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Wire a field device to the appropriate terminals (refer to the individual wiring diagrams/field connector drawings for that particular I/O module) on either the AS-8534-000 low density connector, or AS-8535-000 high density connector, (refer to the Specification section for your particular I/O module to determine which connector is required.)
User connections are made to a standard screw terminal strip. The rigid wiring system permits module insertion or removal without disturbing the wiring. The connector is an AS-8535-000.
The B872 accepts data values ranging from 0000 to 4095 and converts them into output currents of 4 to 20 mA. The output current is directly proportional to the data value plus 4 mA. Refer to the figure below for a data value to output conversion chart.
Characteristics The B872-100 4-channel analog output module converts numerical data ranging from 0000 to 4095 into current ranging from 4 to 20 mA with 12-bit resolution. The module is designed to control the state of each output channel when the PLC is reset or stopped. The output of the channel can either remain at the last value (hold) or return to zero (RTZ). You can select the hold or RTZ option for each of the 4 isolated outputs using a 4- position DIP switch. A switch is associated with each output (switch 1 for output 1, etc.). z The RTZ function brings the outputs to 0.0 mA as a safety feature z The hold function maintains the last valid output value after the loss of OURBUS communication NOTE: Module Output Alert RTZ disables the output of the module so that output current goes to 0.0 mA, not to zero scale (4 mA). Monitor voltage goes below 1V to indicate an output current loss of less than 4 mA. The module has four isolated analog outputs, and is capable of updates to all four channels every 1 ms. The 12-bit resolution and the absolute accuracy of +/-0.1% at 25 ° C provides precise control of your application. The following figure shows the simplified schematic of the B872-100 module.
To determine either the data value or the output current, use the following calculations: To solve for output current: Current = (Data Value / 256) + 4 For example: Current = (3162 / 256) + 4 Current = (12.35156) + 4 Current = 16.35156 Current = 16.352 To solve for data value: Data Value = (Current - 4) x 256 For example: Data Value = (10.402 - 4) x 256 Data Value = (6.402) x 256 Data Value = 1638.912 Data Value = 1639 NOTE: Data values larger than 4095 will result in currents less than 20 mA. Refer to the in this chapter. The equations above are valid for data values of 0-4095 only. The module can output values in the range of 4096-8191 in a offset scale. If you use this offset range, be sure to subtract 4096 from the calculations provided above.Trim-Pots Location and Voltmeter Connections, page 59