Allen Bradley 1769-OF8C CompactLogix 8 Channel Analog Current Output I-O Module.

The Allen-Bradley 1769-OF8C is Compact I/O module. This module is compatible for use with the 1769 and some 1768 CompactLogix controllers as well as with the MicroLogix 1500 controllers.

This module is an analog output module, typically used for driving Final Control Elements (FCE) of a control loop as well as deliver signals to receiving and measuring elements.

The 1769-OF8C mainly features Eight (8) Single-ended current output channels, configurable for 0-20 mA and 4-20 mA. It features 16-bit Digital to Analog Converter (DAC), with specific resolution of 15.59 bits, 0.323 µA/bit for 4-20 mA and 15.91 bits, 0.323 µA/bit for 0-20 mA. It has a conversion rate of 5ms on all channels and step response to 63% output of less than 2.9 ms. The analog output range is 0-21 mA and 3.2-21 mA.

Typical Final Control Elements (FCE) that can be driven by the 1769-OF8C are Modulating Control Valves, Variable Frequency Drives (VFD), Positioners and other devices. To be used in automatic control loop, this module may be integrated to a Proportional + Integral + Derivative (PID) controller that is embedded within the processor. Compatible receiving and measuring elements that can receive signal from this device are panel meters, data loggers, signal splitters and other similar type of devices.

The 1769-OF8C is a single width module, that can be installed along the 1769 and 1768 CompactLogix assembly as local I/O and part of the expansion I/O rack. It may also be used with MicroLogix 1500 controller.

The Allen-Bradley 1769-OF8C can support up to 8 channels of simultaneous analog current output. On the front side of the module, there is one LED indicator that energizes Green when the module is not experiencing problems. This status LED light can warn the users if it detects an open-loop condition. The module also has overcurrent and overvoltage protection features. The 1769-OF8C Compact Logix series current output module requires a 24 Volts DC rated external power supply and it includes channel-to-earth ground isolation. All of the outputs have a 16-bit resolution. The 1769-OF8C output module includes an integral removable terminal block with finger-safe protection for the wiring to the actuators. This terminal block can be found behind a door at the front of the output module. The most common way of wiring this module is by routing it from beneath the module to the output terminals. The 1769-OF8C also has a replacement door kit and it uses a solid copper wire with a 22 by 14 AWG size. The output impedance for the 1769-OF8C is more than 1 Ohm and it is protected from short-circuiting. The module is built to operate at a temperature range of 0 to 60 degrees Celsius. Its accuracy at 25 degrees Celsius is ±0.35% of the full scale. The 1769-OF8C is shipped with an approximate weight of 0.28 kilograms, and it measures 4.65 inches x 1.38 inches x 3.43 inches.

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