Siemens SITRANS DA400 Operating Instructions Manual page 68

Signal processing
7.4 Activation of digital outputs
Example
P.20/doAL3 = do4
P.22/doAL4 = ¬do6
Note
The parameter "P.25/P ouT" reverses the direction of action for all outputs.
68
The main alarm on acoustic channel 3 is output on digital output 4.
The main alarm on acoustic channel 4 is output inverted on digital
output 6.
SITRANS DA400 for material flow monitoring with protection against explosion
Operating Instructions, 09/2007, A5E00841152-01