Hello all,
I have an EtherCAT bus using fibre optic junction modules
(EK1521/EK1501) to access remote I/O. The DC system time transmission
delay reported by ethercat tool is giving me some odd numbers:
# ethercat slaves -v| egrep transmission
DC system time transmission delay: 0 ns // slave 0 - EK1100
DC system time transmission delay: 574771462 ns // slave 1 - EK1521
DC system time transmission delay: 2147484367 ns // slave 2 - EK1501
DC system time transmission delay: 2147484512 ns // ...
DC system time transmission delay: 2147484657 ns
DC system time transmission delay: 2147484802 ns
DC system time transmission delay: 2147485346 ns
DC system time transmission delay: 2147485486 ns
DC system time transmission delay: 2147485631 ns
DC system time transmission delay: 2147485776 ns
DC system time transmission delay: 2147485921 ns
DC system time transmission delay: 2147486076 ns
DC system time transmission delay: 2147487336 ns
DC system time transmission delay: 2147487476 ns
DC system time transmission delay: 2147487631 ns
DC system time transmission delay: 2147488491 ns
The offset values downstream of slave-2 resemble a lot to
2^31 = 2147483648
I'm wondering it that might point to some signed-ness (or other) issue
in the DC offset computation in the ethercat master?
The weird offset prevents me to control an EL2252 DC-module programmed
with time stamp. The device works fine if I don't use the fiber link.
Has anyone encountered or knows how to fix this?
I'm using master stable-1.5
Many thanks -
--
Matthieu Bec GMTO Corp.
cell: +1 626 354 9367 P.O. Box 90933
phone: +1 626 204 0527 Pasadena, CA 91109-0933
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