Relay Output Modules | Allen-Bradley 1734-OW2
The Allen-Bradley 1734-OW2 is a 2-channel electromechanical relay output module designed for integration into the POINT I/O distributed automation architecture. Featuring isolated Form A normally-open single-pole single-throw (SPST) contacts, the module allows industrial PLCs to switch independent AC and DC electrical loads. It handles backplane power conversion internally, isolating control backplane communication from field-side switching circuits up to 250 V dielectric isolation.
Functional Performance & Relay Capabilities
Each of the two electromechanical relay channels supports switching currents up to 2.0 A at 240 V AC or 30 V DC under resistive loading conditions. Unlike 4-channel variants, the 1734-OW2 module provides flexible field-side power options: loads can be driven using an external power source or optionally jumpered through the POINT I/O internal field power bus via backplane power distribution terminals.
The contacts support operating switching frequencies of up to 0.3 Hz (one cycle every 3 seconds at rated load) and maintain a minimum contact life expectancy of 100,000 electrical operations under full rated load conditions. A low maximum off-state leakage current of 1.2 mA at 240 V AC through the snubber circuit ensures high signal integrity and prevents unwanted actuation of sensitive downstream control hardware.
Hardware Installation & Terminal Configuration
The module snaps directly onto standard DIN rails using a 1734-TB, 1734-TBS, 1734-TOP, or 1734-TOPS wiring base assembly. Removable Terminal Blocks (RTB) allow maintenance personnel to replace hardware without disconnecting field wiring. Built-in mechanical keying prevents incorrect module placement during field replacement.
| Parameter | Specification |
|---|---|
| Model | 1734-OW2 |
| Brand | Allen-Bradley / Rockwell Automation |
| Product Line | POINT I/O |
| Output Type | 2-Channel Form A Normally-Open (SPST) Relays |
| Contact Current Rating | 2.0 A per channel max (Resistive) |
| Pilot Duty Rating | R150 |
| Isolation Voltage | 250 V continuous (tested at 2550 V DC for 60 s) |
| Off-State Leakage Current | 1.2 mA max at 240 V AC |
| Backplane Power | 80 mA at 5 V DC |
| Power Consumption | 0.8 W |
| Power Dissipation | 0.5 W max |
| Maximum Switching Frequency | 1 operation every 3 s (0.3 Hz at rated load) |
| Contact Life Expectancy | ≥ 100,000 operations at rated load |
| Field Wire Size | 0.25 to 2.5 mm² (22 to 14 AWG) solid/stranded copper |
| Wire Insulation Rating | Rated at 85 deg C min |
| Signal Port Wiring Category | Category 1 |
| Enclosure Rating | Open-style |
| Operating Temperature | -20 to 55 deg C (-4 to 131 deg F) |
| Storage Temperature | -40 to 85 deg C (-40 to 185 deg F) |
| Weight | 0.26 kg (0.56 lbs) |
Terminal Block Connections
Field wiring terminates at the 8-pin removable terminal block (RTB) with the following pin assignments:
- Channel 0: Terminal 0 (Relay 0 output contact), Terminal 2 (Relay 0 output contact)
- Channel 1: Terminal 1 (Relay 1 output contact), Terminal 3 (Relay 1 output contact)
- Field Power Bus Options: Terminal 4/5 (V common), Terminal 6/7 (V supply)
Frequently Asked Questions
Q: Can the 1734-OW2 derive load switching power directly from the POINT I/O backplane? A: Yes. Unlike 4-channel relay modules in the POINT I/O family, the 1734-OW2 allows load power to be sourced from the internal field power bus by bridging the supply voltage to pins 6/7 (V supply) and pins 4/5 (V common). Alternatively, external power can be wired directly to the channel contacts.
Q: Can two channels on the same 1734-OW2 module be wired to switch different voltage levels? A: Yes. Because each Form A relay set is galvanically isolated up to 250 V, one channel can control a 24 V DC loop while the second channel controls a 120 V AC or 240 V AC load.
