ProSoft Technology ProTalk PTQ-PDPMV1 User Manual page 196

Hot Standby Support
User Manual
Calculated Times for Detecting a Missing Counterpart
Baud Rate
12 Mbps T
= 50 ms, T
TR
1.5 Mbps T
= 186 ms, T
TR
500 kbps  T
TR
93.75 kbps (PA)  T
45.45 kbps (PA)  T
9.6 kbps  T
= 23200 ms, T
TR
Ping Sequence
This section shows the ping sequence, and how the COM-bit in register "HSBY
Remote status" is affected under different scenarios.
The figures show the active and the remote (passive) Masters connected via the
PROFIBUS network. For each Master, the DPRAM (that is, application interface)
and the software objects that are responsible for the ping sequence are shown.
Start-up
Local (active) Master operational prior to passive
As soon as the local (active) Master is ready to communicate on the PROFIBUS
network, it would start polling for ping messages from the passive one. As soon
as it receives the first ping request, the COM-bit is altered from zero to one.
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= 1000 Tbits
SL
= 300 Tbits
SL
= 500 ms, T = 200 Tbits
SL
= 2374 ms, T = 100 Tbits
TR SL
= 14000 ms, T = 640 Tbits
TR SL
= 100 Tbits
SL
PROFIBUS DP Master Network Interface Module for Quantum
TA[ms]
55
205
550
2611
15400
25520
PTQ-PDPMV1 ♦ Quantum Platform
TP[ms] TFA[ms]
≤ T
1
TR
2
4
9
113
83
ProSoft Technology, Inc.
August 12, 2014