Chapter 2 System Configuration
2-4

2.2 Product Functional Model
The following describes functional model of the MASTER-K120Sseries.

2.2.1 Product Functional Block
Product function block for the K120S series is as follows.
Main Unit Expansion Modules
Power supply Input signal Input signal
Built-in RS-232C I/F Output signal Output signal
Sub-system Description
CPU • Signal processing function
-. Operating system function
-. Application program storage / memory function
-. Data storage / memory function
-. Application program execution function
Input • The input signals obtained from the machine/process to appropriate signal levels for
processing
Output • The output signals obtained from the signal processing function to appropriate signal
levels to drive actuators and/or displays
Power Supply • Provides for conversion and isolation of the PLC system power from the main supply
Communication
Interface
• Provides the data exchange with other systems or PADT, such as KGLWIN, personal
computers
Built-in
RS-485
Special/communication
modules
Power
supply
Comm. I/F
Input
Output
Input
Output

CPU

•
DC24V
Power
supply