PRODUCT INFORMATION
Product Overview
The Allen-Bradley 1746-NO8V is an SLC 500 analog output module. This module provides eight single-ended analog voltage channels for modulating field devices. It controls devices such as valves, dampers, louvers, and variable frequency drives. Each channel features 16-bit resolution corresponding to 320 microvolts per count. An internal R-2R ladder network executes digital-to-analog conversion.
The module supports selectable output voltage spans up to plus or minus 10.25V DC. Backplane current consumption draws 120 milliamps at 5V DC. It draws 160 milliamps at 24V DC when jumper J4 is set to rack power. Setting jumper J4 to external allows connection to a user-supplied 24V DC power source. Optical circuit isolation tested at 500V DC protects the chassis from field electrical noise.
TECHNICAL DATA
Technical Specifications
| Parameter | Specification |
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| Backplane Current (24 Volts) | 160 milliamps |
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| Backplane Current (5 Volts) | 120 milliamps |
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| Backplane Power consumption | 5.6W |
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| Backplane current consumption | 120 mA at 5V dc 160 mA at 24V dc (J4 jumper set to RACK) 0 mA at 24V dc (J4 jumper set to EXT) |
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| Category | PLCs |
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| Compatible chassis | Any 1746 chassis slot except slot 0 |
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| Module Type | Analog output module |
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| Optional Output Data Parameters | User defined scale limits Output clamping limit Output alarm limits Ramp rate/limit Preset fault value Output behavior under fault condition (reset, hold, preset) Alarms latch Reset latched alarms |
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| Output coding | -32,768 to +32,767 |
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| Output voltages | -10 to +10VDC; -10.25 to +10.25VDC; 0 to 10VDC; 0 to 5VDC and 1 to 5VDC. |
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| Output wiring | Single-ended |
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| Outputs | 8 |
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| Resolution | 16-bit 320 µV/count |
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| SLC Data Formats | Scaled engineering units Scaled for PID Proportional counts 1746-NO4 format User-defined scale |
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| Step Response | 60 milliseconds in, 2.5 milliseconds out |
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| UPC | 781180054570 |
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| Update Time | 540 microseconds/8 channel |
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| Weight | 1.00 lbs (0.45 kg) |
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TECHNICAL INFORMATION
Features
- Provides eight single-ended voltage output channels.
- Features 16-bit resolution at 320 microvolts per count.
- Includes built-in R-2R ladder digital-to-analog converter.
- Supports output voltage ranges up to plus or minus 10.25V DC.
- Offers 500V DC circuit isolation between field wiring and chassis backplane.
- Supports configurable data formats including scaled engineering units and PID.
- Allows power selection via chassis backplane or external 24V DC supply.
TECHNICAL INFORMATION
Applications
- Modulation control for industrial control valves and actuators.
- Speed reference commands for variable frequency drives.
- Airflow modulation for dampers and louvers.
- Analog setpoint output generation for SLC 500 automation systems.
TECHNICAL INFORMATION
Connections / Interfaces
- Single-ended field output wiring terminals.
- Internal jumper J4 selects backplane power or external 24V DC.
- SLC 500 chassis backplane interface.
TECHNICAL INFORMATION
Installation Guidelines
- Insert the module into any available 1746 chassis slot except slot zero.
- Configure jumper J4 for rack or external power before installation.
- Disconnect all power sources before inserting or removing the hardware.
- Route analog wiring away from high-voltage AC conductors to reduce noise.
TECHNICAL INFORMATION
Configuration Guidelines
- Select channel output data formats in SLC 500 programming software.
- Configure optional parameters including clamp limits and ramp rates.
- Define fault condition behavior to reset, hold, or set preset values.
TECHNICAL INFORMATION
Compatibility
- Compatible with Allen-Bradley SLC 500 modular chassis systems.
- Installs into any standard 1746 chassis slot except processor slot zero.
TECHNICAL INFORMATION
Compliance and Certifications
- cUL certified.
- CE marked.
- Certified for Class I, Division 2 Hazardous Locations.
COMPATIBILITY
Compatibility & Replacement
COMPATIBLE MODELSCompatible with Allen-Bradley SLC 500 modular chassis systems. Installs into any standard 1746 chassis slot except processor slot zero.
Verify compatibility against the exact Part Number, revision and manufacturer documentation before ordering.
PART VERIFICATION
Before You Order
Industrial automation parts can share similar model names, suffixes and revisions. Confirm the complete manufacturer Part Number before purchase.
01Check Part NumberMatch the complete ordering code on the existing unit.
02Confirm RevisionCheck suffix, hardware or firmware when applicable.
03Send a Label PhotoWe can review a clear label photo when identification is uncertain.
ORDERING PROCESS
From RFQ to Dispatch
1Submit Part Number2Verify Product Identity3Confirm Stock & Condition4Issue Quotation5Dispatch & Tracking
PRODUCT FAQ
Frequently Asked Questions
Which chassis slots can host the 1746-NO8V module?
The module installs into any 1746 chassis slot except slot zero. Slot zero is reserved for the processor.
What output voltage ranges does the 1746-NO8V support?
The unit supports -10 to +10VDC, -10.25 to +10.25VDC, 0 to 10VDC, 0 to 5VDC, and 1 to 5VDC.
How can the module be powered?
Power can be supplied from the rack backplane or an external 24V DC source using jumper J4.
