Installation Instructions · Publication 1734-IN018 · Rockwell Automation

POINT I/O 1734-OB2/OB4/OB8 Output Modules Installation

This document is the installation instructions for the Allen-Bradley POINT I/O output modules, covering catalog numbers 1734-OB2, 1734-OB4, 1734-OB4K, 1734-OB8, and 1734-OB8K, Series C. It covers mounting base installation, module installation, removable terminal block (RTB) wiring, status indicator interpretation, and electrical and environmental specifications. Conformal coated variants (suffix K) share the same specifications as their non-coated counterparts. The Series C modules work with DeviceNet and PROFIBUS adapters. With Studio 5000 Logix Designer version 20 or later they also work with ControlNet and EtherNet/IP adapters.

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2, 4, or 8 per module Output Channels
10…28.8V DC On-State Voltage Range
1.0 A per channel Max Output Current
-20…+55 Operating Temp Range

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Specifications

Output Module Electrical Specifications

Outputs per module (non-isolated, sourcing) 1734-OB2: 2 (1 group of 2); 1734-OB4/OB4K: 4 (1 group of 4); 1734-OB8/OB8K: 8 (1 group of 8)
On-state voltage range, min 10V DC
On-state voltage range, nom 24V DC
On-state voltage range, max 28.8V DC
On-state voltage drop, max 0.2V DC
On-state current, min per channel 1.0 mA
Off-state leakage, max 0.5 mA @ 28.8V DC
Output signal delay, max (Off to On) 0.1 ms
Output signal delay, max (On to Off) 0.1 ms
Output current rating 1734-OB2: 1.0 A per output, 2.0 A max per module; 1734-OB4/OB4K and 1734-OB8/OB8K: 1.0 A per output, 3.0 A max per module
Surge current 2 A for 10 ms, repeatable every 3 s

General Specifications

Terminal base screw torque 0.8 N•m (7 lb•in)
POINTBus current, max @ 5V DC 75 mA
Power dissipation, max @ 28.8V DC 1734-OB2: 0.8 W; 1734-OB4/OB4K: 1.2 W; 1734-OB8/OB8K: 2.0 W
Thermal dissipation, max @ 28.8V DC 1734-OB2: 2.7 BTU/hr; 1734-OB4/OB4K: 4.1 BTU/hr; 1734-OB8/OB8K: 6.8 BTU/hr
Isolation voltage 50V continuous, reinforced insulation; type tested @ 2500V DC for 60 s, field-side to system
External DC power supply voltage, nom 24V DC
External DC power voltage range 10…28.8V DC
External DC power supply current 1734-OB2: 8 mA; 1734-OB4/OB4K: 16 mA; 1734-OB8/OB8K: 32 mA
Dimensions (H x W x D), approx 56.6 x 12.1 x 77.5 mm (2.23 x 0.48 x 3.05 in.)
Weight, approx 1734-OB2: 32.60 g (1.15 oz); 1734-OB4/OB4K: 33.17 g (1.17 oz); 1734-OB8/OB8K: 35.4 g (1.25 oz)
Enclosure type rating None (open-style)
Wiring category 2, on signal ports

Environmental Specifications

Temperature, operating -20…+55 °C (-4…+131 °F)
Temperature, nonoperating -40…+85 °C (-40…+185 °F)
Relative humidity 5…95% noncondensing
Vibration 5 g @ 10…500 Hz
Shock, operating 30 g
Shock, nonoperating 50 g
ESD immunity 6 kV contact discharges; 8 kV air discharges
Radiated RF immunity 10V/m with 1 kHz sine wave 80% AM from 80…6000 MHz
EFT/B immunity ±2 kV at 5 kHz on power ports; ±2 kV at 5 kHz on signal ports
Surge transient immunity ±1 kV line-line (DM) and ±2 kV line-earth (CM) on signal ports
Conducted RF immunity 10V rms with 1 kHz sine wave 80% AM from 150 kHz…80 MHz

Communication Protocols

Supported industrial networks and field buses for the products covered by this publication.

DeviceNet Compatible with DeviceNet adapters; Series C modules supported PROFIBUS Compatible with PROFIBUS adapters; Series C modules supported ControlNet Supported with Series C modules when using Studio 5000 Logix Designer version 20 or later EtherNet/IP Supported with Series C modules when using Studio 5000 Logix Designer version 20 or later

Certifications & Compliance

c-UL-us: UL Listed Industrial Control Equipment, certified for US and Canada. See UL File E65584. UL Listed for Class I Division 2 Group A,B,C,D Hazardous Locations, certified for U.S. and Canada. See UL File E194810. UK and CE: Compliant with UK Statutory Instrument 2016 No. 1091 and European Union 2014/30/EU EMC Directive; EN 61326-1, EN 61000-6-2, EN 61000-6-4, EN 61131-2 RoHS: Compliant with UK Statutory Instrument 2012 No. 3032 and European Union 2011/65/EU RoHS; EN IEC 63000 RCM: Compliant with Australian Radiocommunications Act; EN 61000-6-4 Ex (ATEX/UKEX): II 3 G Ex ec IIC T4 Gc; DEMKO 04 ATEX 0330347X; UL22UKEX2478X; EN IEC 60079-0; EN IEC 60079-7 KC: Korean Registration of Broadcasting and Communications Equipment; Article 58-2 of Radio Waves Act, Clause 3 Morocco: Arrêté ministériel n° 6404-15 du 29 ramadan 1436 CCC: CNCA-C23-01 CCC Implementation Rule Explosion-Proof Electrical Products; CCC: 2020122309111607 IECEx: IEC 60079-0; IEC 60079-7; II 3 G Ex ec IIC T4 Gc; IECEx UL 20.0072X

Document Contents

Full PDF covers the following topics in detail:

  • Summary of Changes
  • Before You Begin
  • Install the Mounting Base
  • Install the Module
  • Install the Removable Terminal Block
  • Remove a Mounting Base
  • Communicate with the Module
  • Wire the Modules
  • Interpret Status Indicators
  • Specifications
  • Additional Resources

Frequently Asked Questions

Which catalog numbers are covered by this installation document?
This document covers 1734-OB2, 1734-OB4, 1734-OB4K, 1734-OB8, and 1734-OB8K, Series C. Catalog numbers with the suffix 'K' are conformal coated and share the same specifications as the non-conformal coated versions.
Which network adapters are compatible with the Series C POINT I/O output modules?
Series C POINT I/O output modules are compatible with DeviceNet and PROFIBUS adapters. When using Studio 5000 Logix Designer version 20 or later, the Series C modules can also be used with ControlNet and EtherNet/IP adapters.
What is the maximum output current per channel and per module?
All covered modules are rated at 1.0 A per output channel. The 1734-OB2 has a maximum of 2.0 A per module. The 1734-OB4, 1734-OB4K, 1734-OB8, and 1734-OB8K have a maximum of 3.0 A per module. Surge current is 2 A for 10 ms, repeatable every 3 seconds.
What is the operating temperature range for these output modules?
The modules are certified for use within a surrounding air temperature range of -20…+55 °C (-4…+131 °F). The nonoperating temperature range is -40…+85 °C (-40…+185 °F).
How much I/O data does each output module consume on the backplane?
Each POINT I/O output module consumes 1 byte of I/O data (scanner Tx). For the 1734-OB2, bits 0 and 1 control channels 0 and 1. For the 1734-OB4 and 1734-OB4K, bits 0 through 3 control channels 0 through 3. For the 1734-OB8 and 1734-OB8K, bits 0 through 7 control channels 0 through 7.
What do the module status indicator states mean?
Off indicates no power is applied. Steady green means the device is operating normally. Flashing green means the device needs commissioning due to missing, incomplete, or incorrect configuration. Flashing red means the device did not pass the internal test. Steady red indicates an unrecoverable fault requiring device replacement. Flashing red/green means the device is in self-test mode.
What hazardous location approvals do these modules carry?
The modules are UL Listed for Class I Division 2 Groups A, B, C, D Hazardous Locations for the US and Canada. They also carry UKEX/ATEX and IECEx approvals for Zone 2 potentially explosive atmospheres, with protection type Ex ec IIC T4 Gc per EN IEC 60079-0 and EN IEC 60079-7. Reference certificates are DEMKO 04 ATEX 0330347X, UL22UKEX2478X, and IECEx UL 20.0072X.

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