1791-OB16 Block I/O Remote I/O Module

The Allen‑Bradley 1791-OB16 is a discontinued 16-point sourcing DC output Block I/O module designed for Remote I/O (RIO) networks with PLC‑5 and SLC 500 controllers. It provides 24 VDC sourcing digital outputs rated 0.5 A per channel, supporting solenoids, indicators and small contactors. Featuring electrical isolation between field circuits and control logic, it supports DIN rail or panel mounting. Widely deployed for distributed discrete control on legacy assembly lines, material handling and packaging equipment.

Specification

Brand/Manufacturer: SIEMENS

Status: Available

Series: ALLEN-BRADLEY

Place of Origin: Made in USA

Alternate PN: 1791OB16

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Product Specification

Warranty & Delivery

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Sell Your Surplus

Item	Specification
Part Number	1791-OB16
Brand & Series	Allen‑Bradley / Rockwell Automation Bulletin 1791 Block I/O Remote I/O Module
Module Type	16-point DC Sourcing Digital Output Block
Communication Interface	Remote I/O (RIO) link for PLC‑5, SLC 500 controllers
Number of Outputs	16 discrete outputs, arranged in two groups of 8
Output Type	Sourcing (PNP) DC output
Rated Output Voltage	10…30 VDC (nominal 24 VDC)
Per-point Continuous Current	0.5 A maximum per channel
Surge Current Capacity	3 A for 10 ms maximum per output
Minimum Load Current	15 mA per output
Maximum On-state Voltage Drop	1.5 V @25 °C
Off-state Leakage Current	≤0.5 mA per point
Signal Delay	Turn-on ≤0.5 ms; Turn-off ≤1.0 ms
Isolation	I/O circuit isolated from RIO communication circuit
Mounting	DIN rail or panel mounting
Operating Temperature	0 °C ~ +55 °C
Storage Temperature	-40 °C ~ +85 °C
Relative Humidity	5–95 % RH, non‑condensing
Dimensions (H × W × D)	176.5 × 68.8 × 98 mm
Approximate Weight	1.0 kg
Product Status	Discontinued legacy remote block I/O

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