July 2022
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34
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Connection of external components
Input 2 (Input 2) Connection of a switch Error RESET
It is possible to cancel analyses in progress or delete error messages from an external switch.
This can be a potential-free switch or the relay output of a PLC control or control room.
An auxiliary voltage of 24 VDC at terminal 28 and GND at terminal 30 is available for the
electronics. For signal detection, 24 VDC must be bridged to terminal 29. No external voltage
sources may be connected to the input. If necessary, a potential separation must be made with a
relay or optocoupler.
Programming: no programming required for input 2 / Input 2
Reagent lamp/horn
An reagent light or horn can be connected to relay 1 / output 1 to signal that a limit value has been
exceeded.
Relay 3 / Output 3 is used to signal detected errors (e.g. optics error, faulty zero sample, missing
supply voltage at the analyser). If the analyser is in normal operation and there is no error, relay 3 /
output 3 is energised and the connection from COM to NO is switched. If a fault is detected, relay 3
/ output 3 drops out and makes the connection from COM to NC.
Relay 1 / Output 1 is energised when the (Upper limit 1) is exceeded and switches the connection
from COM to NO. This position can be programmed in the programme as a permanent contact or as
a pulse contact.
Permanent contact on relay 1 / output 1:
The relay 1 / output 1 remains switched in the position (connection from COM to NO) when the
limit value is exceeded (upper limit value 1) until the measured value is below the limit value (upper
limit value 1) again. Afterwards, the exceeding of the limit value is cancelled again and relay 1 /
output 1 switches back (connection from COM to NC).
Pulse contact on relay 1 / output 1:
Relay 1 / Output 1 remains in the position (connection switched from COM to NO) only for a
programmed pulse duration if the limit value is exceeded (Upper limit value 1). As soon as the
programmed pulse duration has expired, relay 1 / output 1 switches back (connection from COM to
NC). When the next limit value is exceeded (upper limit value 1), relay 1 / output 1 is switched again
as a pulse. This function is often used in combination with pilot distributors.
Programming: Menu > Settings > Outputs > Relay 1
