Deltabar S
12 Endress+Hauser
Dynamic behavior
PROFIBUS PA
Dead time, Time constant (T63)
A typical cyclic parametrization for the PLC of 20 values per second results in the following total dead time:
Response time
• cyclic: approx. 10 ms per request
• acyclic: < 50 ms
All values are typical values.
Cycle time (Update time)
The cycle time in a bus segment in cyclic data communication depends on the number of devices, on the
segment coupler used and on the internal PLC cycle time.
Dynamic behavior
FOUNDATION Fieldbus
Dead time, Time constant (T63)
If the macro cycle time (Hostsystem) is set to a typical value of 250 ms, the following total dead time results:
Reading cycle
• cyclic: up to 5/s, dependent on the number and type of function blocks used in a closed-control loop
• acyclic: 10/s
Response time
• cyclic: < 80 ms
• acyclic: < 40 ms
All values are typical values.
Cycle time (Update time)
250 ms
Type Dead time t
1
Time constant (T63), t
2
PMD75 295 ms • 10 mbar and 30 mbar measuring cell: 200 ms
• 100 mbar measuring cell: 60 ms
• 500 mbar measuring cell: 45 ms
• 3 bar measuring cell: 40 ms
• 16 bar and 40 bar measuring cell: 60 ms
FMD77, FMD78 dependent on the diaphragm seal
PMD70, FMD76 340 ms • 25 mbar measuring cell: 4700 ms
• 100 mbar measuring cell: 280 ms
• 500 mbar measuring cell: 210 ms
• 3 bar measuring cell: 110 ms
Type Dead time t
1
Time constant (T63), t
2
PMD75 295 ms • 10 mbar and 30 mbar measuring cell: 200 ms
• 100 mbar measuring cell: 60 ms
• 500 mbar measuring cell: 45 ms
• 3 bar measuring cell: 40 ms
• 16 bar and 40 bar measuring cell: 60 ms
FMD77, FMD78 dependent on the diaphragm seal
PMD70, FMD76 340 ms • 25 mbar measuring cell: 4700 ms
• 100 mbar measuring cell: 280 ms
• 500 mbar measuring cell: 210 ms
• 3 bar measuring cell: 110 ms
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