The 1756-OA8D ControlLogix Output Module by Allen-Bradley is an 8-point output ControlLogix Diagnostic module mounted on any slot of the 1756 ControlLogix Chassis. Like most modules in the series, it has back-plane ratings of 175mA at 5.1V DC and 250mA at 24V DC, with a gross backplane rating of 6.9W. Its output voltage ranges between 74 and 132V AC at 47-63Hz and it has a maximum ON/OFF and OFF/ON delay time of 9.3ms at 50Hz and one of 11ms at 50Hz. The 1756-OA8D has a draw current of 175mA at 5.1V and 250mA at 24V and a power dissipation of 53W and a thermal dissipation of 18.0 BTU/hr. In its OFF state, it has a leakage current of 3mA per point and a maximum drop voltage of 3.0V at 1.0A. The current rating on each output point is 1A at 30 0C which linearly de-rates at a temperature higher than this and the net current on the overall module is 8A also at 30 0C and it will also linearly de-rate at any higher temperature value.
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Functional Characteristics
1. Processor control
As a key output module of the ControlLogix system, it supports direct control of the 1756 series controller
Provides 8-channel high-precision analog output (±10V/0-20mA configurable)
Supports direct mapping output of controller data to ensure real-time control performance
2. Modbus master/slave function
Extends Modbus TCP function through communication modules such as 1756-EN2T
Supports as a Modbus slave device to provide analog data reading
Can be configured as a Modbus master to control lower-level devices (additional configuration required)
3. I/O mapping and scanning
Each channel is independently isolated (1500Vrms isolation between channels)
Supports direct conversion of engineering units (such as 0-100% corresponds to 4-20mA)
Configurable output slope limit to prevent sudden shock
4. Programming and debugging
Configure channel parameters through Studio 5000 software
Supports output value forcing and simulation functions
Provides real-time output current/voltage readback verification
Technical specifications
| Part Number/Catalog No. | 1756-OA8D |
| Series | ControlLogix |
| Module Type | Diagnostic AC Output Module |
| Outputs | 8 Diagnostic |
| Voltage | 120 Volts AC |
| Operating Voltage Range | 74-132 Volts AC |
| Maximum Output Current Rating-Point | 1 Amp at 30 degrees Celsius, 0.5 Amps at 60 degrees Celsius |
| Maximum Output Current Rating-Module | 8 Amps at 30 degrees Celsius and 4 Amps at 60 degrees Celsius |
| Power Dissipation (Max) | 5.3 Watts at 60 degrees Celsius |
| Backplane Current at 5 Volts | 175 milliamps |
| Backplane Current at 24 Volts | 250 milliamps |
| Removeable Terminal Block(s) | 1756-TBNH, 1756-TBSH |
| Isolation Voltage | 50 Volts Continuous |
| Enclosure | None |
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