OMRON wordmark, the CJ1W-SCU31-V1 type label, the COMM1/COMM2/RUN/ERC front-panel LEDs, and the two 5-pin RS-422A/RS-485 removable terminal blocks on the lower face

Omron CJ1W-SCU31-V1 — CJ Serial Unit, 2 x RS-422A/485

SKU: CJ1W-SCU31-V1

USD 195.00

CJ-series CPU-bus serial communication unit with two RS-422A/RS-485 ports, 5 VDC backplane powered, host link / NT link / Modbus-RTU slave.

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Product Overview

The Omron CJ1W-SCU31-V1 is the CJ-series CPU bus serial communication unit with two RS-422A / RS-485 ports. Each port connects to a field device, RS-422A multidrop chain, or RS-485 half-duplex network up to 500 m cable run, and each port can run a different protocol independently. The unit pulls 0.38 A from the 5 VDC CJ backplane -- no separate power supply -- and slots into any CPU bus unit position on the CJ rack. Pick the SCU31-V1 when the cabinet needs two long-distance RS-422A ports (for example, a Modbus RTU remote and an NT-LINK HMI on the same chassis).

SCU vs SCU@2 high-speed

The SCU3x-V1 is the standard-speed type at up to 38.4 kbps. The SCU@2 (SCU22 / SCU32 / SCU42) is the high-speed type that adds 115.2 kbps / 230.4 kbps on RS-232C and 230.4 kbps on RS-422A / RS-485 plus the NT-AL001 RS-232C/RS-422A link adapter for 1:N communication. Pick the SCU@2 when a 38.4 kbps ceiling is too slow for the device or the CJ1W-CIF11 adapter is needed. For a mixed-port panel, pick the SCU41-V1 (1 RS-232C + 1 RS-422A / RS-485 at 0.38 A).

Per-port protocols

Each of the two ports can be set independently to protocol macro (a sequence of predefined messages), Host Link (SYSWAY-compatible master / slave for CX-Programmer upload), NT Link 1:N (for an NS / NB HMI on the SCU port), serial gateway (auto FX FINS / Host Link / Modbus-RTU translation), no-protocol (raw byte send / receive), or Modbus-RTU slave (the unit acts only as a slave). The serial gateway mode is the typical pick when a third-party Modbus-RTU sensor needs to land on a CJ1 / NJ CPU as FINS.

Before ordering

Confirm the CJ rack has a free CPU bus unit slot (each SCU occupies one CPU-bus unit position). Up to 16 CPU-bus units sit on one CJ rack, so up to 16 SCUs and 32 serial ports per system. The RS-422A / RS-485 port uses a 5-pin removable terminal block on the front face -- the SCU31-V1 does NOT have a D-Sub connector. For RS-232C, pick the SCU21-V1. For 1:N RS-422A on a CJ1W-CIF11 adapter, pick the SCU41-V1 mixed-port sibling or the SCU@2 high-speed type.

Key Features

  • CJ-series CPU bus serial communication unit with TWO RS-422A / RS-485 ports on the front face
  • 5-pin removable terminal block per port (no D-Sub on the SCU31-V1)
  • RS-422A full-duplex 1:N multidrop or RS-485 half-duplex, up to 500 m cable run
  • Each port sets independently: protocol macro, host link, NT link (1:N), serial gateway, no-protocol, Modbus-RTU slave
  • 5 VDC 0.38 A from the CJ backplane -- no separate power supply required
  • Standard-speed communications at 1,200 to 38,400 bps (the SCU@2 high-speed type adds 115.2 / 230.4 kbps)
  • Up to 16 SCUs per CJ rack, up to 32 serial ports system-wide
  • COMM1 / COMM2 + RUN / ERC front-panel LEDs and per-port TX / RX indicator
  • Mounts in any CJ CPU-bus unit slot (CJ1M / CJ1H / CJ2H / CJ2M CPU racks)
  • Pair with the CJ1W-CIF11 adapter when the RS-232C port on a SCU21-V1 needs to extend to RS-422A 1:N
  • Distinguishing feature vs SCU41-V1: SCU31-V1 has two RS-422A/485 ports, SCU41-V1 has one RS-232C + one RS-422A/485
  • SKU: CJ1W-SCU31-V1
  • Series: CJ-series CPU Bus Serial Communication Unit

Best-Fit Applications

  • Two-port multidrop RS-422A HMI link to an NS / NB series touch panel at 500 m cabinet distance
  • Modbus-RTU slave gateway from a third-party inverter / temperature controller / power meter to a CJ1 CPU via the SCU serial-gateway mode
  • Long-distance field wiring on a C200H-to-CJ1 migration where the existing RS-422A wiring must be reused
  • Pair with a second SCU31-V1 for an eight-port multidrop RS-422A HMI fan-out on a large machine
  • Pick the SCU@2 high-speed sibling (SCU22 / SCU32 / SCU42) when 38.4 kbps is too slow for the device or the CJ1W-CIF11 adapter is needed

