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Connecting
6.2 Connecting SITRANS TDL
6.2.10
Passive analog inputs
Passive analog inputs require external power supply for operation. Set analog input dip switch
to P (passive).
Exemplary usage of passive analog input
6.2.11
Digital outputs
SITRANS TDL system provides 4 high side power switch (MOSFET) based digital outputs. Digital
outputs are galvanically isolated from HOST board thus the digital outputs block must be
powered externally (pin 21 and 22, 19-30 VDC). Each output can handle current up to 0.5 A. The
status of each output is displayed on the HOST board with the blue LED in DOUT section. In the
DOUT_PWR section the status of the power supply (green LED -> Power OK, red LED -> Power
NOT OK) can be found.
Key functions elements of the isolated digial output:
• High side power switch (MOSFET) based
• Digital outputs are electrically isolated from HOST board
• Additional 24 VDC power supply required
60
Operating Instructions, 05/2023, A5E51429088_AA
SITRANS TDL
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