Specifications

Optimizing Performance
108
EIO0000000051 6/2010
Bandwidth:
Conclusion
The projected total load for the module—848 pps—is within the device implicit
messaging limit of 12000 data packets per second. The projected total bandwidth
for the communication module—6.26 Mbps—is also within the device implicit
messaging bandwidth limit of 80 Mbps. The projected total load and bandwidth for
all the remote devices (including the switch) are also within their 90% load and
bandwidth limits:
NOTE: Although the above calculations do not include any load contributed by
explicit messaging, such load is presumed to be less than 10% of the device load
and bandwidth.
Total = 848 pps
Switch = 848 pps
Device Packet size X Load = Bandwidth
I/O Adapter (A) 8000 bits X 500 pps = 4 Mbps
I/O Adapter (B) 4096 bits X 134 pps = 0.554 Mbps
I/O Drive (C) 8000 bits X 134 pps = 1.07 Mbps
I/O Scanner (D) 8000 bits X 80 pps = 0.64 Mbps
Total = 6.26 Mbps
Switch = 6.26 Mbps
Device Number of
packets per
connection
X Number of
connections
÷RPI =Load
Device 90% of Load Limit 90% of Bandwidth Limit
Ethernet Communication Module 10800 pps 72 Mbps
I/O Adapter (A) 7200 pps 63 Mbps
I/O Adapter (B) 7200 pps 63 Mbps
I/O Drive (C) 7200 pps 63 Mbps
I/O Scanner (D) 10800 pps 72 Mbps