The 1791DS-IB8XOB8 is a distributed hardware block engineered for DeviceNet Safety architectures deploying the CIP Safety protocol. Operating as a decentralized station on standard networks, this solid-state block delivers functional safety interface management by encoding and decoding deterministic safety-state variables close to production field instrumentation. By providing built-in microcontrollers that execute automated cross-checking and diagnostic tests, the device isolates operating vulnerabilities to protect automation systems where the de-energized off-state governs safe machine criteria.
The physical enclosure contains an integrated combination layout featuring eight safety sinking inputs and eight safety sourcing solid-state outputs. The single-channel or dual-channel input paths accommodate dual-channel equivalence or complementary pairing topologies to fulfill strict emergency stopping or optical curtain tracking logic. The current-sourcing output points switch direct current voltage potentials outward to actuator loads up to rated margins. This module type communicates across central processors via network profiles managed in unified engineering software platforms.
| Parameter | Specification |
|---|---|
| Manufacturer | Rockwell Automation / Allen-Bradley |
| Brand | Guard I/O DeviceNet Safety |
| Part Number | 1791DS-IB8XOB8 |
| Module Type | 16-Point Digital Combination Block Module |
| Number of Safety Inputs | 8 Sinking Channels |
| Number of Safety Outputs | 8 Sourcing Solid-State Channels |
| Number of Test Outputs | 4 Sourcing Channels |
| Nominal Input/Output Voltage | 24V DC |
| DeviceNet Supply Voltage Window | 11V DC to 25V DC |
| Communications Current Consumption | 110 mA at 24V DC |
| Sourcing Output Current Rating | 0.5 A per channel maximum |
| Input Voltage (On-State) | 11V DC minimum |
| Input Voltage (Off-State) | 5V DC maximum |
| Enclosure Requirement Rating | IP54 (IEC 60529) or higher |
| Operating Temperature | -10 to 55 degC |
| Storage Temperature | -40 to 85 degC |
| Relative Humidity Range | 5% to 95% non-condensing |
| Country of Origin | USA |
| Weight | 0.42 kg |
| Dimensions | 80 mm x 196 mm x 77 mm |
| Connector Pin | Function |
|---|---|
| I0 to I7 | Safety Sinking Input Connection Nodes |
| T0 to T3 | Test Pulse Monitoring Outputs |
| O0 to O7 | Safety Sourcing Output Transistor Nodes |
| V, M | External 24V DC Auxiliary Operational Voltage and Return Rails |
| DeviceNet Terminal | Network Power and Communication Bus Line (V+, CAN_H, Shield, CAN_L, V-) |
Hook the upper structural anchoring bracket of the module base directly onto a standard 35 mm wide industrial DIN rail. Align the bottom retention assembly and supply perpendicular force until the block snaps into a flux fit. Fasten rigid mechanical end plates at both boundary ends of the block array to preserve structural stability against mechanical sliding.
Leave a clear physical void zone extending at least 50 mm above and below the module outer casing walls. This continuous passage ensures natural convective thermal dispersion and leaves adequate structural clearance for routing large multi-conductor signal cabling bundles.
Run a short, heavy-gauge copper bonding lead from the local functional chassis earth terminal block straight to the master electrical control cabinet subpanel framework. Keep the ground pathway connection path as brief as possible to ensure maximum dissipation of surrounding high-frequency industrial noise.
Connect the external DeviceNet communication cable metallic screen shield to a ground potential point strictly at the primary network power supply terminal. Never splice or common-tie the signal cabling or sensory input lines within shared wireways holding high-potential alternating current lines or heavy motor conductors.
What constitutes the safety state of the inputs and outputs?
The safety state of both the data loops and physical hardware points is defined as the off-state.
Can the test output nodes be safely leveraged to power low-current auxiliary coils?
No, test outputs are not safety outputs and must never be applied as safety-rated drive connections.
What primary field hazard does the test pulse circuit address?
It allows continuous micro-intermittent signal line tracking to identify line cross-overs or direct wire-to-wire short circuits.
How are the device address values adjusted on this particular block?
The node address is set manually using the mechanical rotary switches accessible on the front panel assembly.
What configuration is required for the external DC power source supplying this module?
The primary direct current supply line must possess double or reinforced insulation properties to meet electrical safety mandates.
What is the minimum electrical threshold that registers as a logical on-state?
An incoming signal matches the logical on condition when the input voltage equals or exceeds 11V DC.
Does this model require specific cabinet provisions for open environments?
Yes, the hardware must be mounted in an electrical enclosure rated for IP54 or higher to keep out contaminants.
How do the front indicators reflect active fault states inside the hardware block?
The front-mounted MS and NS status lights alter color or flashing intervals to reveal distinct module faults or connection drops.
Can the input points handle two separate single-channel emergency stop buttons?
Yes, the software profiles allow configuring the points for independent single-channel operation rather than dual-channel monitoring.
What package format handles the physical data profiles for third-party tools?
Electronic Data Sheets provide the direct textual parameters required by configuration utility software.
