| The largest project I know of has 60 nodes
on a single network talking to the same Citect servers. This system
is using Windows for Workgroups 3.11, Citect version 2.11 on
Pentium 100 and 486/100 class computers over non switched 10Mb
Ethernet. With the 60 nodes the performance of the system is around
2-3 seconds. This performance limitation is not due to the number
of nodes on the network but the PLC protocol performance. I would
expect such a system to be able to handle up to 100 nodes. Since
this system was installed we have made various performance
improvements in Citect. There has also been much faster Pentium Pro
computers released as well as much faster switched 100Mb network
hardware become available. I would also expect that using Windows
NT with such hardware should allow a much larger maximum. This
could be up to and possibly greater than 255 nodes. The exact limit
will depend on exactly what the Citect project is doing, how much
data each client is requesting and other background load on the
Citect servers. |
