1756-OF4 Allen-Bradley Analog output module

Description

1756-OF4 Allen-Bradley Analog output module

The Allen-Bradley 1756-OF4 module is the ControlLogix non-isolated output module. It provides four voltage or current outputs with current resolution of 15 bit, 21 mA, 650 nA/ bit, and voltage resolution of 16 bit, 10.5V, 320V/ bit. It requires a 20-pin RTB, or removable junction box housing, for connecting field equipment. Compatible RTBS are 1756-TBSH and 1756-TBNH. Before using RTB to install a module into the chassis and power supply, ensure that the chassis and power supply have been installed and grounded.

The output module has rolling time stamps of data, power off remove and insert (RIUP), onboard functionality, module resolution, producer/consumer communication, and multiple data formats. The data formats available for this module are floating-point and integer modes. The module can also use channel data to listen to the owner for controller multicast failure data and status.

The backplane of the 1756-OF4 module has a voltage and current rating of 5.1V DC and a maximum of 150 mA for 24V DC. It has a current consumption of 150 mah at 5.1V and 120 mah at 24V for a total backplane power of 5.8W. It has a power consumption of 3.7 W backplane power and an overvoltage protection of 24V DC. The open circuit detection of the module is only for the current output, but the output should be set to greater than 0.1 mA. It also has short circuit protection limited to 21 mah or less.

Output ranges are 0 to 20 mah, 0 mah and -32768 for low signal and user counts, and 21.2916 mah and 32767 for high signal and user counts. In the output range of +/ -10V, the low signal and user count of the module are -10.4336V and -32768, and the high signal and user count are 10.4336V and 32676, respectively. It has been routinely tested for 2 seconds at 1350 volts AC and has a continuous isolation voltage of 250 volts.

The module has a voltage drive capacity of over 2000 ohms and a current drive capacity of 0 to 750 ohms. The floating point module scan time is 12 ms, the integer scan time is 8 ms, the module error is 0.15% of the voltage range and 0.3% of the current range. For resistive loads, 95% of the final value takes less than 2 ms to establish. It has a maximum power consumption of 3.25W (4-channel current) and a heat dissipation of 10.91 BTU/hr.

Allen-Bradley 1756-OF4 is an analog output module capable of providing analog voltage and current signals. These output signals can be used to drive modulation devices and actuators, or to forward signals for use by loggers, indicators, data loggers and external controllers.

The module has an output voltage signal of +/ 10 VDC or 4-20 mA with 15-bit (10.5V, 320V/ bit) and 15-bit (21 mA, 650 nA/ bit) resolutions. Using R-trapezoidal DAC, monotony code – free conversion method. When configured as floating-point, the module scan time is 12 milliseconds versus 8 milliseconds for integers.

Analog output modules are commonly used for modulating actuators and devices such as variable frequency drivers (VFD), modulation control valves, damper, shutters, and other actuators. It is usually used to implement control outputs or commands configured in a user program. Such user programs can include proportional-integral-differential (PID) controllers, mathematical calculations, manual input interfaces, movement, and similar analog processing instructions.

Loggers, indicators, and data loggers can also use analog outputs. It can also be used to connect external controllers as remote set points to become part of more advanced control policies, such as cascade, feedforward, and other control policies using more than two (2) process variables.

The module is required to be calibrated every 12 months with an accuracy of better than 0.05% of the 4 to 21 MA, -10.4 to 10.4 volt range

This article is from the official website of Zhangzhou Branch of Xiamen Xiongba E-commerce Co., LTD. Please attach this link: http://www.sauldcs.com/

1756-OF4

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