Data Areas
Appendix E
354
Dedicated Bits
Most of the bits in the SR and AR area are dedicated for specific purposes. These are summarized in the fol-
lowing tables. Refer to
3-4 SR Area
and
3-5 AR Area
for details.
SR Area
As a rule, SR area bits can be used only for the purposes for which they are dedicated. SR 237 through SR
251 can be used as work bits if the Systems for which they are intended are not used in the PC System.
Word(s)
Bit(s)
Function
237
00 to 07
Completion code output area following execution of
SEND(90)/RECV(98) for SYSMAC LINK System
08 to 15
Not used
238 to 241
00 to 15
Data link status output area for operating level 0 of
SYSMAC LINK or SYSMAC NET Link System
242 to 245
00 to 15
Data link status output area for operating level 1 of
SYSMAC LINK or SYSMAC NET Link System
246
00 to 15
Not used
247 to 250
00 to 07
PC Link Unit Run Flags or data link status for operating
level 1
08 to 15
PC Link Unit Run Flags or data link status for operating
level 1
251
00 to 15
Remote I/O Error Flags
252
00 and 01
Not used
02
Operating Level 0 Data Link Operating Flag
03
SEND(90)/RECV(98) Error Flag
04
SEND(90)/RECV(98) Enable Flag
05
Operating Level 1 Data Link Operating Flag
06
Rack-mounting Host Link Unit Level 1 Error Flag
08
CPU-mounting Host Link Unit Error Flag
09
CPU-mounting Host Link Unit Restart Bit
10
Leave set to 0
12
Data Retention Control Bit
13
Rack-mounting Host Link Unit Restart Bit
14
Leave set to 0
15
Output OFF Bit
253
00 to 07
FAL number output area.
08
Low Battery Flag
09
Cycle Time Error Flag
10
I/O Verification Error Flag
11
Rack-mounting Host Link Unit Level 0 Error Flag
12
Remote I/O Error Flag
13
Normally ON Flag
14
Normally OFF Flag
15
First Cycle