5. Programming
5-2
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Communication control program
- This program performs I/O communication between the PI/O unit and the CPU module.
CPU module
J.NET module
PI/O unit
I/O area
I/O buffer
PI/O input
PI/O output
Figure 5-2 Flow of communication data of the communication control program
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NET status, S-register, and S-table
These tables and register contain data transmission/reception information and error information set by the
communication control program. User programs reference this information to transmit and receive information
and handle errors.
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I/O area
Table 5-1 lists I/O areas that permit I/O communication.
Table 5-1 I/O areas
Name
Symbol range
Number of points
External input
XW0000 (X0000) to XWFFF0 (XFFFF)
4,096 words (65,536 points)
External output
YW0000 (Y0000) to YWFFF0 (YFFFF)
4,096 words (65,536 points)
Internal register
RW000 (R000) to RWFF0 (RFFF)
256 words (4,096 points)
Global link register
GW000 (G000) to GWFF0 (GFFF)
256 words (4,096 points)
Transfer register
JW000 (J000) to JWFF0 (JFFF)
256 words (4,096 points)
Receive register
QW0000 (Q0000) to QWFFF0 (QFFFF)
4,096 words (65,536 points)
Event register
EW0400 (E0400) to EWFFF0 (EFFFF)
3,072 words (49,152 points)
Extended internal register
MW0000 (M0000) to MWFFF0 (MFFFF)
4,096 words (65,536 points)
Function work register
FW000 to FWBFF
3,072 words
Work register
LBW0000 to LBWFFF0
8,192 words (131,072 points)
Word work register
LWW0000 to LWWFFFF
65,536 words
Word work register
LXW0000 to LXW3FFF
16,384 words
Summary of Contents for 510VE
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