Metrohm 797 VA Computrace - Manual (Page 77)

2.13 Communication diagrams for automation
797 VA Computrace / Hardware-Manual 8.797.8001EN
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2.13.1 Communication diagram VA
797 VA Computrace
Tim
elin
e
Dosinos 1..3
838 Advanced Sample
Processor
731 Relay Box
Set line: Start 838 (TTL 3)
Ready (TTL 7)
Set line: Siphoning (TTL 5)
Prep Dosino 1,2,3 ?
Prep Dosino 1, 2, 3
YES
Set line: Siphoning (TTL 5)
Wait siphoning time
Set line: Rinsing (TTL 6)
Wait rinsing time
No. of Prep
cycles
Is it the
first sample of the
sequence ?
NO
Set line: Siphoning (TTL 5)
Wait siphoning time
NO
YES
Set line: Sample transfer (TTL 4)
Ready (TTL 7)
Predose Dosino 1, 2, 3
Measurement
Set line: Siphoning (TTL 5)
Wait siphoning time
Set line: Rinse needle (TTL 4)
Ready (TTL 7)
Set line: Siphoning (TTL 5)
Wait siphoning time
Set line: Rinsing (TTL 6)
Wait rinsing time
No. of rinsing cycles
Export/Print results
Set line: End of sample (TTL 1)
More samples ?
NO
YES
Set line: End of sample table (TTL 2)
Standard addition / Sample with calibration curve / Record calibration curve
active ?
YES
NO
Scan line : 838 ready
(TTL 7)
Scan line : 838 ready
(TTL 7)
Scan line : 838 ready
(TTL 7)
No. of rinsing cycles
Wait siphoning time
Set line: Siphoning (TTL 5)
Wait siphoning time
End
Fig. 37: Communication diagram for VA