Appendix A,
Port 3 Ethernet Port /
OPC Server
• This device has the capability to communicate to third party HMI
packages, such as Wonderware, Intellution, etc.
• Communication is done through the ethernet board, which is
located on the ModCon75 Controller port 3 location.
• Communication is ModBus over ethernet.
• One can communicate through the OPC server (available as a
download on http:\\www.unitronics.com/download.htm) or through
an ethernet server provided by the third party vendor.
• Using the OPC server, the following will apply:
• Mapping of variables:
• Name = Modcon75
• IP Address = 192.168.1.11
• Subnet Mask = 255.255.255.0
• Gateway = 192.168.1.254
• Retrieving gas value for specific sensor:
Value is split into two registries;
For example, ID#2 sensor #1:
• MI300 provides value to the
left of the decimal point
• MI325 provides value to the
right of the decimal point.
(See Appendix B, "Memory Integers").
• When using the ethernet server (provided by the third party
vendor), the addressing may be off-set by one.
A-1
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