Functioning IP/IE4112
The analog output module generates output signals in the range from 0...20 mA. The module supplies the output current with a resolution of up to 16 bits.
|
Process data (hex) |
Process data (decimal) |
Output value |
|---|---|---|
|
0x0000 |
0 |
0 mA |
|
0x3FFF |
16383 |
10 mA |
|
0x7FFF |
32767 |
20 mA |
As from software version 2 (see Appendix) it is also possible to set a range from 4...20 mA in register 32 (bit 5 = 1). This setting in the feature register of the first channel then applies to all channels, and cannot be set separately for each channel.
|
Process data (hex) |
Process data (decimal) |
Output value |
|---|---|---|
|
0x0000 |
0 |
4 mA |
|
0x3FFF |
16383 |
12 mA |
|
0x7FFF |
32767 |
20 mA |
Representation corresponds to the integer number format (INT). The default setting is for the process data to be entered in twos complement (-1 corresponds to 0xFFFF).
Process data
The process data written by the controller is output as
follows:
x = PLC process data (D0, D1)
B_a, A_a = manufacturer scaling (registers 17, 18)
B_h, A_h = manufacturer scaling (registers 19, 20)
B_w, A_w = user scaling (registers 33, 34)
Y_dac = output value to the D/A converter
Neither user nor manufacturer scaling are active
Y_0 = B_a + A_a * x
Y_dac = Y_0
Manufacturer scaling active (default)
Y_1 = B_h + A_h * Y_0
Y_dac = Y_1
User scaling active
Y_2 = B_w + A_w * Y_0
Y_dac = Y_2
Manufacturer and user scaling active
Y_1 = B_h + A_h *Y_0
Y_dac = B_w + A_w * Y_1
The linear equations are activated via register 32.
Conceptual circuit diagram
