Direct Connection Function - Omron NT-series Operation Manual

     
2-4

Direct Connection Function

Reference
Features of the Direct Connection Function
The communication method applied between the NT600S and the PC is either a
host link or NT link or C200H or RS232C direct.
The following deals with the "direct access" available when a host link, NT link, or
C200H direct is used, and the communication with a PC.
For the communication through RS-232C, refer to "2-6 Communications by
RS-232C" (page 19)
The NT600S can be used to refer to the contents necessary for the display in-
formation or to allocate the bits and words used for storing the input data to any
area in the PC. The NT600S 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 NT600S is designed
exclusively for use with the direct connection.
The bits and words allocated by the direct connection function are called "allocated
bit" and "allocated word" respectively.
This function allows to read the information to be displayed on the NT600S from
the memory area in the PC and to write it to the memory table in the NT600S. Also,
the data input on the NT600S can be written to the PC's memory area. The
NT600S screen status can be switched according to the PC's memory area, and
the NT600S's status data can be written to the PC's memory area.
NT600S

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.

The NT600S can directly refer to PC bit and word data so that it can be con-
nected to a PC without changing the PC program which controls currently run-
ning production line.

The area to control and notify the NT600S status, including display screens, ON/
OFF of the backlight/EL display screen, and buzzers can be freely allocated to
any part of the PC memory.
The direct connection function allows the NT600S to directly read and write almost
all bits and words in the PC and to automatically change the NT600S screen dis-
play. This function can reduce the load on the PC so that the program development
efficiency of the PC improves.
Section 1-4
PC
DM area Internal relay area
Auxiliary relay area
Timer/counter