SKU: Allen Bradley 1756-OB32

Allen-Bradley 1756-OB32 ControlLogix Digital Output Module

Purchase the Allen-Bradley 1756-OB32 ControlLogix Digital Output Module with 32 points and electronic fusing. Brand New, Original Stock with Global Shipping. Secure this authentic industrial automation spare now.

The Allen-Bradley 1756-OB32, also cataloged as the 1756-OB32 ControlLogix 32 Pt 12/24V DC D/I Module, operates as a dedicated hardware component for physical output signal execution within ControlLogix chassis-based platforms.

Hardware Specifications

Parameter	Specification
Model	1756-OB32
Brand	Allen-Bradley
Origin	USA
Weight	0.35 kg
Dimensions	23.3 x 18.2 x 5.3 cm
Operating Temp	0 to 60 deg C
Power Consumption	4.8 W maximum at 60 deg C
Outputs	32 solid-state (sourcing configuration)
Operating Voltage Range	10 to 31.2 VDC
Backplane Current	300 mA at 5.1 VDC; 2 mA at 24 VDC
Output Current Per Point	0.5 A maximum at 50 deg C; 0.35 A maximum at 60 deg C
Output Current Per Module	16 A maximum at 50 deg C; 10 A maximum at 60 deg C
Surge Current Per Point	1 A for 10 ms, repeatable every 2 s
Compatible RTB	1756-TBCH, 1756-TBS6H

I/O Density Scaling and Backplane Bus Communication Velocity

The 1756-OB32 provides dense I/O scaling by pack-housing 32 distinct solid-state dc sourcing switches into a single slot configuration. This architecture minimizes total system chassis real estate requirements while operating on a high-speed backplane bus communication link. Using producer/consumer technology, the module broadcasts real-time output loop and state confirmation feedback across the backplane to master control hardware, maintaining strict deterministic update intervals regardless of concurrent logic load distribution.

Frequently Asked Questions

Q: What type of circuit protection is integrated into the 1756-OB32 module hardware?

A: The module incorporates electronic fusing that detects short-circuit or over-current faults on an individual channel basis. When a fault state occurs, the affected channel is isolated to prevent damage, and a fault bit is generated across the backplane bus to notify the logix processing unit.

Q: Is hot-swapping or Removal and Insertion Under Power (RIUP) supported for this module?

A: Yes, the 1756-OB32 supports RIUP. The module can be extracted or inserted while the chassis backplane is energized, provided the field-side Removable Terminal Block (RTB) is fully disconnected or the field wiring loop is completely unpowered to prevent inductive arcing.

Q: Does the module support sourcing or sinking field configurations?

A: The 1756-OB32 is structured exclusively as a sourcing output module. It sources DC voltage from the positive field power supply terminal to the connected industrial actuator, which must be returned to the negative DC common line.

Field Installation Guidelines

Chassis Alignment and Insertion: Insert the module into any available slot of the 1756 ControlLogix chassis by aligning the printed circuit board edge with the top and bottom card guides. Push straight into the backplane until the plastic interlocking side latches snap to a secured vertical stop.
Removable Terminal Block (RTB) Setup: Wire the field devices to the 1756-TBCH or 1756-TBS6H terminal block before mounting it to the module interface. Ensure the 36-pin mechanical keying wedges match the voltage profile intended for the 1756-OB32 hardware to prevent over-voltage damage.
Field Power Routing: Connect a stable external 12/24 VDC source to the dedicated DC+ and DC- common pins on the terminal assembly. Route field wiring separate from AC power lines with at least 150 mm spacing to shield the solid-state components from capacitive cross-talk spikes.
Actuator Inductive Suppression: When driving inductive loads such as heavy dc relays, solenoids, or magnetic contactors, install an external suppression diode (such as a 1N4004) directly parallel across the load terminals to arrest reverse emf voltage surges during de-energization.