BECKHOFF KL3041 - Manual (Page 8)

Functional description
6 KL304x and KL305x
Functional description
The analog input terminals
- KL304x process signals in the range between 0 and 20 mA
- KL305x process signals in the range between 4 and 20 mA
with a resolution of 12 bits (4095 increments). They can supply the sensors
from voltage fed in via the power contacts. The power contacts can
optionally be supplied via the standard supply or via a feed terminal with
electrical isolation.
Process data output format In the delivery state the process data are shown in two's complement form
(integer -1 corresponds to 0xFFFF). Other display types can be selected
via the feature register (e.g. sign/amount representation, Siemens output
format).
Measured value Output
KL304x KL305x Decimal Hexadecimal
0 mA 4 mA 0 0x0000
10 mA 12 mA 16383 0x3FFF
20 mA 20 mA 32767 0x7FFF
LED display
The LEDs indicate the operating state of the associated terminal channels.
Green LED: RUN (not applicable for KL3044 and KL3054)
• On: normal operation
• Off: Watchdog-timer overflow has occurred. If no process data is
transmitted to the bus coupler for 100 ms, the green LEDs go out.
Red LED: ERROR
• On: The limit stop of the A/D converter has been reached. The
current is greater than 21.5 mA.
• Off: normal operation