ISPSoft User Manual

Chapter 16 Network Configuration and Data Exchange
• Synchronic R/W
Generally speaking, a master station sends a writing command and a reading command to a
slave station separately. If the Synchronic R/W checkbox is selected, the master station can
complete reading and writing simultaneously by means of a specific Modbus function code (the
hexadecimal code 17), and the efficiency of data exchange is increased. However, the users
have to make sure that the devices involved in data exchange support the Modbus function code
before they select the Synchronic R/W checkbox. If the devices do not support the Modbus
function code, the Modbus code can not be identified, and the reading/writing of data will fail after
they receive the commands from the master station.
• Run PLC Link after downloading
If the Run PLC Link after downloading checkbox is selected, the PLC Link constructed will be
enabled after the PLC Link constructed is downloaded to the PLC connected to the computer.
• Interval Time (ms)
The users can specify how often the master station sends a command.
After the users click , the system will lead the users to the next step. If the users click
, the system will lead the users to the previous step.
16.3.4 Creating a Data Exchange Table (Step 3)
16.3.4.1 Introduction of a Data Exchange Table
The table below is a data exchange table. When a PLC Link is executed, the master station sends
reading/writing commands to the slave stations according to the data exchange table created.
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