Beckhoff KL2521 Series, Документация

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Mounting and wiring
KL2521 22 Version: 2.1
Connecting the inputs (KL2521-0000, KL2521-0024)
The optically isolated inputs are protected from overload by a current limiter. Without further external circuitry
the operating voltage may lies between 5 V and 24 V
DC
. The GND connection is the common ground for the
two inputs, T and Z. The circuit diagram shows the internal circuitry of the two inputs:
Fig. 12: Internal circuit of the inputs T and Z
Connection of the outputs
Circuit examples for output to A. The same principles apply to output B.
KL2521-0000, KL2521-0010
The outputs A and B of the EL2521 can be used in different connection modes. An integrated DC/DC
converter supplies the output stage of the two channels, A and B, with an electrically isolated 5 V power
supply.
• Connection to RS485/RS232 receiver
The output can be operated as RS485 or as RS232 output. The circuit generates the necessary
differential signals.
Fig. 13: KL2521-0000 on the RS485/RS232 receiver
• Connection to optocoupler (without external supply voltage )
The outputs can be used for direct connection of an optocoupler. The output stage supplies the
necessary output current using an internal 5 V supply voltage.
Fig. 14: EL2521-0000, direct connection to an optocoupler