Software
Additionally the master of the ECX-EC secondary side adapts the time that is spread by this slave,
so it matches the other side’s time (“Correction” in Fig. 24).
This correction is done by writing the slave’s
DC System Time
(register 0x0910), which provides
for the fact that the clock frequency is adapted accordingly, when the timestamps show the clock
runs too slow, a higher value is written, and vice versa.
INFORMATION
The described correction can be performed basically with every EtherCAT slave, the
ECX-EC does not have to be the DC Reference slave and/or the first slave as shown.
6.2.4.2.3 DC in Redundancy Case
Fig. 25:
DC synchronisation in redundancy case
Page 38 of 74
Manual • Doc. No.: E.3022.21 / Rev. 1.9
ECX-EC
Slave
n
...
Slave6
Slave5
Master
Slave1
Slave2
Slave3
Slave4
Redundancy:
Primary
Redund.
Slave
n
...
Slave6
Slave5
Master
Slave1
Slave2
Slave3
Slave4
ECX-EC
Primary
Redund.
Correction
Normal operation:
(Pri.)
(Sec.)
(Pri.)
(Sec.)
