Omron CJ1W-OD212 — 16-Pt PNP Output, Short-Circuit Alarm
SKU: CJ1W-OD212USD 49.00
CJ-series 16-point 24 VDC PNP (sourcing) transistor output unit with removable terminal block and load short-circuit protection per point. 0.5 A per point, 5 A per unit, 0.5 ms ON response, drives 24 VDC loads via sourcing.
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Product Overview
The CJ1W-OD212 is Omron's 16-point 24 VDC PNP (sourcing) transistor output unit for CJ-series PLCs, distinguished from the standard CJ1W-OD211 (NPN sinking) by its PNP sourcing topology and built-in load short-circuit protection with alarm flag. Each output drives 0.5 A continuous at 24 VDC, and the unit as a whole can deliver up to 5.0 A simultaneously. If any output shorts to ground, the unit detects the overcurrent within ~100 ms, latches that output OFF, and raises an alarm flag in CJ I/O memory that the PLC program can read to pinpoint the faulted channel — eliminating the burned-out triac / transistor that would otherwise be the failure mode of an unprotected output bank.
Decoding CJ1W-OD212 within the OD2xx family
The CJ1W-OD@@2 model code follows four positional digits: __1_ = 16-pt (vs 0_ = 8-pt, 3_ = 32-pt, 6_ = 64-pt); __2_ = PNP sourcing (vs 1 = NPN sinking, 3 = NPN high-speed, 4 = PNP high-speed); _X = connector type (1 = removable TB, 2 = Fujitsu/OTAX, 3 = MIL connector). The OD212 codepoint thus decodes as 16-point PNP-source removable-terminal-block with short-circuit protection. Siblings the engineer is likely to cross-shop: CJ1W-OD211 (16-pt NPN — for systems already wired for sink signals), CJ1W-OD213 (16-pt NPN high-speed 15 µs — for pulse-train stepper output), CJ1W-OD232 (32-pt PNP sourcing with MIL connector — for higher-density boards), CJ1W-OD261/OD262 (64-pt NPN — for I/O-dense panels), CJ1W-OD263 (64-pt PNP with MIL — for high-density PNP).
Short-circuit protection and alarm flag mechanism
Each of the 16 output transistors on the CJ1W-OD212 is monitored by an integrated current-sense comparator. When the load current exceeds the trip threshold (typically 0.7-1.0 A for >100 ms), the unit enters a fault state for that channel: the output transistor is forced OFF, a fault flag is set in the CJ I/O memory at the unit's allocated word (a single bit per output group, depending on the unit's slot), and the corresponding output LED goes dark.
PNP sourcing wiring
PNP sourcing means the output transistor switches the positive rail to the load. The field-device side: the load's terminal A is wired to the CJ1W-OD212 output point (input through the load's coil/relay), the load's terminal B is wired to the unit's COM (0V return). The external 24 VDC power supply's + terminal is wired to the unit's PWR terminal (the internal high-side switch), and the supply's 0 V terminal is wired to the unit's COM terminal. When the PLC program sets the output bit, the internal transistor closes between +24 VDC and the output point, sourcing current INTO the load.
Key Features
- CJ-series 16-point 24 VDC PNP transistor output unit
- Load short-circuit protection per output with alarm flag in CJ I/O memory
- Fault latches until PLC program clears
- 0.5 A per point continuous, 5.0 A per unit total
- Removable screw terminal block
- ON response time 0.5 ms max; OFF response time 1.0 ms max
- Leakage current 0.1 mA max
- Residual voltage 1.5 V max
- SKU: CJ1W-OD212
- Series: CJ1W I/O Basic Units (CJ-series expansion I/O)
- Voltage: 24 VDC
- I/O: 16 I/O
Best-Fit Applications
- Solenoid-valve bank on a horizontal form-fill-seal packaging machine — 16 PNP pneumatic solenoid valves for sealing jaws, diverters, and cut-off.
- Indicator lights and tower lamps on a CNC machine tool — 16 red/green/amber 24 VDC panel-mount LEDs with PNP source.
