Allen-Bradley 1732DS Series Modules – 1732DS-IB8XOBV4 Digital Comb Input Module

Technical Dossier

Product Details And Specifications

Allen-Bradley 1732DS Series Technical Notes

The Allen-Bradley 1732DS ArmorBlock Guard I/O series is a distributed safety I/O platform engineered for deployment in high-demand industrial environments including chemical processing plants, nuclear facilities, oil refineries, and automotive assembly lines. Manufactured by Rockwell Automation, the 1732DS series operates on the DeviceNet Safety (DNet Safety) network protocol, enabling SIL 2 (IEC 61508) and PLe/Cat. 4 (ISO 13849) safety ratings without the need for a dedicated safety controller backplane. Its IP67-rated sealed housing allows direct field-level mounting, eliminating the need for control panel enclosures and reducing installation footprint in harsh environments. The series has achieved widespread global adoption across process industries where distributed safety architecture is mandated by functional safety standards.

The Evolution of 1732DS Architecture

The 1732DS series was introduced by Rockwell Automation as part of its ArmorBlock Guard I/O product line, designed to extend safety I/O capability to the machine level via DeviceNet Safety. Early deployments leveraged the series alongside GuardLogix safety controllers (1756-L6xS, 1756-L7xS) using the 1788-EN2DN or 1788-DNBO DeviceNet scanner bridges. As the industrial safety landscape evolved toward EtherNet/IP-based architectures, Rockwell introduced the 1732E ArmorBlock Guard I/O for EtherNet/IP, which serves as the primary modern successor to the 1732DS platform. Legacy 1732DS installations remain operational in facilities with existing DeviceNet Safety infrastructure, and Rockwell Automation continues to provide lifecycle support under its Active Mature product classification. Integrators maintaining 1732DS networks must account for DeviceNet Safety scanner slot limitations and node address management when expanding or replacing modules. Firmware compatibility between 1732DS nodes and GuardLogix controller versions is a documented constraint that must be verified prior to replacement.

1732DS Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly deployed modules within the Allen-Bradley 1732DS ArmorBlock Guard I/O series. Modules are classified by functional category.

Digital Safety Input Modules

• 1732DS-IB8XOBV4: 8-pt 24VDC safety input, 4-pt safety output, combo, M12 connector, DeviceNet Safety
• 1732DS-IB8: 8-point 24VDC digital safety input module, M12 micro connectors, IP67
• 1732DS-IB16: 16-point 24VDC digital safety input module, dual-channel capable, IP67
• 1732DS-IB8XOB8: 8-point safety input / 8-point safety output combination module, M12
• 1732DS-IB4XOB4: 4-point safety input / 4-point safety output, compact combo, M12 connectors
• 1732DS-IB8XOBV4S: 8-pt safety input, 4-pt valve output combo, spring clamp terminal variant

Digital Safety Output Modules

• 1732DS-OB8: 8-point 24VDC digital safety output module, sourcing, M12 micro connectors
• 1732DS-OB16: 16-point 24VDC digital safety output, high-density, IP67 housing
• 1732DS-OBV4: 4-point valve-style safety output module, 24VDC, M12 connectors
• 1732DS-OB8S: 8-point safety output, spring clamp terminal, panel-mount variant

Combination Safety I/O Modules

• 1732DS-IB8XOB4: 8-point safety input / 4-point safety output, asymmetric combo, M12
• 1732DS-IB4XOB8: 4-point safety input / 8-point safety output, output-heavy combo module
• 1732DS-IB8XOBV8: 8-point safety input / 8-point valve output, high-density combo

Network & Communication Accessories

• 1732DS-TAPS: DeviceNet Safety T-port tap, sealed M12, for 1732DS network trunk connection
• 1732DS-TAPD: DeviceNet Safety dual-port tap, drop-line connection accessory
• 1732DS-CABLE: Pre-molded DeviceNet Safety cable assembly for 1732DS field wiring

Quality Control for the 1732DS Range

The 1732DS series presents specific testing requirements due to its integrated DeviceNet Safety ASIC, dual-channel input logic, and sealed M12 connector interface. DriveKNMS applies the following verification procedures to all 1732DS units prior to dispatch: (1) Visual inspection of M12 connector pins, housing seals, and LED indicator lenses for physical integrity. (2) DeviceNet Safety node commissioning test using a GuardLogix-based test bench to verify node address assignment, electronic data sheet (EDS) recognition, and safety connection establishment. (3) Dual-channel input functional test: each input channel pair is exercised with simulated safety device signals to confirm cross-fault detection and discrepancy timing response within specification. (4) Output load test for combo modules: safety outputs are loaded to rated current (0.5A per point) and verified for correct ON/OFF switching and output fault reporting. (5) IP67 seal integrity check on all connector ports. Units that fail any stage of this protocol are quarantined and not returned to inventory.