Part of the Omron CJ-Series PLCs series — see the full model table, lifecycle status and replacement parts.
Omron CJ1W-SCU42 — CJ SCU@2 Mixed Port, 1
SKU: CJ1W-SCU42USD 158.00
CJ-series SCU@2 high-speed mixed-port serial unit: 1 x RS-232C and 1 x RS-422A/485. 230.4 kbps, 0.36 A.
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Product Overview
The Omron CJ1W-SCU42 is the mixed-port member of the CJ SCU@2 high-speed serial communication family. 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.
0.36 A from 5 VDC CJ backplane Approvals: UC1, N, L, CE CJ-series SCU@2 high-speed CPU-bus serial communication unit Attach NT-AL001 RS-232C-to-RS-422A link adapter for 1:N long-distance RS-422A chains
Approvals: UC1, N, L, CE 0.36 A from 5 VDC CJ backplane
Approvals: UC1, N, L, CE 0.36 A from 5 VDC CJ backplane 0.36 A from 5 VDC CJ backplane Approvals: UC1, N, L, CE
Compatible controllers and sibling SKUs are listed in the related products row below.
Key Features
- 0.36 A from 5 VDC CJ backplane
- Approvals: UC1, N, L, CE
- CJ-series SCU@2 high-speed CPU-bus serial communication unit
- Attach NT-AL001 RS-232C-to-RS-422A link adapter for 1:N long-distance RS-422A chains
- SKU: CJ1W-SCU42
- Series: CJ-series CPU-bus high-function unit, SCU@2 high-speed family
Best-Fit Applications
- Skid-mount controller where COMM2 needs a screw-terminal RS-485 and COMM1 needs a D-Sub RS-232C
- Adding serial gateway routing from a CJ PLC to a Modbus-RTU slave field device
- Protocol-macro custom message exchange on the RS-232C port while RS-485 runs a standard protocol
Buying Checklist
- Pick the CJ1W-SCU22 instead when both ports should be RS-232C.
- Pick the CJ1W-SCU32 when both ports should be RS-422A / RS-485.
- Pick the CJ1W-SCU21-V1 when the cabinet only needs RS-232C on the standard-speed family.
Technical Specifications
| Series | CJ-series CPU-bus high-function unit, SCU@2 high-speed family |
|---|---|
| Model | CJ1W-SCU42 |
| Ports | 1 x RS-232C (D-Sub 9-pin) + 1 x RS-422A / RS-485 (5-pin removable terminal block) |
| Max Baud Rate | 230.4 kbps per port (SCU@2 high-speed) |
| Cable Run | RS-232C 15 m; RS-422A / RS-485 1,200 m |
| Protocols (CJ1 system) | Protocol macro, Host Link, NT Link 1:N, serial gateway, no-protocol, Modbus-RTU slave |
| Protocols (NJ system) | Protocol macro, serial gateway, no-protocol, Modbus-RTU slave (Host Link and NT Link not supported) |
| Current Draw | 0.36 A at 5 VDC from CJ backplane |
| Per-rack Limit | Up to 16 SCU / high-function CPU-bus units / 32 serial ports per CJ rack |
| Hot-Swap | Not supported |
| Dimensions | 31 x 90 x 81.9 mm (slim CJ CPU-bus form factor) |
| Approvals | UC1, N, L, CE |
Manufacturer documentation
Omron's own product page, where the manufacturer's current specification and lifecycle information are published. We are an independent distributor and cannot mirror those documents; the link goes to Omron's site.
FAQ for CJ1W-SCU42
What is the difference between CJ1W-SCU42 and CJ1W-SCU41-V1?
SCU42 is on the SCU@2 high-speed family (up to 230.4 kbps, RS-422A / RS-485 cable runs to 1,200 m). SCU41-V1 is on the SCU-V1 standard-speed family (up to 38.4 kbps at standard mode / 115.2 kbps at high-speed mode, RS-422A / RS-485 cable runs to 500 m). Both carry one RS-232C and one RS-422A / RS-485 port. Pick SCU42 for new high-speed builds; pick SCU41-V1 as a like-for-like spare on an existing standard-speed rack.
Is the CJ1W-SCU42 hot-swappable?
No. CJ-series SCUs are not hot-swappable — power the rack down before inserting or removing an SCU42. (The SRT2-series SmartSlice I/O blocks and a few CS1D duplex modules support hot-swap; the CJ1W-SCU42 does not.)
Can the CJ1W-SCU42 act as a Modbus-RTU master?
No. The SCU42 lists Modbus-RTU SLAVE in its per-port protocol menu, not master. Use the SCU as a slave and let the CJ CPU scan it via the serial gateway, or use a dedicated master module if the field device is a slave that the PLC needs to poll.
How many CJ1W-SCU42 units can sit on one CJ rack?
Up to 16 CPU-bus high-function units per CJ / CJ2 rack (CPU plus expansion racks), which gives up to 32 serial ports in the system when SCUs are the limiting factor. Confirm spare slots when planning a multi-SCU build.
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