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SECTION 1
General
This section provides fundamental information about the functions and features of the NT631/NT631C, types of
connection, communications methods, etc. This information will enable you to understand the applications of the
NT631/NT631C.
1-1 Role and Operation of the NT631/NT631C. . . . . . . . . . . . . . . . . . . . . . . . . . 2
1-1-1 Operation of an NT631/NT631C at an FA Production Site. . . . . . . 2
1-1-2 Operations of the NT631/NT631C . . . . . . . . . . . . . . . . . . . . . . . . . 3
1-2 Functions of the NT631/NT631C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1-2-1 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1-2-2 Comparison between NT631 and NT631C . . . . . . . . . . . . . . . . . . . 7
1-2-3 Comparison between NT620S/NT620C/NT625C and NT631/NT631C 8
1-2-4 Principal Functions of NT631/NT631C. . . . . . . . . . . . . . . . . . . . . . 10
1-2-5 Displays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
1-3 System Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
1-3-1 Peripheral Devices That Can Be Connected . . . . . . . . . . . . . . . . . . 17
1-3-2 Connecting to the Host. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
1-4 Communications with the Host . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
1-4-1 Direct Connection Function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
1-4-2 Host Link . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
1-4-3 NT Link . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
1-4-4 Connecting to Other Companies’ PLCs. . . . . . . . . . . . . . . . . . . . . . 21
1-5 Communications Using Memory Links . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
1-5-1 Memory Link . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
1-5-2 Comparison between Direct Connection and Memory Link . . . . . . 22
1-5-3 Memory Link Online Transfer Function . . . . . . . . . . . . . . . . . . . . . 22
1-6 Before Operating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23