Buying Checklist

  • Pick CJ1W-SCU31-V1 for a CJ CPU-bus serial unit with two RS-422A / RS-485 ports at 0.38 A from the 5 VDC backplane.
  • Pick CJ1W-SCU21-V1 instead for two RS-232C ports (D-Sub 9-pin) when the field device is short-distance RS-232C.
  • Pick CJ1W-SCU41-V1 instead when one RS-232C and one RS-422A / RS-485 port are both needed on a mixed-port panel.
  • Pick CJ1W-SCU32 (SCU@2 high-speed) instead when 38.4 kbps is too slow or 230.4 kbps RS-422A is needed.
  • Pick CJ1W-CIF11 instead to convert an RS-232C port on a SCU21-V1 to RS-422A for 1:N communication.
  • Confirm the CJ rack has a free CPU-bus unit slot (up to 16 CPU-bus units per CJ1 / CJ2 CPU rack).

Technical Specifications

Series CJ-series CPU Bus Serial Communication Unit
Model CJ1W-SCU31-V1 (two RS-422A / RS-485 ports)
Port 1 / Port 2 RS-422A / RS-485, 5-pin removable terminal block
Modes RS-422A full-duplex or RS-485 half-duplex
Communication Speed 1,200 / 2,400 / 4,800 / 9,600 / 19,200 / 38,400 bps
Cable Distance 500 m maximum RS-422A / RS-485 total run
Power 0.38 A from 5 VDC CJ backplane (no external supply)
Protocols per Port (CJ mode) Protocol macro, host link, NT link 1:N, serial gateway, no-protocol, Modbus-RTU slave
Mounting One CJ CPU-bus unit slot, DIN-rail
System Capacity Up to 16 SCUs per CJ rack, up to 32 serial ports per system
Front Face Two 5-pin RS-422A / RS-485 terminal blocks, COMM1 / COMM2 / RUN / ERC LEDs
Approvals UL / cULus (Class 1 Div 2) / CE / NK / Lloyd

FAQ for CJ1W-SCU31-V1

What is the difference between CJ1W-SCU31-V1 and CJ1W-SCU41-V1?
The SCU31-V1 has two RS-422A / RS-485 ports. The SCU41-V1 has one RS-232C port (D-Sub 9-pin) plus one RS-422A / RS-485 port (5-pin terminal block). Pick the SCU31-V1 for a long-distance RS-422A / RS-485 multidrop HMI link or a Modbus-RTU field network. Pick the SCU41-V1 when the panel needs one short-distance RS-232C device (a barcode scanner, a serial-label printer) and one long-distance RS-422A port. Both pull 0.38 A from the 5 VDC backplane and run the same per-port protocol set.
What protocols does each SCU port support?
On a CJ system, each port can independently run protocol macro (a sequence of predefined send / receive messages), host link (SYSWAY-compatible, for CX-Programmer upload or a third-party SYSWAY master), NT link 1:N (for an NS / NB HMI panel on the same rack), serial gateway (automatic FINS / Host Link / Modbus-RTU conversion), no-protocol (raw byte send / receive), or Modbus-RTU slave (the SCU only acts as a slave, not as a master). On an NJ system the per-port list drops to protocol macro, serial gateway, no-protocol, and Modbus-RTU slave -- host link and NT link are not supported on the NJ via the SCU.
How many SCU units can one CJ rack carry?
Up to 16 CPU-bus units on one CJ rack, and each SCU takes one CPU-bus slot, so up to 16 SCUs and 32 serial ports per CJ1 / CJ2 system. The limitation is the 16 CPU-bus-unit ceiling per rack, not the SCU count itself. For a larger system, add a CJ1W-IC101 I/O control unit and an expansion rack, which raises the CPU-bus-unit ceiling to 32 per system. Each SCU draws 0.38 A from the 5 VDC backplane, so on a fully-loaded 16-SCU rack the backplane draw tops out around 6 A -- pick the CJ1W-PD025 PSU at 5.0 A on the 5 VDC rail.
Can the SCU31-V1 run at 115.2 or 230.4 kbps?
No. The SCU31-V1 is the standard-speed type with a top speed of 38.4 kbps on each port. For 115.2 kbps (RS-232C) or 230.4 kbps (RS-422A / RS-485) pick the SCU@2 high-speed type: the SCU22 (2 x RS-232C), the SCU32 (2 x RS-422A / RS-485), or the SCU42 (1 x RS-232C + 1 x RS-422A / RS-485). The SCU@2 also supports the CJ1W-CIF11 RS-232C to RS-422A adapter for 1:N NT link (the SCU31-V1 does not). Confirm the field device actually needs more than 38.4 kbps before paying the SCU@2 premium -- most Modbus-RTU slaves happily run at 19.2 kbps.

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