14
Direct Connection Function
Section 1-4
1-4-2 C200H Direct Communication
C200H direct communication is a communication method that uses C200H,
C200HS, C200HX/HG/HE and CjjH I/O extensions.
The C200H direct communication function of the NT20S-ST122-V1 allows com-
munication with a PC (C200H, C200HS, C200HX/HG/HE, CjjH) using the di-
rect connection function.
Characteristics of C200H direct communication
C200H direct communication has the following characteristics.
S High-speed communication is possible through an I/O cable easily connected to
the CPU unit.
S Data can be written to the PC memory area in bit units.
This means that the unused bits of words allocated to touch switches can be
used for other applications (for example, lamp allocations).
Since the C200H direct communication function is compatible with the host link,
the NT20S screen data and PC programs for host link direct connection can also
be communicated by C200H direct communication without alteration.
Caution: With systems in which the user program operates in accordance with the PC cycle
time, since there is some fluctuation in the PC cycle time, the system operation
may not be consistent, and this should be born in mind when designing the system.
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