App6-2 Appendix 6 Universal Serial Communications
Differences between Connecting to a General-purpose Computer and Connecting to
the PLC
• Input format (code)
The input format used for screen number, block number, message number, etc, is fixed in [DEC].
• Write area
When connecting to the PLC, only the three words shaded in the diagram below are used, but
when connecting to a general-purpose computer, all 16 words shown below are used.
Address Name Contents
n+0 CFMDAT Sub command/data
n+1 SCRN_COM Screen status
n+2 SCRN_No Displayed screen
n + 3 SW0 No. 0 switch data
n + 4 SW1 No. 1 switch data
n + 5 ENT0 Entry information 0
n + 6 ENT1 Entry information 1
n + 7 ENT2 Entry information 2
n + 8 GREPNS Global response
n+9
•
•
•
n+15
Reserved (7 words)
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