| The S9000 CPU co-exists with an IPC620
CPU. Citect can communicate via the IPC620 CPU using Citect's HWELL
protocol, which is documented in the Citect online help.
To access the S9000 CPU variables, you need to copy the required
S9000 CPU's variables to a table in the IPC620 CPU and read/write
from there. However, problems may occur if Citect is replacing an
existing system, as communications to the S9000 CPU is via the DMCS
protocol over Ethernet using the ELPM card from Honeywell. The
programming software can also use the Ethernet link via the ELPM
card (ie. there is no need for the serial connection to the IPC620
CPU). Citect does not have an Ethernet driver to communicate
directly with the S9000 CPU.
The IPC620 also has an EIM module that allows Ethernet
communications. Citect does not have a driver to this - users who
wish to connect to via the EIM module should contact Ci
Technologies.
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