The 1756-OF4 is an analog output module in the ControlLogix series produced by Allen-Bradley (Rockwell Automation). This module provides 4 voltage or current outputs with high resolution and precise output signal control.

Here are some of the key features of the module:
Output type: Provides four voltage or current outputs.
Current resolution: 15 bits, 650 nA/ bit at 21 mA output.
Voltage resolution: 16 bit, 320 μV/ bit at 10.5V output.
Compatible detachable terminal block: A 20-pin RTB (removable patch board) is required, and compatible RTB models are 1756-TBSH and 1756-TBNH.
Power consumption: The current consumption is 150 mA when operating at 5.1V DC voltage and 120 mA when operating at 24V DC voltage.
Thermal performance: Has good heat dissipation performance, heat dissipation rating of 10.91 BTU/hr.
Load capacity: Capable of driving resistance loads up to 2000 ohms and current loads from 0 to 750 ohms.
Accuracy: Full scale accuracy margin of 0.5% at 25 degrees Celsius and output ripple of +/-0.05% in the 0 to 50 KHZ range.
The 1756-OF4 module is suitable for a variety of industrial automation applications, such as driving actuators such as inverters, controlling valves, valves, shutters, or for forwarding signals to loggers, indicators, data loggers and external controllers. It can also be used to implement control outputs or commands configured in user programs, including PID controllers, mathematical calculations, manual input interfaces, movement, and similar analog processing instructions.

The module is required to be calibrated every 12 months with a calibration accuracy better than 0.05% of the range of 4 to 21 MA, -10.4 to 10.4 volts. It has been routinely tested for 2 seconds at 1350 volts AC and has a sustained isolation voltage of 250 volts. The module has a voltage drive capability greater than 2000 ohms and a current drive capability of 0 to 750 ohms.