Part of the Omron CJ-Series PLCs series — see the full model table, lifecycle status and replacement parts.
Omron CJ1W-SCU31-V1 — CJ Serial Unit, 2 x
SKU: CJ1W-SCU31-V1USD 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. It is manufactured by Omron Corporation. Hengyixin Automation stocks this controller in Xiamen and ships within 3-5 business days to most Asian, European, and North American ports.
Up to 16 SCUs per CJ rack, up to 32 serial ports system-wide 5-pin removable terminal block per port (no D-Sub on the SCU31-V1) 5 VDC 0.38 A from the CJ backplane -- no separate power supply required 5-pin removable terminal block per port (no D-Sub on the SCU31-V1)
Compatible controllers and sibling SKUs are listed in the related products row below.
Key Features
- 5 VDC 0.38 A from the CJ backplane -- no separate power supply required
- 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
- Up to 16 SCUs per CJ rack, up to 32 serial ports system-wide
- SKU: CJ1W-SCU31-V1
- Series: CJ-series CPU Bus Serial Communication Unit
Best-Fit Applications
- 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
- 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
Buying Checklist
- 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-CIF11 instead to convert an RS-232C port on a SCU21-V1 to RS-422A for 1:N communication.
- Pick CJ1W-SCU32 (SCU@2 high-speed) instead when 38.4 kbps is too slow or 230.4 kbps RS-422A is needed.
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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