Figure 5-2 Flow Of Communication Data Of The Communication Control Program; Table 5-1 I/O Areas - Hitachi J.NET User Manual

5. Programming
● Communication control program
- This program performs I/O communication between the PI/O unit and the CPU module.
CPU module
I/O area

Figure 5-2 Flow of communication data of the communication control program

● 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.
● I/O area
Table 5-1 lists I/O areas that permit I/O communication.
Name
External input
External output
Internal register
Global link register
Transfer register
Receive register
Event register
Extended internal register
Function work register
Work register
Word work register
Word work register
J.NET module
I/O buffer

Table 5-1 I/O areas

Symbol range
XW0000 (X0000) to XWFFF0 (XFFFF)
YW0000 (Y0000) to YWFFF0 (YFFFF)
RW000 (R000) to RWFF0 (RFFF)
GW000 (G000) to GWFF0 (GFFF)
JW000 (J000) to JWFF0 (JFFF)
QW0000 (Q0000) to QWFFF0 (QFFFF)
EW0400 (E0400) to EWFFF0 (EFFFF)
MW0000 (M0000) to MWFFF0 (MFFFF)
FW000 to FWBFF
LBW0000 to LBWFFF0
LWW0000 to LWWFFFF
LXW0000 to LXW3FFF
5-2
PI/O unit
PI/O input
PI/O output
Number of points
4,096 words (65,536 points)
4,096 words (65,536 points)
256 words (4,096 points)
256 words (4,096 points)
256 words (4,096 points)
4,096 words (65,536 points)
3,072 words (49,152 points)
4,096 words (65,536 points)
3,072 words
8,192 words (131,072 points)
65,536 words
16,384 words