Schneider Electric Modicon BM85 - Manual (Page 74)

Configuring the Programmable Models 890 USE 103 00 64
4.5 Preparing the BM85 for Downloading
The BM85 rear panel has two sets of switches. One set allows the BM85
to either accept a download or run an application that was previously
downloaded. The other set of switches assigns a Modbus Plus node
address.
Before you can download your application you must set the switches to
allow the load. You must also set the node address to agree with the
address parameter you are using with the download utility program.
Instructions for setting the switches are provided in Sections 4.6 and 4.7.
You can download to the BM85 at its installation site. You might find it
more convenient to have a spare Modbus Plus network connector in the
vicinity of your download host, and to perform the download locally.
Caution:ąAdding a new node to an active network causes an
increase in the network's token rotation time, reducing the
overall data throughput. Before you connect or disconnect any
device on an active network, you should be aware of its effect
on network timing.
After the download is completed, the BM85 switches must be set to allow
it to run the application. All BM85 switch settings are sensed on
power-up.