25
If the content of bits 12 through 15 is B, an error has occurred in a Remote
I/O Master or Slave Unit, and the content of bits 08 through 11 will indicate
the mounting order of the Master of the Remote I/O Subsystem involved.
These numbers are assigned to Masters in the order that they are mounted
to the CPU and Expansion I/O Racks. If the error is in the Master, bit 7 will be
ON. If the error is in a Slave, bit 07 will be OFF, and bits 04 through 06 will
provide the unit number of the Slave where the error occurred.
If the content of bits 12 through 15 is other than B, an error has occurred in
an Optical I/O Unit, I/O Link Unit, or Remote Terminal. Here, bits 08 through
15 will provide the word address that has been set on the Unit and bits 05
and 06 will provide the word multiplier of the Master of the Remote I/O Sub-
system to which the Unit belongs. The word address setting and word multi-
plier can be used to find the actual word allocated to the Unit as follows:
Allocated word = Word s (word multiplier x 32)
When this Unit is an Optical I/O Unit, bit 04 will be ON if the Unit is assigned
leftmost word bits (08 through 15), and OFF if it is assigned rightmost word
bits (00 through 07).
Host Link Systems
Both Error flags and Restart bits are provided for Host Link Systems. Error
flags turn ON to indicate errors in Host Link Units. Restart bits are turned ON
and then OFF to restart a Host Link Unit. SR bits used with Host Link Sys-
tems are summarized in the following table.
Rack-mounting Host Link Unit
Restart bits are not effective for the Multilevel Rack-mounting Host Link
Units.
Refer to the
Host Link System Manual
for details.
Flag
Bit
Rack-mounting Host Link Unit Level 1 Error Flag
25206
CPU-mounting Host Link Unit Error Flag
25208
CPU-mounting Host Link Unit Restart Bit
25209
Rack-mounting Host Link Unit Restart Bit
25213
Rack-mounting Host Link Unit Level 0 Error Flag
25311
SYSMAC NET Link and SYSMAC LINK Systems
SR 25203 turns ON when an error has occurred in data communications us-
ing SEND(90) or RECV(98) to transfer data in either a SYSMAC NET Link or
SYSMAC LINK System and SR 25204 is ON when SEND(90) or RECV(98)
are enable in these Systems. SR 25202 turns ON when a data link is active
in operating level 0 of either of these Systems and SR 25205 turns ON with a
data link is active in operating level 1. These flags and corresponding SR bits
are shown below.
Bit
Flag
25202
Operating Level 0 Data Link Operating Flag
25203
SEND(90)/RECV(98) Error Flag
25204
SEND(90)/RECV(98) Enable Flag
25205
Operating Level 1 Data Link Operating Flag
When SEND(90) or RECV(98) is used in a SYSMAC LINK System, a com-
pletion code is output to SR 23700 through SR 23707a to indicate whether or
not the data transfer was completed successfully or not and to indicate the
nature of the error when communications are not completed successfully.
These error codes are as follows.
Bits 04 to 15
SYSMAC LINK
Communications
Completion Code
SR Area
Section 3-4
