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Mitsubishi Electric Melsec Q Series User Manual page 145

Profibus-dp master module
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4
FUNCTIONS
System Configuration
When using only non-redundant DP-Slaves
When using redundant and non-redundant
DP-Slaves
When using only redundant DP-Slaves
Multi-master system configuration
(b) Precautions on the DP-Slave side
1) Watchdog timer setting value
Set a watchdog timer value so that it satisfies the following formula.
If the formula is not satisfied, a watchdog timer error occurs in DP-Slaves
during system switching.
Table4.13 Watchdog timer setting value
<
Watchdog timer
(Bus cycle time
switching time (
Line switching time of DP-Slave
For the line switching time for a DP-Slave, refer to the manual of
the DP-Slave, or contact the manufacturer.
HSA
MSI (
* 1 In addition to the QJ71PB92V used in the redundant system, another DP-Master is connected on
the same PROFIBUS network.
2) When using only redundant DP-Slaves
It may take several seconds until system switching is completed on the DP-
Slave side.
Before setting the watchdog timer of a DP-Slave, confirm the specifications of
the DP-Slave.
4.8 Redundant system support function
Description
2) + Redundant system
Section 3.5.1, 3.5.3)
Section 3.5.1, 6.4)
1
2
Reference
Section 2.3.2 (1)
Section 2.3.2 (3)
3
Section 2.3.2 (2)
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5
6
7
8
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