16
Communication with the Host
Section 1-3
Features of the Direct Connection Function
The direct connection function has the following features.
S The bits and words referring to operating status and work instruction information
and those for storing input data can be freely allocated to almost any area of the
PC memory.
S Since the NT31/NT31C can directly refer to PC bit and word data without using
the program at the PC, it can be connected to the PC without changing the PC
program which controls the currently running production line.
S The area to control and notify the NT31/NT31C statuses, including display
screens, display/no display status, and buzzer output, can be freely allocated to
any part of the PC data area. This means that the PC status can be read and
controlled just by reading this area at the PC side, without preparing a special
communication program.
The direct connection function allows the NT31/NT31C to directly read and write
almost all bits and words in the PC and to automatically change the NT31/NT31C
screen display. This function can reduce the load on the PC so that its program
development efficiency is improved.
1-3-2 Host link
The host is connected to a PT in a 1:1 connection, and the words and bits of the
host are read and displayed by host link communication. This method can be used
for connection to the majority of PC types.
1-3-3 NT Link
NT link is a method for high-speed communication with a PC using the direct con-
nection function. The PCs that can be connected with the NT link are as follows.
S When using the built-in host link function of a CPU unit or SRM1
CPM1, CQM1, C200HS, C200HX/HG/HE(-ZE), CS1G/CS1H, CVM1/CV-se-
ries PC (-EV1 or later version), SRM1
S When using a communication board
C200HX/HG/HE(-ZE)
Besides the 1:1 NT link method, in which one PC is connected to one PT, the
NT31/NT31C can also use the 1:N connection NT link method, which allows a
maximum of eight PTs to be connected to one PC port.
PCs that can be connected with the 1:N connection NT link method are as follows.
C200HX/HG/HE (--Z), CS1G/CS1H
In the following sections, the term “NT link” is used to refer to the NT link commu-
nication method in general, the term “NT link (1:1)” is used to refer specifically to
NT links with a 1:1 connection, and the term “NT link (1:N)” is used to refer specifi-
cally to NT links with a 1:N connection.
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