Relay Output Modules | Allen-Bradley 1734-OW2
Relay Output Modules | Allen-Bradley 1734-OW2
The Allen-Bradley 1734-OW2 is a 2-channel electromechanical relay output module designed for integration into the POINT I/O distributed automation architecture. Featuring isolated Form A normally-open single-pole single-throw (SPST) contacts, the module allows industrial PLCs to switch independent AC and DC electrical loads. It handles backplane power conversion internally, isolating control backplane communication from field-side switching circuits up to 250 V dielectric isolation.
Functional Performance & Relay Capabilities
Each of the two electromechanical relay channels supports switching currents up to 2.0 A at 240 V AC or 30 V DC under resistive loading conditions. Unlike 4-channel variants, the 1734-OW2 module provides flexible field-side power options: loads can be driven using an external power source or optionally jumpered through the POINT I/O internal field power bus via backplane power distribution terminals.
The contacts support operating switching frequencies of up to 0.3 Hz (one cycle every 3 seconds at rated load) and maintain a minimum contact life expectancy of 100,000 electrical operations under full rated load conditions. A low maximum off-state leakage current of 1.2 mA at 240 V AC through the snubber circuit ensures high signal integrity and prevents unwanted actuation of sensitive downstream control hardware.
Hardware Installation & Terminal Configuration
The module snaps directly onto standard DIN rails using a 1734-TB, 1734-TBS, 1734-TOP, or 1734-TOPS wiring base assembly. Removable Terminal Blocks (RTB) allow maintenance personnel to replace hardware without disconnecting field wiring. Built-in mechanical keying prevents incorrect module placement during field replacement.
| Parameter | Specification |
|---|---|
| Model | 1734-OW2 |
| Brand | Allen-Bradley / Rockwell Automation |
| Product Line | POINT I/O |
| Output Type | 2-Channel Form A Normally-Open (SPST) Relays |
| Contact Current Rating | 2.0 A per channel max (Resistive) |
| Pilot Duty Rating | R150 |
| Isolation Voltage | 250 V continuous (tested at 2550 V DC for 60 s) |
| Off-State Leakage Current | 1.2 mA max at 240 V AC |
| Backplane Power | 80 mA at 5 V DC |
| Power Consumption | 0.8 W |
| Power Dissipation | 0.5 W max |
| Maximum Switching Frequency | 1 operation every 3 s (0.3 Hz at rated load) |
| Contact Life Expectancy | ≥ 100,000 operations at rated load |
| Field Wire Size | 0.25 to 2.5 mm² (22 to 14 AWG) solid/stranded copper |
| Wire Insulation Rating | Rated at 85 deg C min |
| Signal Port Wiring Category | Category 1 |
| Enclosure Rating | Open-style |
| Operating Temperature | -20 to 55 deg C (-4 to 131 deg F) |
| Storage Temperature | -40 to 85 deg C (-40 to 185 deg F) |
| Weight | 0.26 kg (0.56 lbs) |
Terminal Block Connections
Field wiring terminates at the 8-pin removable terminal block (RTB) with the following pin assignments:
- Channel 0: Terminal 0 (Relay 0 output contact), Terminal 2 (Relay 0 output contact)
- Channel 1: Terminal 1 (Relay 1 output contact), Terminal 3 (Relay 1 output contact)
- Field Power Bus Options: Terminal 4/5 (V common), Terminal 6/7 (V supply)
Frequently Asked Questions
Q: Can the 1734-OW2 derive load switching power directly from the POINT I/O backplane? A: Yes. Unlike 4-channel relay modules in the POINT I/O family, the 1734-OW2 allows load power to be sourced from the internal field power bus by bridging the supply voltage to pins 6/7 (V supply) and pins 4/5 (V common). Alternatively, external power can be wired directly to the channel contacts.
Q: Can two channels on the same 1734-OW2 module be wired to switch different voltage levels? A: Yes. Because each Form A relay set is galvanically isolated up to 250 V, one channel can control a 24 V DC loop while the second channel controls a 120 V AC or 240 V AC load.
