Anybus CompactCom 40 Network Manual page 109

Appendix E: Timing & Performance
E.2.4 Event Based Process Data Delay
"Read process data delay" is defined as the time from when the last bit of the network frame
has been received by the network interface, to when the RDPDI interrupt is asserted to the
application.
"Write process data delay" is defined as the time from when the application exchanges write
process data buffers, to when the first bit of the new process data frame is sent out on the
network.
The tests were run in 16-bit parallel event mode, with interrupts triggered only for new process
data events. Eight different IO sizes (2, 16, 32, 64, 128, 256, 512 and 1024 bytes) were used in
the tests, all giving the same test results.
The delay added by the PHY circuit has not been included, as this delay is insignificant com-
pared to the total process data delay.
Parameter
T101
T102
Ethernet
Network
Fig. 3
Ethernet
Network
Fig. 4
Anybus CompactCom 40 EtherNet/IP Transparent Ethernet Network Guide
Description Delay (min.)
-
Read process data
delay
Measured at an IO
size of 32 bytes
-
Write process data
delay
Measured at an IO
size of 32 bytes
Ethernet Ethernet Ethernet
connector Trafo PHY
Ethernet Ethernet Ethernet
connector Trafo PHY
Delay (typ.) Delay
(max.)
-
84
-
106
Anybus
Host
NP40
connector
Read process data delay
Anybus
Host
NP40
connector
Write process data delay
107 (144)
Unit
μs
μs
Host Application
Host Application
SCM-1202-019-EN 1.6