Allen Bradley PLC 1734-1E8C

Main Product Series – Function & Application Comparison

Typical Applications & Industries:
✓ Industrial machine control and automation ✓ Packaging and material handling
✓ Process monitoring and control ✓ Safety systems (POINT Guard I/O)
✓ Remote device panels and local control cabinets ✓ OEM equipment integration

Detailed Description – Allen‑Bradley 1734 POINT I/O™ Platform

1. Series Overview – Modular Distributed I/O Platform

The Bulletin 1734 POINT I/O™ family is a modular, distributed I/O platform from Allen‑Bradley, ideal for applications where flexibility and low cost of ownership are key . As part of Rockwell Automation’s Integrated Architecture®, POINT I/O provides comprehensive channel‑level diagnostics and configurable features that make it easy to apply across any automation system .

Key Family Features:

• ✓ Modular design – Independent selection of I/O, termination style, and network interface, with 1–8 points per module to minimize system cost and size 

• ✓ Flexible system architecture – Up to 504 channels on a single network interface 

• ✓ Easier installation and maintenance – Modules slide together for easy installation and removal; removable termination system accelerates commissioning 

• ✓ Removal and Insertion Under Power (RIUP) – Replace modules while the system is in operation, reducing downtime 

• ✓ Mix standard and safety I/O – POINT Guard I/O can be used in the same system as standard I/O 

• ✓ Multiple network connectivity – EtherNet/IP (linear, star, ring), ControlNet, DeviceNet, PROFIBUS 

• ✓ Horizontal or vertical mounting – No derating required for orientation 

• ✓ Conformal coating available – Protects against harsh environments 

• ✓ Auto Device Replacement (ADR) – Reduces downtime by automatically replacing device parameters 

• ✓ Studio 5000 Logix Designer® integration – Add‑on‑Profiles provide smooth system integration 

2. Digital I/O Modules – Discrete Control

POINT I/O digital modules offer a wide variety of input, output, and relay modules for discrete control applications .

Digital Input Modules:

• ✓ Voltage options: 24V DC (sinking/sourcing), 120V AC, 220V AC 

• ✓ Point density: 2, 4, or 8 inputs per module 

• ✓ Input delay: Programmable filters (0–65 ms) for noise immunity 

• ✓ Diagnostics: Wire-off and short-circuit detection on select modules 

Digital Output Modules:

• ✓ Output types: Sourcing (24V DC), relay (AC/DC), and protected outputs with electronic fuse protection 

• ✓ Point density: 2, 4, or 8 outputs per module 

• ✓ Output current: Up to 2.0 A per module (1.0 A per channel) 

• ✓ Diagnostics: Point‑level output fault states, short‑circuit diagnostics on select modules 

Configurable Modules (1734‑8CFGDLX):

• ✓ Self‑configuring – Each point can be configured as DC input or output 

• ✓ DeviceLogix™ Smart Component Technology – Embedded logic‑solving capability within the module, enabling autonomous control distribution 

• ✓ Peer‑enabled operation – Supports “Auto Produce” data creation without a master unit 

Example Models:

• 1734‑IB8 – 8‑point 24V DC sinking input module

• 1734‑OB8 – 8‑point 24V DC sourcing output module

• 1734‑OW4 – 4‑point relay output module (AC/DC)

• 1734‑IA4 – 4‑point 120V AC input module 

• 1734‑OA4 – 4‑point 120/220V AC output module 

3. Analog I/O Modules – Process Signal Processing

POINT I/O analog modules provide high‑accuracy signal conversion for process monitoring and control applications .

