Omron NT31 User Manual

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Communication with the Host

Section 1-3

1-3 Communication with the Host

The NT31/NT31C is connected to the host by one of the following four commu-

nication methods.

S Host link method:

S NT link (1:1) method

S NT link (1:N) method

S Memory link method

In all of these communication methods that can be used with NT31/NT31C, data

communication with host is by ”direct connection” (Memory link is, however, a qua-

si--direct connection).

In the following, the host link and NT link that carry out the “direct connection” will

be discussed. Memory link will be explained in section “1--4 Communication by

memory link”.

1-3-1 Direct Connection Function

With the NT31/NT31C, the bits and words referring to data required for display,

and those for storing input data, can be allocated to any part of the PC memory

area.

The NT31/NT31C can directly write to and read from suchallocatedbits andwords

to changethe displaystatus of the elements on the PT screen, controlthePT oper-

ating status, and notify statuses to the host.

This function, which directly reads and writes the statuses of words and bits with-

out using a PC program is called the “direct connection” function.

The words and bits allocated for direct connection are called the “allocated words”

and “allocated bits”.

The direct connection function allows the data to be displayedat the NT31/NT31C

to be read from the memory area in the PC and written to memory tables in the

NT31/NT31C. Also, the data input at the NT31/NT31C can be written to the

memory area in the PC. The NT31/NT31C screen can be changed in accordance

with statuses in the PC memory area, and the NT31/NT31C’s status data can be

written to the PC’s memory area.

PCNT31/NT31C

DM area I/O relay area

Auxiliary relay area Timers/counters

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