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Allocated CIO Area Words Section 3-2
3-2-7 Master Status 1 (Word n+12)
Word n+12 [n = CIO 1,500 + (25 x unit number)]
Bit Name Status Controlled
by
Unit operation
00 Verification
Error Flag
ON Unit Indicates that the data in the slave registered in the scan list is different
from the data from the actual slave. It occurs with the scan list enabled.
OFF Unit Indicates that a verification error has not occurred or turns OFF when a
verification error is cleared.
01 Structure
Error Flag
ON Unit Indicates that I/O allocations cannot be made with the scan list disabled.
OFF Unit Indicates that a structure error has not occurred or turns OFF when a
structure error is cleared.
02 Remote I/O
Communica-
tions Error
Flag
ON Unit Indicates that a remote I/O communications timeout has occurred during
remote I/O communications with slaves.
Remote I/O communications will stop if DIP switch pin 3 (remote I/O com-
munications stop/continue setting for communications errors) on the front
panel is ON (stop).
This error occurs with the scan list enabled or disabled.
OFF Unit Indicates that a remote I/O communications error has not occurred or
turns OFF when a remote I/O communications error is cleared.
03 Reserved by
system
--- --- ---
04 Invalid Scan
List Data
Flag
ON Unit Indicates that there is incorrect data in the scan list (mismatched check-
sum). Remote I/O communications in the Unit will stop. (Slave operations
and message communications will continue.)
OFF Unit Indicates that the scan list data is correct.
Turns OFF when an incorrect scan list data error occurs and then the cor-
rect scan list is registered.
05 Remote I/O
Refresh
Error Flag
ON Unit Indicates that the I/O memory in the CPU Unit that is to be refreshed is not
present during I/O refreshing for the master. It occurs in several situations,
such as when an I/O area is allocated in an EM bank that is not present.
OFF Unit Indicates that no master I/O refresh errors have occurred.
06
to
07
Reserved by
system
--- --- ---
08 Master
Function
Enable/
Disable
Failed Flag
ON Unit Indicates that an error has occurred in one of the following operations:
• Master enable (word n, bit 06)
• Master stop (word n, bit 07)
Once this bit turns ON, it will remain ON until the operation is successfully
completed.
OFF Unit Indicates that the error has not occurred. The bit turns OFF when the
operation is successfully completed.
09 User
Allocation
Area Setting
Failed Flag
ON Unit Indicates that an error has occurred in one of the following operations:
• Master user-set allocations user setting (word n, bit 11)
Once this bit turns ON, it will remain ON until the operation is successfully
completed.
Details on the master user-set allocation results are output to the Master
User Allocations Setup Table.
OFF Unit Indicates that the error has not occurred. The bit turns OFF when the
operation is successfully completed.