Analog Input Modules:

• ✓ Signal types: Voltage (0–10V, ±10V) and current (4–20mA) 

• ✓ Resolution: Up to 15 bits 

• ✓ Configurable channels: Individually configurable, on‑board scaling, selectable filters 

• ✓ Diagnostics: Over‑ and under‑range detection 

Analog Output Modules:

• ✓ Signal types: Voltage (0–10V, ±10V) and current (4–20mA) 

• ✓ Resolution: 14 bits (13 + sign) 

• ✓ Accuracy: 0.1% Full Scale @ 25°C 

Thermal Modules:

• ✓ Thermocouple (1734‑IT2I) – Direct thermocouple input with cold‑junction compensation 

• ✓ RTD (1734‑IR2) – Direct RTD input module 

Example Models:

• 1734‑IE2V – 2‑channel analog voltage input module, ±10V, 15‑bit resolution 

• 1734‑IE4C – 4‑channel analog current input module

• 1734‑OE2V – 2‑channel analog voltage output module, ±10V, 14‑bit resolution 

• 1734‑IR2 – 2‑channel RTD input module 

4. Specialty Modules – Advanced Functionality

POINT I/O includes a range of specialty modules for advanced control and communication requirements .

Counter/Encoder Modules:

• ✓ 1734‑VHSC – Very high‑speed counter module for pulse counting and encoder feedback

• ✓ 1734‑IJ – Incremental encoder interface module (24V DC)

• ✓ 1734‑IK – Incremental encoder interface module (5V DC)

• ✓ 1734‑SSI – Synchronous Serial Interface absolute encoder module 

Serial Interface Modules:

• ✓ 1734‑232ASC – RS‑232 ASCII interface module

• ✓ 1734‑485ASC – RS‑485/422 ASCII interface module 

IO‑Link Master:

• ✓ 1734‑4IOL – 4‑channel IO‑Link master module, supports connection to IO‑Link enabled devices 

Address Reserve Module:

• ✓ 1734‑ARM – Address Reserve Module for system redundancy 

5. POINT Guard Safety I/O Modules

POINT Guard I/O provides safety‑rated input/output modules that can be mixed with standard I/O in the same POINT I/O system .

Key Features:

• ✓ Safety rating: Achieves SIL3, Cat.4, PLe

• ✓ Point density: 1–8 points per module

• ✓ Diagnostics: Built‑in safety diagnostics for high‑availability systems

• ✓ Mixed with standard I/O: Allows standardization regardless of application requirements 

Example Models:

• 1734‑IB8S – 8‑point safety input module

• 1734‑OB8S – 8‑point safety output module 

6. Communication Adapters – Network Connectivity

POINT I/O communication adapters provide the network interface for the I/O system .

EtherNet/IP Adapters:

• ✓ 1734‑AENT – Standard EtherNet/IP adapter 

• ✓ 1734‑AENTR – Dual‑port EtherNet/IP adapter for ring/linear topology 

Other Network Adapters:

• ✓ 1734‑ADN(X) – DeviceNet adapter 

• ✓ 1734‑ACNR – ControlNet adapter with redundancy support 

• ✓ 1734‑APB – PROFIBUS adapter 

Features:

• ✓ Linear, star, and ring EtherNet/IP network topologies supported 

• ✓ Auto‑address, auto‑baud, and power functions compliant with POINTBus backplane 

• ✓ Removal and Insertion Under Power (RIUP) support 

7. Terminal Bases & Accessories

POINT I/O modules mount on terminal base units that provide field wiring termination and system power connection .

Terminal Base Options:

• ✓ 1734‑TB / 1734‑TBS – 8‑point terminal base with removable screw or spring terminals 

• ✓ 1734‑TOP / 1734‑TOPS – One‑piece 8‑point terminal base with screw or spring terminals 

• ✓ 1734‑TB3 / 1734‑TB3S – 12‑point terminal base with screw or spring terminals

• ✓ 1734‑TBJC – Terminal base with cold‑junction compensation for thermocouple modules 

Power Supplies:

• ✓ 1734‑EP24DC – 24V DC power extension module

• ✓ 1734‑FPD – Field power distribution module 

Other Accessories:

• ✓ 1734‑CTM – Common terminal module

• ✓ 1734‑VTM – Voltage terminal module

Selection Guide – Understanding the Naming Convention (1734 POINT I/O™)

Part Number Format: 1734‑[Function][Type][Density][Suffix]

Density Code (Number of Points):

• 2 = 2 channels

• 4 = 4 channels

• 8 = 8 channels

Suffix Codes:

• D = With diagnostics

• E = With electronic fuse protection

• S = Safety‑rated (POINT Guard)

• DLX = With DeviceLogix™ technology 

Model Decoder Examples: