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Allen-Bradley 1756-OB8 ControlLogix Digital DC 8 Output Module 24VDC

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Allen-Bradley 1756-OB8 ControlLogix Digital DC 8 Output Module 24VDC

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Brand Name :	Allen-Bradley
Model Number :	1756-OB8
Certification :	CE
Price :	USD
Payment Terms :	T/T
Supply Ability :	10EA
Delivery Time :	5-8 WORKING DAYS

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Allen-Bradley 1756-OB8 ControlLogix Digital DC 8 Output Module 24VDC

About 1756-OB8

The Allen-Bradley 1756-OB8 is a ControlLogix discrete output module. This module delivers an ouput voltage range of 10-30 VDC with nominal value of 24VDC. It is used to energize electrical loads that operate in DC voltages as well as AC loads, used with an interposing circuitry.

The 1756-OB8 is a single slot module that occupies any available slot of the chassis except the left-most slot which is intended for the ControlLogix processor or ControlLogix communication adapter / scanner module. It is compatible acting as a local I/O component or as part of a distributed I/O system. It may be installed to any available 1756- ControlLogix chassis and operate along standard or power supply modules.

The 1756-OB8 has a backplane current draw of 165 mA at 5.1 VDC and 2 mA at 24VDC while the total backplane power is 0.89 W and power dissipation of 2.5 W @ 60 °C (140 °F) and thermal dissipation of 8.53 BTU/hr. Each channel of this output module can deliver up to 2 Amperes @ 60 °C (140 °F) and 8 Amperes @ 60 °C (140 °F) per module.

This module uses a Removable Terminal Block (RTB) for connecting each channel of the module to the electrical loads. Compatible RTBs are 1756-TBNH and 1756-TBSH while appropriate RTB keying is user-defined, mechanical keying.

It is entered in the hardware configuration where module parameters and properties can be further modified/ Some of these parameters are Request Packet Interval (RPI), filter time, module inhibition and many others.

This module uses a Removable Terminal Block (RTB) which can either be the 1756-TBNH or the 1756-TBSH (20 pins RTB). This module has the following communication formats available: rack optimization, listen-only - rack optimization, output data, listen-only output data, and scheduled output data. Pilot duty is also available for the 1756-OB8 module.

The 1756-OB8 module has a voltage category of 12/24 volts DC source and an operating range of 10 to 30 volts DC. Its current draw is 165 mA at 5.1V and 2 mA at 24V. It has a backplane power of 0.89 W, with a maximum dissipation of 2.5 W at 60 Degrees Celsius (140 degrees Fahrenheit), and a thermal dissipation of 8.53 BTU/hr. The maximum off-state leakage current of this module is 1 mA per point and during an on-state, it has a maximum voltage drop of 1.2V DC at 2 A. It also has a maximum current of 2 A per point at 60 Degrees Celsius and a maximum current of 8 A at 60 Degrees Celsius per module. Its surge current per point is 4 A for 10 ms each that is repeatable every 1 s at 60 Degrees Celsius and its minimum load current is 2 mA per point. The module's isolation voltage is continuous at 250V. This module also allows you to modify states in Fault Mode per point and states in Program Mode per point. The choices for both are Hold Last State, On, or Off, with 'Off' set as default. Temperature ranges for the 1756-OB8 module are 0 to 60 Degrees Celsius when in operation and -40 to 85 Degrees Celsius when not in operation. It also has a maximum surrounding air temperature of 60 Degrees Celsius and a non-condensing relative humidity of 5% to 95%.

FAQ for 1756-OB8

How many output channels does the 1756-OB8 have?

The 1756-OB8 has Eight (8) Output channels that delivers a nominal output voltage of 24VDC.

Does the module come with an internal fusing?

No. Internal fusing is not built-in to this module.

How many chassis slots does the 1756-OB8 occupy?

The 1756-OB8 only occupies a single slot of the chassis.

Technical Description of 1756-OB8

Allen Bradley ControlLogix DC Output Module with 8-Point Outputs

Technical Specifications for 1756-OB8

Manufacturer	Rockwell Automation
Brand	Allen-Bradley
Signal Delay, OFF Transition	2 ms max
Signal Delay, ON transition	1 ms max
Current per module, max	8 A @ 60 °C (140 °F)
Current per point	2 A @ 60 °C (140 °F)
No. of channels per group:	Four (2)
No. of output groups:	Two (2)
Output Voltage range	10-30VDC
Output Voltage	24VDC
No. of Outputs	Eight (8)
Backplane Current, 5.1VDC	165 mA
Backplane Current, 24VDC	2 mA
Total Backplane power	0.89 W
Part Number/Catalog No.	1756-OB8

Series	ControlLogix
Module Type	Digital DC output module
Removable Terminal Block (RTB)	1756-TBNH 1756-TBSH
Outputs	8-Point
Voltage	12-24 Volts DC Source
Operating Voltage Range	10-30 Volts DC
Maximum Output Current Rating-Point	2 Amps at 60 degrees Celsius
Maximum Output Current Rating-Module	8 Amps at 60 degrees Celsius
Power Dissipation (Max)	2.5 Watts at 60 Celsius
Removeable Terminal Block(s)	1756-TBNH, 1756-TBSH
Isolation Voltage	50 Volts Continuous
Enclosure	None
UPC	10612598171412
UPC	10662468702994

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