Manufacturer: Rockwell Automation
Brand: Alan Bradley
Part number/Catalog number: Model 1756-OF6CI
Series: ControlLogix
Module type: heterogeneous analog output module with current loop
The Allen-Bradley 1756-OF6CI module is A ControlLogix A Series universal isolated analog current/voltage output module. The module has 6 separate current outputs. It also has a 13-bit resolution of 21 mA (2.7 μA). It requires a 1756-TBNH or 1756-TBSH detachable terminal housing (RTB) before it can be installed in a grounded and mounted case.
The types of communication formats provided by the 1756-OF6CI module include integer and floating point formats. The analog output module features data echo, ramp/rate limit, clamp/limit, clamp/limit alarm, and initialization hold. These programs are a feature of 1756-OF6CI.
It ranges from 0 to 20 mah, with low signal and users at 0 mah and -32,768 counts, and high signal and users at 21.074 mah and count at 32,767. The module has a current consumption of 250 mA at 5.1V voltage, with 0 to 550 ohms terminated at OUT and RTN, and 551 to 1000 ohms terminated at OUT and ALT. At 24V, its current consumption is 225 mA (0 to 550 ohms, terminated at OUT and RTN), and 300 mA (551 to 1000 ohms) terminated at OUT and ALT. The total backplane power is 6.7 W from 0 to 550 ohms and 8.5 W from 551 to 1000 ohms. The module has a maximum power consumption of 5.5 W at loads of 0 to 550 ohms and 6.1 W at loads of 551 to 1000 ohms. It has no open circuit detection, but has 24V DC overvoltage protection and short circuit protection limited to 21 mA or less. The conventional test at 1350V AC for 2 seconds has a continuous isolation voltage of 250V.
The 1756-OF6CI module has a maximum module scan time of 10 ms in integer format and 25 ms in floating point format, with a module error of 0.6% of the range. Under resistic load, its establishment time is less than 2 ms to 95% of the final value, the calibration interval is 6 months, and the calibration accuracy is better than 0.1% of 4 to 21 mA (at 25 degrees Celsius). The nominal gain drift with temperature is 60 ppm per degree Celsius, and the maximum gain drift with temperature is 100 ppm per degree Celsius.
