Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 1734-OW4 |
| Manufacturer | Allen-Bradley (Rockwell Automation) |
| Product Type | POINT I/O Digital Relay Output Module |
| Product Series | POINT I/O 1734 |
| Output Channels | 4 |
| Output Type | SPST, N.O. (Form A) Electromechanical Relay |
| Contact Rating (Voltage) | 5-30 VDC; 48 VDC @ 0.5 A; 125 VDC @ 0.25 A; 120/240 VAC @ 2.0 A |
| Current Rating Per Output | 2.0 A |
| POINTBus Current | 80 mA @ 5 VDC |
| Power Dissipation | 0.5 W (max) |
| Output Delay (On to Off) | 26 ms (max) |
| Initial Contact Resistance | 30 mΩ |
| Off-State Leakage Current | 1.2 mA (max) @ 240 VAC via snubber bleed resistor |
| Operating Temperature | -20…55 °C (-4…131 °F) |
| Terminal Base | 1734-TB, 1734-TBS, 1734-TOP, or 1734-TOPS |
| Mounting | DIN Rail (35 mm) |
| Enclosure Rating | IP20 (Open Style) |
Main Features and Advantages
Dry Relay Contacts for Mixed-Voltage Flexibility: The 1734-OW4 is one of the few POINT I/O output modules that can switch both DC and AC loads from the same module, and even different voltage levels on individual channels . Because the relay contacts are dry and isolated from the module’s internal power bus, you can wire channel 0 to switch a 24 VDC pilot valve while channel 1 controls a 120 VAC contactor—all within the same 1734-OW4 unit . This eliminates the need for separate output modules or interposing relays when mixed voltages are required.
Removal and Insertion Under Power (RIUP): The 1734-OW4 supports hot-swap replacement, allowing technicians to remove and replace the module while the system remains powered . Combined with the removable terminal base (1734-TB or equivalent), this feature preserves all field wiring connections during module replacement, reducing downtime to a matter of seconds and eliminating the risk of wiring errors during emergency repairs .
Comprehensive Diagnostics and Configurable Features: The 1734-OW4 integrates with Studio 5000 Logix Designer through Add-On Profiles (AOP), providing configuration options for fault modes, program modes, and channel-level behavior . Each output channel includes a status LED that indicates whether the relay contacts are open or closed, enabling quick visual verification of output states without requiring a meter . The module also supports Auto Device Replacement (ADR) to simplify recovery after hardware swaps .
Proven Relay Technology for Demanding Loads: The 1734-OW4 uses electromechanical relays rated for 2.0 A, making it suitable for switching inductive loads such as contactor coils, solenoid valves, and small motor starters . The module includes an internal snubber circuit to manage back-EMF from inductive loads, and the off-state leakage specification (1.2 mA at 240 VAC) accounts for the bleed resistor that ensures clean relay turn-off . For applications where all outputs switch the same voltage, solid-state modules like the 1734-OB4E may offer longer cycle life; the 1734-OW4 is the appropriate choice when mixed voltages or true dry-contact isolation is required .
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