PLC Digital Output Modules | Allen-Bradley 1771-ODZ PLC-5
The 1771-ODZ is an 8-point isolated AC digital output module designed for Allen-Bradley 1771 I/O chassis under PLC-5 processor control. Featuring eight individually isolated outputs arranged in four sets of two channels, it switches 120 VAC industrial loads, such as motor starters, solenoids, and control transformers. The module incorporates onboard surge suppression circuitry to absorb high-voltage line transients and supports 1/2-slot, 1-slot, or 2-slot I/O addressing modes within PLC-5 data tables.
Output Switching and Current Capabilities
Operating across a voltage range of 92 to 138 VAC, the 1771-ODZ provides continuous load handling rated up to 2.0 A per output point, subject to a maximum total module current of 6.0 A. Internal optical coupling and noise filtering protect backplane logic from field-side transients. Signal turn-on response time is typically 1 ms, while turn-off response is typically 8.3 ms. At full load, maximum power dissipation reaches 11.4 W, corresponding to a thermal dissipation rate of 38.9 BTU/hr.
Status Indicators and Fuse Protection
The front panel features 16 status LEDs organized into two distinct banks for operational diagnostics. The upper bank of 8 red LEDs indicates the active ON/OFF logic state of each individual output channel. The lower bank of 8 orange LEDs signals blown-fuse conditions per circuit, allowing quick fault isolation without manual troubleshooting across individual field runs.
Installation and Wiring Arm Interfacing
The 1771-ODZ mounts into any standard slot of a 1771 I/O chassis. Slot keying requires plastic bands placed between pins 4 and 6 on the lower backplane connector and between pins 34 and 36 on the upper backplane connector. Field wiring connects via a removable 1771-WD field wiring arm, allowing module replacement without disconnecting field wiring harnesses.
| Parameter | Specification |
|---|---|
| Model | 1771-ODZ |
| Brand | Allen-Bradley |
| Product Type | Isolated AC Digital Output Module |
| System Compatibility | PLC-5 Systems (1771 I/O Chassis) |
| Number of Outputs | 8 channels (4 isolated sets of 2) |
| Voltage Category | 120 VAC |
| AC Operating Voltage Range | 92–138 VAC |
| Max Continuous Current Per Output | 2.0 A |
| Max Continuous Current Per Module | 6.0 A |
| Backplane Current Draw | 350 mA |
| Addressing Modes | 1/2-slot, 1-slot, or 2-slot addressing |
| Turn-On Delay Time | 1.0 ms typical |
| Turn-Off Delay Time | 8.3 ms typical |
| Power Dissipation | 11.4 W max |
| Thermal Dissipation | 38.9 BTU/hr max |
| Electrical Protection | Onboard surge suppression, optical coupling |
| Status Indicators | 16 LEDs (8 red for output status, 8 orange for blown-fuse) |
| Wiring Arm Model | 1771-WD |
| Chassis Slot Keying Position | Between pins 4 & 6 (lower) and pins 34 & 36 (upper) |
| Weight | 1.44 lbs (0.65 kg) |
Frequently Asked Questions
Q: What do the orange status LEDs on the front panel of the 1771-ODZ indicate? A: The 8 orange LEDs indicate a blown-fuse condition on the corresponding output channel circuit, providing immediate front-panel fault diagnosis.
Q: What is the maximum output current rating for the 1771-ODZ module? A: Each individual output channel supports up to 2.0 A continuous continuous current, with a maximum combined limit of 6.0 A across the entire module.
Q: Which wiring arm is used with the 1771-ODZ module? A: The module connects to field wiring using a 1771-WD field wiring arm, which allows quick module replacement without unmounting individual field wires.
PLC Digital Output Modules | Allen-Bradley 1771-ODZ PLC-5
PLC Digital Output Modules | Allen-Bradley 1771-ODZ PLC-5
The 1771-ODZ is an 8-point isolated AC digital output module designed for Allen-Bradley 1771 I/O chassis under PLC-5 processor control. Featuring eight individually isolated outputs arranged in four sets of two channels, it switches 120 VAC industrial loads, such as motor starters, solenoids, and control transformers. The module incorporates onboard surge suppression circuitry to absorb high-voltage line transients and supports 1/2-slot, 1-slot, or 2-slot I/O addressing modes within PLC-5 data tables.
Output Switching and Current Capabilities
Operating across a voltage range of 92 to 138 VAC, the 1771-ODZ provides continuous load handling rated up to 2.0 A per output point, subject to a maximum total module current of 6.0 A. Internal optical coupling and noise filtering protect backplane logic from field-side transients. Signal turn-on response time is typically 1 ms, while turn-off response is typically 8.3 ms. At full load, maximum power dissipation reaches 11.4 W, corresponding to a thermal dissipation rate of 38.9 BTU/hr.
Status Indicators and Fuse Protection
The front panel features 16 status LEDs organized into two distinct banks for operational diagnostics. The upper bank of 8 red LEDs indicates the active ON/OFF logic state of each individual output channel. The lower bank of 8 orange LEDs signals blown-fuse conditions per circuit, allowing quick fault isolation without manual troubleshooting across individual field runs.
Installation and Wiring Arm Interfacing
The 1771-ODZ mounts into any standard slot of a 1771 I/O chassis. Slot keying requires plastic bands placed between pins 4 and 6 on the lower backplane connector and between pins 34 and 36 on the upper backplane connector. Field wiring connects via a removable 1771-WD field wiring arm, allowing module replacement without disconnecting field wiring harnesses.
| Parameter | Specification |
|---|---|
| Model | 1771-ODZ |
| Brand | Allen-Bradley |
| Product Type | Isolated AC Digital Output Module |
| System Compatibility | PLC-5 Systems (1771 I/O Chassis) |
| Number of Outputs | 8 channels (4 isolated sets of 2) |
| Voltage Category | 120 VAC |
| AC Operating Voltage Range | 92–138 VAC |
| Max Continuous Current Per Output | 2.0 A |
| Max Continuous Current Per Module | 6.0 A |
| Backplane Current Draw | 350 mA |
| Addressing Modes | 1/2-slot, 1-slot, or 2-slot addressing |
| Turn-On Delay Time | 1.0 ms typical |
| Turn-Off Delay Time | 8.3 ms typical |
| Power Dissipation | 11.4 W max |
| Thermal Dissipation | 38.9 BTU/hr max |
| Electrical Protection | Onboard surge suppression, optical coupling |
| Status Indicators | 16 LEDs (8 red for output status, 8 orange for blown-fuse) |
| Wiring Arm Model | 1771-WD |
| Chassis Slot Keying Position | Between pins 4 & 6 (lower) and pins 34 & 36 (upper) |
| Weight | 1.44 lbs (0.65 kg) |
Frequently Asked Questions
Q: What do the orange status LEDs on the front panel of the 1771-ODZ indicate? A: The 8 orange LEDs indicate a blown-fuse condition on the corresponding output channel circuit, providing immediate front-panel fault diagnosis.
Q: What is the maximum output current rating for the 1771-ODZ module? A: Each individual output channel supports up to 2.0 A continuous continuous current, with a maximum combined limit of 6.0 A across the entire module.
Q: Which wiring arm is used with the 1771-ODZ module? A: The module connects to field wiring using a 1771-WD field wiring arm, which allows quick module replacement without unmounting individual field wires.
