Omron NT31 NT31C manual Communications Using Memory Links, Connecting to other Companies’ PCs

Communications Using Memory Links Section 1-5

1-4-4 Connecting to other Companies’ PCs

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).

Compatible PC 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.

1-5 Communications Using Memory Links

In this section, a communication method other than the direct connection, called the memory link, is discussed.

1-5-1 Memory Link

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.

PT

PT memory

Numeral

memory

table

Lamp

Direct connection

RS-232C/422A communication

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).

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