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23
Table Change operation must be performed after the I/O Table Registration
operation, otherwise all word reservations will be cancelled, and I/O Table
Change will have to be repeated.
3-4
SR (Special Relay) Area
The SR
area contains flags and control bits used for monitoring PC opera-
tion, accessing clock pulses, and signalling errors. SR area word addresses
range from 247 through 255; bit addresses, from 24700 through 25515.
The following table lists the functions of SR area flags and control bits. Most
of these bits are described in more detail following the table. Descriptions are
in order by bit number except that Link System bits are grouped together.
Unless otherwise stated, flags are OFF until the specified condition arises,
when they are turned ON. Restart bits are usually OFF, but when the user
turns one ON then OFF, the specified Link Unit will be restarted. Other con-
trol bits are OFF until set by the user.
SR bits 25209 through 25215 are all control bits. They can be turned ON and
OFF from the program, i.e., they can be manipulated with the OUTPUT and
OUTPUT NOT instructions. Any of these bits not assigned specific functions
should be left OFF. Bits in words SR 237 through SR 251, only, can be used
as work bits if the Systems for which these bits are dedicated are not used by
the PC.
Word(s)
Bit(s)
Function
237
00 to 07
Completion code output area following execution of SEND(90)/RECV(98) for SYSMAC LINK
System or NET 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 Error 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
07
Not used.
08
CPU-mounting Host Link Unit Error Flag
09
CPU-mounting Host Link Unit Restart Bit
10
Leave set to 0.
11
Not used.
12
Data Retention Control Bit
13
Rack-mounting Host Link Unit Restart Bit
14
Leave set to 0.
15
Output OFF Bit
SR Area
Section 3-4
Содержание SYSMAC C1000H
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