- Pneumatic gripper actuation on a pick-and-place gantry — 8 PNP gripper open/close solenoid pairs, plus 8 spare channels for the.
- Heating element control via SSR — 16 Omron G3NA-210B-UTU DC5-24 or G3PE-225B DC12-24V solid-state relays, where the OD212's PNP sourcing.
Buying Checklist
- Pick CJ1W-OD212 for 16-pt 24 VDC PNP sourcing output with short-circuit alarm — drives 24 VDC loads with built-in field-fault protection
- Pick CJ1W-OD211 for 16-pt 24 VDC NPN sinking output — same form factor but for Japanese-style sink-driver panels, no short-circuit alarm
- Pick CJ1W-OD213 for 16-pt NPN high-speed 15 µs output — for pulse-train stepper or servo pulse command, no short-circuit alarm
- Pick CJ1W-OD202 for 8-pt PNP sourcing with short-circuit alarm — half the density of OD212, useful when you only need 8 outputs
- Pick CJ1W-OD232 for 32-pt PNP sourcing with MIL connector — for higher-density panels, also has short-circuit protection
- Pick CJ1W-OD261/OD262 for 64-pt NPN sinking — for I/O-dense panels with no need for PNP
Technical Specifications
| Model | CJ1W-OD212 |
|---|---|
| Series | CJ1W I/O Basic Units (CJ-series expansion I/O) |
| Type | 16-point 24 VDC PNP (sourcing) transistor output unit with short-circuit alarm |
| Output Points | 16 points |
| Common Configuration | 1 common (all 16 points share one COM terminal) |
| Output Type | PNP (sourcing) — switches +24 VDC to the load |
| Rated Load Voltage | 24 VDC |
| Operating Load Voltage Range | 20.4 to 26.4 VDC |
| Maximum Load Current | 0.5 A per point, 5.0 A per unit |
| Leakage Current (OFF state) | 0.1 mA max |
| Residual Voltage (ON state) | 1.5 V max |
| Internal Current Consumption | 100 mA at 5 VDC (from CJ bus) |
| Mounting | CJ-series DIN-rail mount, occupies one slot on CJ bus |
| Dimensions (W × H × D) | 31 × 90 × 65 mm |
| Operating Temperature | 0 to +55 °C |
Resources & Downloads
FAQ for CJ1W-OD212
What's the difference between CJ1W-OD212 and CJ1W-OD211?
Both are 16-point 24 VDC 0.5 A transistor output units with the same removable terminal block and the same 5 A per-unit total rating. The differences are: (a) Output type — OD211 is NPN (sinking, switches 0V to the load), OD212 (this SKU) is PNP (sourcing, switches +24 VDC to the load). (b) Short-circuit protection — OD212 has per-output current detection + alarm flag, OD211 has no such protection (will burn out on a sustained short circuit).
How does the short-circuit alarm work on the CJ1W-OD212?
Each of the 16 outputs on the CJ1W-OD212 has a current-sense comparator that monitors the output transistor's current.
Can I mix PNP and NPN outputs on the same CJ1W-OD212?
No — all 16 outputs on a CJ1W-OD212 are PNP sourcing. The unit has only one COM terminal (shared 0V return for all 16 outputs), so all 16 outputs source +24 VDC from the unit's internal high-side switch. For a mixed panel with both PNP and NPN outputs, you need two separate units: CJ1W-OD212 (PNP sourcing) + CJ1W-OD211 (NPN sinking).
Is the CJ1W-OD212 compatible with NJ-series CPUs like the NJ501-1400?
Yes — the CJ1W-OD212 is fully compatible with NJ101, NJ301, and NJ501-series CPUs as a CJ-series expansion I/O unit on the CJ1W-PA@@@ / CJ1W-PD@@@ power supply + CJ1W-IC101 + CJ1W-II101 expansion rack. The NJ CPU treats the CJ1W-OD212 as a standard CJ I/O unit, allocating 1 CIO word (16 output bits) in the I/O map.
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