Communications Using Memory Links; Connecting To Other Companies' Pcs; Memory Link - Omron Programmable Terminals NT31 NT31C Setup Manual

Communications Using Memory Links

1-4-4 Connecting to other Companies' PCs

Compatible PC
1-5

Communications Using Memory Links

1-5-1 Memory Link

20
Installing a system program for multi-venders by using a specific system installer
enables the NT31/NT31C to be connected to the PCs of other models in direct
connection. This system installer is supplied with the Support Tool (NT-
ZJCAT1-EV4).
The NT31/NT31C can be connected to the following model PCs.
• Mitsubishi A series programmable controller (computer link module)
• Mitsubishi FX series programmable controller
• SLC 500 Series by Allen-Bradley
• 90-20 and 90-30 Series by GE Fanuc
• S7-300 and S7-400 Series by Siemens
For details on the procedure for connecting to other model PCs, refer to the PC
Connection Manual or NT31/631 Multi Vendor Connection Manual.
In this section, a communication method other than the direct connection, called
the memory link, is discussed.
Memory link is a method to send and receive data between a personal computer
or a FA computer and the NT31/NT31C by using RS-232C/422A communica-
tion.
In memory link, there is an area called PT Memory, as shown below, inside the
NT31/NT31C, and this area is treated as a virtual area on the PC. This allows PT
memory and the display elements of the NT31/NT31C to make a quasi-direct
connection. By sending a command for the memory link, the host can make the
NT31/NT31C execute processes through PT memory. Frequently used com-
mands are kept handy for read and write tasks of the numeral memory table,
character-string memory table, and bit memory table.
NT31/NT31C
PT
Numeral
memory
table
Lamp
Direct connection
In the memory link method, the only difference is that the NT31/NT31C finds its
communication target inside instead of outside. In the memory link method,
therefore, change of the target is all that is needed to be capable of using the
exact screen data that is acquired by the direct connection. (With the
NT31/NT31C, the Support Tool must be used to convert the data to screen data
for the memory link.)
When compared to the direct connection of the host link or NT link methods, the
memory link method has some restrictions regarding the use of some functions,
as described below.
• The Programming Console and Device Monitor functions cannot be used.
• The following strobes of PT status notify bits does not turn on (page 7 to 27).
PC
PT memory
RS-232C/422A
communication
Section 1-5