Allen-Bradley 1734-OW4 POINT I/O 4-Point Relay Output Module
The Allen-Bradley 1734-OW4 is a 4-channel electromechanical relay output module designed for the POINT I/O distributed controller architecture. Operating with normally-open single-pole single-throw (SPST) Form A isolated contacts, it allows control systems to switch mixed AC and DC voltages independently across each channel. The module connects to the backplane to draw internal logic power while isolating field-side load circuits from bus communications.
Operational Features & Relay Performance
Each of the four outputs functions as an individually isolated dry contact, meaning the module does not draw field power from the POINT I/O backplane power bus. This enables flexible wiring across different voltage levels on adjacent channels—such as operating 24 VDC control loops and 120 V/240 VAC pilot circuits on the same physical module. The electromechanical contacts support switching frequencies up to 20 cycles per minute (one operation every 3 seconds) with a minimum electrical contact life of 100,000 operations under fully rated loads.
Low leakage performance is maintained in the off-state (maximum 1.2 mA at 240 VAC), preventing false triggering of sensitive downstream loads. Energy efficiency is supported by a low thermal footprint, consuming 0.8 W total power with a maximum internal dissipation of 0.5 W.
Integration & Hardware Compatibility
The module mounts onto a 1734-TB, 1734-TBS, 1734-TOP, or 1734-TOPS terminal base assembly on a standard DIN rail. Field wiring terminates at the removable terminal block (RTB), allowing module replacement without disturbing signal cables. Mechanical keying slots prevent accidental insertion into base units configured for incompatible module types.
| Parameter | Specification |
|---|---|
| Model | 1734-OW4 |
| Brand | Allen-Bradley / Rockwell Automation |
| Product Line | POINT I/O |
| Output Type | 4-Channel Normally-Open (SPST) Relay Contacts |
| Contact Rating (Resistive) | 2 A at 240 V AC / 2 A at 30 V DC |
| Minimum Load Current | 10 mA at 5 V DC |
| Off-State Leakage Current | 1.2 mA max at 240 V AC |
| Backplane Power | 90 mA at 5 V DC |
| Power Consumption | 0.8 W |
| Power Dissipation | 0.5 W max |
| Maximum Switching Frequency | 1 operation every 3 seconds |
| Electrical Life Expectancy | 100,000 operations at rated load |
| Signal Port Wiring Category | Category 1 |
| Enclosure Type | Open-style |
| Operating Temperature | -20 to 55 deg C (-4 to 131 deg F) |
| Weight | 0.26 kg (0.56 lbs) |
Frequently Asked Questions
Q: Does the 1734-OW4 require a Field Power Distributor (1734-FPD) module to supply power to loads? A: No. Because the 1734-OW4 utilizes isolated dry electromechanical contacts, it does not draw load power from the POINT I/O internal field power bus. Load power must be wired directly to the channel terminals from an external AC or DC power source.
Q: Can 24 VDC loads and 120 VAC loads be switched simultaneously on the same 1734-OW4 module? A: Yes. Each output channel is individually isolated, allowing different operating voltages (e.g., 24 VDC on Channels 0-2 and 120 VAC on Channel 3) as long as voltage and contact current limits are respected.
Allen-Bradley 1734-OW4 POINT I/O 4-Point Relay Output Module
Allen-Bradley 1734-OW4 POINT I/O 4-Point Relay Output Module
The Allen-Bradley 1734-OW4 is a 4-channel electromechanical relay output module designed for the POINT I/O distributed controller architecture. Operating with normally-open single-pole single-throw (SPST) Form A isolated contacts, it allows control systems to switch mixed AC and DC voltages independently across each channel. The module connects to the backplane to draw internal logic power while isolating field-side load circuits from bus communications.
Operational Features & Relay Performance
Each of the four outputs functions as an individually isolated dry contact, meaning the module does not draw field power from the POINT I/O backplane power bus. This enables flexible wiring across different voltage levels on adjacent channels—such as operating 24 VDC control loops and 120 V/240 VAC pilot circuits on the same physical module. The electromechanical contacts support switching frequencies up to 20 cycles per minute (one operation every 3 seconds) with a minimum electrical contact life of 100,000 operations under fully rated loads.
Low leakage performance is maintained in the off-state (maximum 1.2 mA at 240 VAC), preventing false triggering of sensitive downstream loads. Energy efficiency is supported by a low thermal footprint, consuming 0.8 W total power with a maximum internal dissipation of 0.5 W.
Integration & Hardware Compatibility
The module mounts onto a 1734-TB, 1734-TBS, 1734-TOP, or 1734-TOPS terminal base assembly on a standard DIN rail. Field wiring terminates at the removable terminal block (RTB), allowing module replacement without disturbing signal cables. Mechanical keying slots prevent accidental insertion into base units configured for incompatible module types.
| Parameter | Specification |
|---|---|
| Model | 1734-OW4 |
| Brand | Allen-Bradley / Rockwell Automation |
| Product Line | POINT I/O |
| Output Type | 4-Channel Normally-Open (SPST) Relay Contacts |
| Contact Rating (Resistive) | 2 A at 240 V AC / 2 A at 30 V DC |
| Minimum Load Current | 10 mA at 5 V DC |
| Off-State Leakage Current | 1.2 mA max at 240 V AC |
| Backplane Power | 90 mA at 5 V DC |
| Power Consumption | 0.8 W |
| Power Dissipation | 0.5 W max |
| Maximum Switching Frequency | 1 operation every 3 seconds |
| Electrical Life Expectancy | 100,000 operations at rated load |
| Signal Port Wiring Category | Category 1 |
| Enclosure Type | Open-style |
| Operating Temperature | -20 to 55 deg C (-4 to 131 deg F) |
| Weight | 0.26 kg (0.56 lbs) |
Frequently Asked Questions
Q: Does the 1734-OW4 require a Field Power Distributor (1734-FPD) module to supply power to loads? A: No. Because the 1734-OW4 utilizes isolated dry electromechanical contacts, it does not draw load power from the POINT I/O internal field power bus. Load power must be wired directly to the channel terminals from an external AC or DC power source.
Q: Can 24 VDC loads and 120 VAC loads be switched simultaneously on the same 1734-OW4 module? A: Yes. Each output channel is individually isolated, allowing different operating voltages (e.g., 24 VDC on Channels 0-2 and 120 VAC on Channel 3) as long as voltage and contact current limits are respected.
