ISPSoft User Manual

ISPSoft User Manual
Users can type a value in the box.
Users can select a data format.
Users can display or hide the binary
mode.
In the binary mode, users can set the
states of the bits through the mouse.
16.3.6 Importing Points About Constructing a PLC Link
There is only one master station in an RS-485 network. If the node designated as a master station
has several serial ports, the node can not be designated as a master station in another RS-485
network, but can be designated as a slave station in another RS-485 network. In the figure below,
C1 on the node AH-01 is designated as a master station in network #1, and TR1 on the node AH-01
is designated as a slave station in network #2. Besides, C1 on AH-01 and TR2 on AH-01 are
connected to network #1. The station addresses assigned to these two ports are different. As a
result, TR2 is allowed to be designated as a slaved station in network #1.
When a PLC Link is executed, the master station sends reading/writing commands to the slave
stations according to the data exchange table created. Another master station which can send
commands is not allowed to exist. If there is an unknown device which does not appear in
NWCONFIG and which can send commands in an RS-485 network, or there is a device which is
designated as a slave station and which can send reading/writing commands in an RS-485 network,
an error occurs when more than one device sends commands. As a result, after users create a
network in NWCONIFG, they have to make sure that the actual connection is consistent with the
network created in NWCONFIG.
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