中文版
Description
The Allen-Bradley 1756-OF4 module is a ControlLogix non-isolated output module. It
has 4 voltage or current outputs available with a current resolution of 15 bits across 21 mA,
650 nA/bit for a voltage resolution of 16 bits across 10.5V, 320 µV/bit. It requires a 20 pin RTB,
or Removable Terminal Block housing for connection to field devices. The compatible RTBs are the
1756-TBSH and the 1756-TBNH. It is important to ensure that the chassis and power supply have already been installed and grounded prior to installing the module to it with the RTB.
This output module features a rolling timestamp of data, Removal and Insertion Under Power (RIUP),
onboard features, module resolution, producer/consumer communication, and multiple data formats. Data
formats available for this module are floating-point mode and integer mode. This module can also multicast fault data and status to the owner-listening controller using the channel data.
The 1756-OF4 module has voltage and current ratings of 5.1V DC for the backplane, a maximum of 150 milliamps for
24V DC. It has a current draw of 150 milliamps at 5.1V and 120 milliamps at 24V and a total backplane power of 5.8 W. Its
power consumption is 3.7 W of backplane power and its overvoltage protection is 24V DC. The module’s open circuit detection
is only for current output, but the output should be set to greater than 0.1 milliamps. It also has a short-circuit protection that is limited to 21 milliamps or less.
With an output range of 0 to 20 milliamps, it has a low signal and user count of 0 milliamps and -32768 counts and a high
signal and user count of 21.2916 milliamps and 32767 counts respectively. At an output range of +/- 10V, the module’s low
signal and user count are -10.4336V and -32768 counts and the high signal and user count are 10.4336V and 32676 counts
respectively. It has been routine-tested for 2 seconds at 1350V AC and has a continuous isolation voltage of 250V.
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