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Communications Using Memory Links Section 1-5
• Multiple 1:N NT Link systems (standard or high-speed) can be connected
by installing a Communications Board in the Inner Board slot of the CPU
Unit for a CS1G/H/D PLC or installing a Serial Communications Unit on
the Backplane for a CS1G/H/D or a CJ1G/M/H PLC. For details on the
Communications Board/Communications Unit, refer to the CS/CJ-series
Serial Communications Board/Unit Operation Manual (W336-E1-@).
• If the PLC used supports the Programming Console function, the NT31/
NT31C can be used as a Programming Console.
• If the PLC being used supports the Device Monitor function, the NT31/
NT31C can be used to change the PLC’s operating mode and read/
change data in the PLC’s memory areas.
The NT link is compatible with the host link. The NT31/NT31C screen data
and PLC programs used with the host link direct connection method can be
used with the NT link method as they are.
1-4-4 Connecting to other Companies’ PLCs
Installing a system program for multi-venders by using a specific system
installer enables the NT31/NT31C to be connected to the PLCs of other mod-
els in direct connection. This system installer is supplied with the Support Tool
(NT-ZJCAT1-EV4).
Compatible PLC The NT31/NT31C can be connected to the following model PLCs.
• 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 PLCs, refer to the
PLC Connection Manual or NT31/631 Multi Vendor Connection Manual.
1-5 Communications Using Memory Links
In this section, a communications 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 com-
puter or a FA computer and the NT31/NT31C by using RS-232C/422A com-
munications.
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 PLC. 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. Fre-
quently used commands are kept handy for read and write tasks of the
numeral memory table, character-string memory table, and bit memory table.
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