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1-4
Section
Communication Using the Direct Connection Function
11
1-4
Communication Using the Direct Connection Function
1-4-1 Direct Connection Function
The communication method applied between the NT620S/620C and the PC is
either a host link or NT link.
The NT620S/620C can be used to refer to the contents necessary for the display
information or to allocate the bits and words used for storing the input data to any
area in the PC. The NT620S/620C can directly write and read such allocated bits
and words so as to change the display elements, control the operating status,
and notify the status.
This function is called the “direct connection function”. The NT620S/620C is de-
signed exclusively for use with the direct connection.
The bits and words allocated by the direct connection function are called “allo-
cated bit” and “allocated word” respectively.
This function allows to read the information to be displayed on the NT620S/620C
from the memory area in the PC and to write it to the memory table in the
NT620S/620C. Also, the data input on the NT620S/620C can be written to the
PC’s memory area. The NT620S/620C screen status can be switched according
to the PC’s memory area, and the NT620S/620C’s status data can be written to
the PC’s memory area.
NT620S/620C
PC
DM area
Internal relay area
Auxiliary relay area
Timer/counter
Features of the Direct Connection Function
S
The bits and words referring to operating status and work instruction informa-
tion 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 NT620S/620C 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 production line.
S
The area used for control and notification of NT620S/620C statuses, including
displayed screens, whether the screen display is on or off, buzzer output, etc.,
can be freely allocated to any part of the PC memory.
The direct connection function allows the NT620S/620C to directly read and
write almost all bits and words in the PC and to automatically change the
NT620S/620C screen display. This function can reduce the load on the PC so
that the program development efficiency of the PC improves.
Summary of Contents for NT620C
Page 1: ...Cat No V033 E1 5 Programmable Terminals NT620S 620C OPERATION MANUAL...
Page 2: ...NT620S 620C Programmable Terminals Operation Manual Revised April 2001...
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