Functions Of The Allocated Bits And Words - Omron NT21 Reference Manual

Communications with the Host

1-4-4 Functions of the Allocated Bits and Words

Controlling the PT from
the PC
28
In the case of PTs that support the standard 1:N NT Link (NT20S, NT21, NT30,
NT30C, NT31, NT31C, NT600S, NT620S, NT620C, NT625C, NT631,
NT631C) up to 8 PTs can be connected to one port of the PC and used at the
same time. Up to 8 PTs (NT21, NT31, NT31C, NT631, and NT631C) can also
be connected simultaneously when the high-speed 1:N NT Link is being used.
All of the PTs connected to a PC port must use either the standard or high-
speed 1:N NT Link; the two communications systems cannot share a single
port.
When using a C200HX/HG/HE(-Z)E PC and standard 1:N NT Links, up to
three 1:N NT Link systems (i.e., 24 PTs) can be connected by installing a com-
munication board in the option slot of the CPU. For details on the communica-
tion board, refer to the SYSMAC Serial Communications Board Operation
Manual (W304-E1-j).
When using a CQM1H PC and standard 1:N NT Links, multiple 1:N NT Link
systems can be connected by installing Serial Communications Boards in the
Inner Board slots. For details on the Serial Communications Board, refer to the
CQM1H Serial Communications Board Operation Manual (W365-E1-j).
When using a CS1G/H/D PC, multiple 1:N NT Link systems (standard or high-
speed) can be connected by installing a Serial Communications Board in the
Inner Board slot. When using a CS1G/H/D or CJ1G/H/M PC, multiple 1:N NT
Link systems can be connected by installing a Serial Communications Unit on
the Backplane. For details on the Communications Board/Communications
Unit, refer to the CS/CJ Series Serial Communication Board/Unit Operation
Manual (W336-E1-j).
If the PC being used supports the Programming Console function, the NT21,
NT31/NT31C or NT631/NT631C can be used as a Programming Console.
If the PC being used supports the Device Monitor function, the NT31/NT31C or
NT631/NT631C can be used to change the PC's operating mode and read/
change data in the PC's memory areas. (The NT21 does not support the de-
vice monitor function.)
The NT Link is compatible with the host link. The PT screen data and PC pro-
grams used with the host link direct connection method can be used with the NT
Link method as they are.
Words and bits in the PC can be allocated to elements displayed on the PT and
PT status when using the direct connection function. By changing the contents
of the bits and words, the PT can be controlled from the PC. It is also possible to
send data to the PC by pressing touch switches at the PT.
The following PT functions can be controlled from the PC.
Screens:
Display of designated screens, confirmation of screen numbers, etc.
Memory table:
Writing to a memory table entry, copying from a memory table entry to anoth-
er memory table entry, etc.
Lamps:
Display instructions, confirmation of display status, etc.
Touch switches:
Display instructions, confirmation of display status, enable/disable opera-
tions, etc.
Numeric inputs, character string inputs, thumbwheel switch inputs:
Enable/disable inputs, etc.
Section 1-4