Nt Link - Omron NT20S Operation Manual

Direct Connection Function
Features of the Direct Connection Function
1-4-1

NT Link

Features of the NT Link
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 part of the
PC memory. Bits and words in the PC can be referenced from any memory table.
S The NT20S can directly refer to PC bit and word data so that it can be connected
to a PC without changing the PC program which controls currently running pro-
duction line.
S The area to control and notify the NT20S status, including display screens, back-
lighting or a flash control, and alarms and buzzers can be freely allocated to any
part of the PC memory.
S Can be used irrespective of the operating mode of the PC.
The direct connection function allows the NT20S to directly read and write almost
all bits and words in the PC and to automatically change the NT20S screen display.
This function can reduce the load on the PC so that the program development effi-
ciency of the PC improves.
The NT link uses the direct connection function and can execute high-speed com-
munications with the CPU (with built-in host link) of the CPM1, CQM1, C200HS,
C200HX/HG/HE, or CVM1/CV series,
When using the NT20S in an NT link, two communications modes are possible: a
single NT20S can be connected to one PC (1:1 NT link), or alternatively, up to eight
NT20S units can be connected to a single PC port (1:N NT link).
However, the 1:N connection NT link can be used with C200HX/HG/HE only. In
the following sections, the NT link communication mode in general will be indicated
by the term "NT link", a 1:1 connection NT link will be indicated by "NT link (1:1)",
and a 1:N connection NT link will be indicated by "NT link (1:N)".
S High speed communications with specific types of PCs can be executed.
S Writing in units of bits to the PC memory area is possible.
This enables another bit of a word data to which a touch switch has been allo-
cated to be used for other purpose (e.g., to allocate a lamp).
S Can be used even while the PC is in the run mode. When using a host link, the
NT20S switches from the run mode to the monitor mode.
S With NT link (1:N), up to eight NT20S units can be connected to a single PC port
and used simultaneously.
S When using C200HX/HG/HE, by installing an expansion communication board
in the option slot of the CPU unit, it is possible to connect up to three NT link (1:N)
systems (comprising a total of 24 NT20S units). For details on communication
boards, refer to the SYSMAC C200HW-COM01 to C200HW-COM06-E Com-
munication Board OPERATION MANUAL (W304-E1-j).
The NT link is compatible with the host link. The NT20S screen data and the PC
programs handled by the host link direct connection can be used with for the NT
link as they are.
Section 1-4
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