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Allocated CIO Area Words Section 3-2
3-2-8 Master Status 2 (Word n+13)
The leftmost eight bits indicate the status of master I/O allocations.
Master I/O Allocation Status
10 Fixed
Allocation
Area Setting
Failed Flag
ON Unit Indicates that an error has occurred in one of the following operations:
• Fixed Allocation Setting 1 (word n, bit 08)
• Fixed Allocation Setting 2 (word n, bit 09)
• Fixed Allocation Setting 3 (word n, bit 10)
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.
11 Scan List
Register/
Clear Failed
Flag
ON Unit Indicates that an error has occurred in one of the following operations:
• Scan list enabled (word n, bit 00)
• Scan list clear (word n, bit 01)
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.
12 Communica-
tions Cycle
Time
Setting
Failed Flag
ON Unit Indicates that an error has occurred when setting the communications
cycle time (word n, bit 12).
Once this bit turns ON, it will remain ON until the next communications
cycle time is set.
OFF Unit Indicates that the error has not occurred. The bit turns OFF when the
operation is successfully completed.
13
to
14
Reserved by
system
--- --- ---
15 I/O Data
Communica-
tions Flag
ON Unit Indicates that at least one slave is performing remote I/O communications.
Usage example: When writing the ladder program for remote I/O commu-
nications, set a NO input condition for this bit to control slave I/O process-
ing.
OFF Unit Indicates that remote I/O communications are not being conducted with
any slaves.
Bit Name Status Controlled
by
Unit operation
Code Details
00 Hex Unit starting up
01 Hex Fixed allocation status 1 (with the scan list disabled)
02 Hex Fixed allocation status 2 (with the scan list disabled)
03 Hex Fixed allocation status 3 (with the scan list disabled)
11 Hex Fixed allocation status 1
12 Hex Fixed allocation status 2
13 Hex Fixed allocation status 3
20 Hex User-set allocations in the allocated DM Area words
30 Hex User-set allocations from the Configurator
80 Hex Master function disabled
Word
Bit 15 Bit 08 Bit 07 Bit 00
Master I/O Allocation Status
Reserved by system
n+13