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3-3．Constitution principle
(1) About communication port
The basic units of XSDH/XS3/XSLH series are generally equipped with multiple communication
ports, including COM1, COM2, COM3, etc.
Most communication ports can be used for programming download and communication.
Each port is independent of each other.
(2) About expansion devices
Generally speaking, the basic unit can be expanded with different types of expansion modules, or
mixed expansion, input and output expansion, analog and temperature expansion.
The XSDH/XS3/XSLH series can expand up to 16 modules.
After connecting the basic unit and the expansion module with the bus connector, the PWR indicator
of the expansion module is on, and the expansion module can be used normally.
(3) About the calculation of points
Points are the actual input and output points.
When the expansion module is connected, the total number of points = the number of points of the
basic unit + the number of points of the expansion module.
The serial number of input / output digital value is octal.
The serial number of input and output analog quantity is decimal.
Basic unit XS3-26T4 (18I/8O) connects 5 XG-E8X8YR modules, the total points will be:
Input points: 18 + 8 *5 = 58
Output points: 8 + 8 *5= 48
Total points: 58+48= 106
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