1-4SectionCommunications with the Host
34
1-4-5 Clock Data Area (PC to PT) (NT21 Only)
The NT21 does not have a built-in clock and instead uses the clock data from the
PC. The seconds, minutes, hour, day, month, year, and day of week data is read
from the PC into a Clock Data Area.
The NT21 periodically updates the data in the Clock Data Area, storing the data
in numeral table entries 247 to 253. These table entries are used to read the
clock data. When displaying the time or date on the NT21 or when using the
screen display history or alarm history, allocate the Clock Data Area in PC
memory and periodically update the contents of the allocated words in the PC
using the PC’s ladder diagram. (The structure of the clock data in the NT21 is the
same as the structure of the words containing the clock data in the PC. If these
words are allocated for the Clock Data Area, then periodic updating from the lad-
der diagram is not necessary.
Numeral table
Clock Data
Minutes and seconds
Day and hour
Year and month
Day of week
PCPT
2001/9/25
13:47:58
247
248
249
250
251
252
253
58
47
13
25
9
1
2
4758
2513
0109
0002
1-4-6 Connecting to other Companies’ PCs
Installing a system program for multi-venders by using a specific system installer
enables the NT31/NT31C or NT631/NT631C to be connected to the PCs of oth-
er companies in direct connection. This system installer is supplied with the Sup-
port Tool (NT-ZJCAT1-EV4). (The NT21 does not support this function.)
The NT31/NT31C and NT631/NT631C can be connected to the following Mitsu-
bishi PCs.
• Mitsubishi A-series programmable controller (computer link module)
• Mitsubishi FX-series programmable controller
• SLC500 Series by Allen-Bradley
• 90-20 and 90-30 Series by GE Fanuc
• S7-300 and S7-400 Series by Siemens
• TSX Series by Modicon
For details on the procedure for connecting to other model PCs, refer to the PC
Connection Manual, or NT31/631 Multi Vendor Connection Manual.
Compatible PCs
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