Global Express Shipping
Returns & Warranty
Manufacturer: Allen-Bradley
Product No.: 1791DS-IB8XOB8
Country of origin:United States
Product Type: Digital Combination Module
Barcode: 8537101190
Payment: T/T, Western Union
Weight: 420g
Dimensions: 80 mm x 196 mm x 77 mm
Shipping port: Xiamen
Warranty: 12 months
The 1791DS-IB8XOB8 is a distributed hardware block engineered for DeviceNet Safety architectures deploying the CIP Safety protocol. Operating as a decentralized station on standard networks, this solid-state block delivers functional safety interface management by encoding and decoding deterministic safety-state variables close to production field instrumentation. By providing built-in microcontrollers that execute automated cross-checking and diagnostic tests, the device isolates operating vulnerabilities to protect automation systems where the de-energized off-state governs safe machine criteria.
The physical enclosure contains an integrated combination layout featuring eight safety sinking inputs and eight safety sourcing solid-state outputs. The single-channel or dual-channel input paths accommodate dual-channel equivalence or complementary pairing topologies to fulfill strict emergency stopping or optical curtain tracking logic. The current-sourcing output points switch direct current voltage potentials outward to actuator loads up to rated margins. This module type communicates across central processors via network profiles managed in unified engineering software platforms.
| Parameter | Specification |
|---|---|
| Manufacturer | Rockwell Automation / Allen-Bradley |
| Brand | Guard I/O DeviceNet Safety |
| Part Number | 1791DS-IB8XOB8 |
| Module Type | 16-Point Digital Combination Block Module |
| Number of Safety Inputs | 8 Sinking Channels |
| Number of Safety Outputs | 8 Sourcing Solid-State Channels |
| Number of Test Outputs | 4 Sourcing Channels |
| Nominal Input/Output Voltage | 24V DC |
| DeviceNet Supply Voltage Window | 11V DC to 25V DC |
| Communications Current Consumption | 110 mA at 24V DC |
| Sourcing Output Current Rating | 0.5 A per channel maximum |
| Input Voltage (On-State) | 11V DC minimum |
| Input Voltage (Off-State) | 5V DC maximum |
| Enclosure Requirement Rating | IP54 (IEC 60529) or higher |
| Operating Temperature | -10 to 55 degC |
| Storage Temperature | -40 to 85 degC |
| Relative Humidity Range | 5% to 95% non-condensing |
| Country of Origin | USA |
| Weight | 0.42 kg |
| Dimensions | 80 mm x 196 mm x 77 mm |
| Connector Pin | Function |
|---|---|
| I0 to I7 | Safety Sinking Input Connection Nodes |
| T0 to T3 | Test Pulse Monitoring Outputs |
| O0 to O7 | Safety Sourcing Output Transistor Nodes |
| V, M | External 24V DC Auxiliary Operational Voltage and Return Rails |
| DeviceNet Terminal | Network Power and Communication Bus Line (V+, CAN_H, Shield, CAN_L, V-) |
Hook the upper structural anchoring bracket of the module base directly onto a standard 35 mm wide industrial DIN rail. Align the bottom retention assembly and supply perpendicular force until the block snaps into a flux fit. Fasten rigid mechanical end plates at both boundary ends of the block array to preserve structural stability against mechanical sliding.
Leave a clear physical void zone extending at least 50 mm above and below the module outer casing walls. This continuous passage ensures natural convective thermal dispersion and leaves adequate structural clearance for routing large multi-conductor signal cabling bundles.
Run a short, heavy-gauge copper bonding lead from the local functional chassis earth terminal block straight to the master electrical control cabinet subpanel framework. Keep the ground pathway connection path as brief as possible to ensure maximum dissipation of surrounding high-frequency industrial noise.
Connect the external DeviceNet communication cable metallic screen shield to a ground potential point strictly at the primary network power supply terminal. Never splice or common-tie the signal cabling or sensory input lines within shared wireways holding high-potential alternating current lines or heavy motor conductors.
What constitutes the safety state of the inputs and outputs?
The safety state of both the data loops and physical hardware points is defined as the off-state.
Can the test output nodes be safely leveraged to power low-current auxiliary coils?
No, test outputs are not safety outputs and must never be applied as safety-rated drive connections.
What primary field hazard does the test pulse circuit address?
It allows continuous micro-intermittent signal line tracking to identify line cross-overs or direct wire-to-wire short circuits.
How are the device address values adjusted on this particular block?
The node address is set manually using the mechanical rotary switches accessible on the front panel assembly.
What configuration is required for the external DC power source supplying this module?
The primary direct current supply line must possess double or reinforced insulation properties to meet electrical safety mandates.
What is the minimum electrical threshold that registers as a logical on-state?
An incoming signal matches the logical on condition when the input voltage equals or exceeds 11V DC.
Does this model require specific cabinet provisions for open environments?
Yes, the hardware must be mounted in an electrical enclosure rated for IP54 or higher to keep out contaminants.
How do the front indicators reflect active fault states inside the hardware block?
The front-mounted MS and NS status lights alter color or flashing intervals to reveal distinct module faults or connection drops.
Can the input points handle two separate single-channel emergency stop buttons?
Yes, the software profiles allow configuring the points for independent single-channel operation rather than dual-channel monitoring.
What package format handles the physical data profiles for third-party tools?
Electronic Data Sheets provide the direct textual parameters required by configuration utility software.
Global Express Shipping
Returns & Warranty
Orders are processed and delivered Monday-Friday (excluding public holidays).
For full eligibility, restocking fees, and international return details, please view our official Refund & Return Policy .
| Color pattern |
Red
Black
|
| Country of origin |
United States
|
| Power source |
DC Power
|
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