Basic function principles
The analog output terminals
- KL4011 and KL4012 generate signals in the range 0 mA to 20 mA,
- KL4021 and KL4022 generate signals in the range 4 mA to 20 mA,
with a resolution of 12 bits (4095 steps). The output voltage is output electrically isolated from the K-bus.
The supply voltage fed in via the power contacts is used for generating the output current.
The LEDs indicate the operating state of the associated terminal channels.
- green Run LED:
- On: Normal operation
- Off: Watchdog timer overflow has occurred. If no process data are transmitted by the Bus Coupler for 100 ms, the green LEDs go out. The output assumes a user-specified voltage (see Feature register).
Process data input format
In the delivery state the process data are shown in two's complement form (integer -1 corresponds to 0xFFFF). Alternative presentation types can be selected via the feature register (R32).
Output current | Process data | ||
|---|---|---|---|
KL4011, KL4012 | KL4021, KL4022 | dec | hex |
0 mA | 4 mA | 0 | 0x0000 |
10 mA | 12 mA | 16383 | 0x3FFF |
20 mA | 20 mA | 32767 | 0x7FFF |
Process data
The process data arriving from the Bus Coupler are output to the process:
Y_dac = X | (1.0) | Neither user nor manufacturer scaling is active. |
Y_1 = B_h + A_h * X | (1.1) | Manufacturer scaling active |
Y_2 = B_w + A_w * X | (1.2) | User scaling active |
Y_1 = B_h + A_h * X | (1.3) | Manufacturer and user scaling active |