Technical information

Deltabar M PMD55
10 Endress+Hauser
Dead time, Time constant
P01-xxxxxxxx-05-xx-xx-xx-036
Presentation of the dead time and the time constant
Dynamic behavior:
current output
Dynamic behavior: HART
Reading cycle
• Acyclic: max. 3/s, typical 1/s (depends on command # and number of preambles)
• Cyclic (Burst): max. 3/s, typical 2/s
The Deltabar M commands the BURST MODE function for cyclic value transmission via the HART
communication protocol.
Cycle time (Update time)
Cyclic (Burst): min. 300 ms
Response time
• Acyclic: min. 330 ms, typical 590 ms (depends on command # and number of preambles)
• Cyclic (Burst): min. 160 ms, typical 350 ms (depends on command # and number of preambles)
Dynamic behavior:
PROFIBUS PA
Reading cycle
• Cyclic: max. 30/s (dependent on the number and type of function blocks used in a closed-control loop)
• Acyclic: typical 25/s
Cycle time (update time)
min. 100 ms
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.
Response time
• Cyclic: approx. 8 to 13 ms (depends on Min. Slave Interval)
• Acyclic: approx. 23 to 35 ms (depends on Min. Slave Interval)
I
63 %
100 %
t
t
1
t
2
90 %
t
3
Dead time (t
1
) [ms] Time constant T63 (= t
2
) [ms] Time constant T90 (= t
3
) [ms]
max. 60 90 210
Dead time (t
1
) [ms] Dead time (t
1
) [ms] +
Time constant T63 (= t
2
) [ms]
Dead time (t
1
) [ms] +
Time constant T90 (= t
3
) [ms]
min. 220 310 370
max. 1020 1110 1170
Dead time (t
1
) [ms] Dead time (t
1
) [ms] +
Time constant T63 (= t
2
) [ms]
Dead time (t
1
) [ms] +
Time constant T90 (= t
3
) [ms]
min. 95 185 245
max. 1195 1285 1345