Rockwell Automation 1395 Discrete Adapter, Rev 3.XX-8.XX - Manual (Page 26)

Chapter 5
StartĆUp
5-3
S The example shows two analog inputs connected to Parameters 400 and
401. In addition, these parameters are linked to drive Parameters 154 and
157 respectively. When an analog input is applied to analog input # 1,
the signal is converted to a digital value and directed to Parameter 401.
Since Parameter 401 is linked to Parameter 154 the digital value is
directly transferred to Parameter 154 (External Velocity Ref). The same
applies to all other analog inputs.
S For the case of analog outputs and digital outputs, the information
transfer is handled in the same manner. However, data is passed from the
drive to the Discrete Adapter Board.
In all cases it is important to note that once a configuration link is
established, data is transferred between the linked parameters
automatically. Nothing further needs to be done.
Digital Input/Output SetĆUp
The Digital Inputs and Outputs are provided to allow discrete signals to
control drive operation.
Each input can be set-up to control a specific bit in the Discrete Adapter
logic parameter. The Discrete Adapter logic parameter is a Port Sensitive
number (Parameter 400 in
Figure 5.1 ). Parameters 583 through 586 control
which bit in the logic parameter is controlled by each digital input.
Digital outputs are setup similar to digital inputs with the exception that
Parameters 558 and 559 control the mapping of the outputs.
Analog Input/Output SetĆUp
The analog I/O requires more extensive set-up than the digital I/O. You
must adjust Scale and Offset parameters for each discrete analog device.
Also, each device has a specific Variable parameter, which you must link to
a Drive Variable parameter to transfer information. An example for both
analog input and output devices follows:
The drive works with internal drive units. Every parameter entered into the
drive is internally converted to these units. Each parameter is a 16 bit word,
which allows a range of
±
32767 internal units. The drive is scaled so that
4096 is equal to one unit of the quantity being regulated. A
±
10V DC
signal applied to an analog input is converted to a digital value of
±
2048,
providing a total range of 4096. When calibrating analog inputs, a scale
factor is applied to this value, to provide an effective range of
±
32767 (16
times 2048). The offset parameter determines the offset in volts, applied to
the raw analog value before the scale factor is applied. This allows you to
shift the range of the analog input by
±
4096.