1756-OB8EI: Digital DC Sourcing Output
The 1756-OB8EI is the Digital DC Sourcing Output covered on this page. The attribute that decides whether it fits the existing installation without modification is 12-24 Volts DC.
The reason to specify this exact variant is digital dc sourcing output. A processor or controller is selected on memory, scan time and platform compatibility before anything else. digital dc sourcing output sets how much programme fits, how fast the logic executes and which I/O and networks the unit can host — the three things that decide whether an existing application migrates without a rewrite. Confirming 12-24 Volts DC against the installed controller family is the check that prevents a processor that boots but cannot run the existing project.
| Feature | Specification |
|---|---|
| Manufacturer | Rockwell Automation |
| Brand | Allen-Bradley |
| Part Number | 1756-OB8EI |
| Module Type | Digital DC Sourcing Output |
| Series | ControlLogix |
| Part Number | 1756-OB8EI |
| No. of outputs | Eight (8) Electronically-fused, individually isolated channels |
| Output Voltage | 24VDC |
| Output Voltage range | 10-30VDC |
| Output Current per channel, nom. | 2 A @ 60 °C (140 °F) |
| Output Current per module, max. | 10 A @ 60 °C (140 °F) |
| Backplane Current, 5.1VDC | 250 mA |
| Backplane Current, 24VDC | 2 mA |
| Power Dissipation | 4.7 W @ 60 °C (140 °F) |
| Output Signal delay, OFF to ON | 1 ms, max |
| Output Signal delay, ON to OFF | 5 ms max |
| Enclosure type rating | None (open-style) |
| Removable Terminal Block | 1756-TBCH |
| Outputs | 8-Point Individually Isolated, Electronically Fused |
| Voltage | 12-24 Volts DC |
| Operating Voltage Range | 10-30 Volts DC |
| Maximum Output Current Rating-Point | 2 Amps at 60 degrees Celsius |
| Maximum Output Current Rating-Module | 16 Amps at 55 degrees Celsius, 10 Amps at 60 Celsius |
| Power Dissipation (Max) | 4.7 Watts at 60 Celsius |
| Backplane Current at 5 Volts | 250 milliamps |
| Removeable Terminal Block(s) | 1756-TBCH, 1756-TBS6H |
| Isolation Voltage | 50 Volts Continuous |
| Enclosure | None |
Related Configurations
Other published configurations in the same family — confirm the distinguishing specification against your installation:
| Related Part Number | Configuration Difference |
|---|---|
| allen-bradley-1756-ob8-controllogix-24vdc-8-channel-digital-output-module | confirm the configuration against your installation |
| allen-bradley-1756-ob8i-controllogix-isolated-dc-output-module | confirm the configuration against your installation |
Availability & Condition at AutoDCSTech
| Part Number | 1756-OB8EI |
|---|---|
| Availability | In Stock |
| Condition | New |
| Warranty | One Year |
| Origin | US |
