ProSoft Technology ProTalk PTQ-PDPMV1 User Manual page 216

Hot Standby Support
User Manual
The Watchdog Time, Delta Ttr and other parameters can only be edited by
selecting the User-Defined profile.
When the "Hot Standby System" checkbox is marked, the PCB Master
configuration tool follows the rules below:
Parameter Calculation
Ttr is to be doubled in order to support one "passive" and one "active" Hot
Standby Master on the same network. Note that the Watchdog value also must
be recalculated because of the doubled Ttr.
To allow a switchover the Watchdog value that is calculated from the Ttr must be
increased. Two new parameters are introduced: HsbyWatchdogFactor and Host
Delay Time. The watchdog is calculated according to the following equation:
Watchdog = (Calculated watchdog * HsbyWatchdogFactor) + Host Delay Time
The HsbyWatchdogFactor for different baud rates is defined in the following
table:
Baud Rate
9.6 kBaud
19.2 kBaud
45.45 kBaud
93.75 kBaud
187.5 kBaud
500 kBaud
1.5 MBaud
3 MBaud
6 MBaud
12 MBaud
The Host Delay Time is set to 300 ms in the PCB Master configuration.
Invalid Master addresses:
1 The Master address must not equal 0.
2 The Master address must not equal any assigned slave address + 1.
Invalid Slave addresses:
1 A slave address must not equal the assigned Master address - 1.
Page 216 of 306
PROFIBUS DP Master Network Interface Module for Quantum
XML Keyword
HsbyWdFactor_9_6k
HsbyWdFactor_19_2k
HsbyWdFactor_45_45k
HsbyWdFactor_93_75k
HsbyWdFactor_187_5k
HsbyWdFactor_500k
HsbyWdFactor_1_5M
HsbyWdFactor_3M
HsbyWdFactor_6M
HsbyWdFactor_12M
PTQ-PDPMV1 ♦ Quantum Platform
Value
1
1
1
1
1
1
2
2
2
2
ProSoft Technology, Inc.
August 12, 2014