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Allocated CIO Area Words Section 3-2
3-2-5 Unit Status 1 (Word n+10)
Word n+10 [n = CIO 1,500 + (25 x unit number)]
Bit Name Status Controlled
by
Unit operation
00 Unit Error
Flag
ON Unit Displays DeviceNet Unit operating errors.
This bit turns ON if any bit from 01 to 15 in Unit Status 1 turns ON. (OR of
bits 01 to 15)
Usage example: When writing the ladder program for remote I/O commu-
nications, set a NC input conditions for this bit to control Slave I/O pro-
cessing.
OFF Unit Indicates that the an error has not occurred or turns OFF when the error
has cleared.
01 Master
Function
Error Flag
ON Unit Indicates that a master error has occurred. (Master Status 1 (See word
n+12.))
The master errors are as follows:
• Verification Error Flag (word n+12, bit 00)
• Structure Error Flag (word n+12, bit 01)
• Remote I/O Communications Error Flag (word n+12, bit 02)
• Invalid Scan List Data Flag (word n+12, bit 04)
• Remote I/O Refresh Error Flag (word n+12, bit 05)
OFF Unit Indicates that the error has not occurred or turns OFF when the error has
been cleared.
02 Reserved by
system
--- --- ---
03 Slave Func-
tion Error
Flag
ON Unit Indicates that a slave error has occurred. (Slave Status 1 (See word
n+14.))
The slave errors are as follows:
• Remote I/O Communications Error Flag for OUT 1/ IN 1 (word n+14, bit
02)
• Remote I/O Communications Error Flag for OUT 2/ IN 2 (word n+14, bit
03)
• Invalid Setup Data Flag (word n+14, bit 04)
• Remote I/O Refresh Error Flag (word n+14, bit 05)
OFF Unit Indicates that the error has not occurred or turns OFF when the error has
been cleared.
04 Unit Mem-
ory Error
Flag
ON Unit Indicates an error in internal memory where the error history is stored.
(The error occurs when the Unit starts up or when the error history is writ-
ten.)
OFF Unit Indicates that the error has not occurred. Once this error has occurred, the
bit will remain ON and will not return to OFF.
05 Bus Off Flag ON Unit Indicates that a Bus OFF error (communications were stopped by multiple
transmissions) has occurred. When a Bus OFF occurs, the Unit goes
offline and all communications stop (remote I/O communications stop,
slave operation stop, and message communications are disabled).
OFF Unit Indicates that the error has not occurred. Once this error has occurred, the
bit will remain ON and will not return to OFF.
06 Node
Address
Duplicated
Flag
ON Unit Indicates a duplicate node address check error when the Unit starts up.
The Unit goes offline and all communications stop. (Remote I/O communi-
cations stop, slave operation stop, and message communications are dis-
abled.)
OFF Unit Indicates that the error has not occurred. Once this error has occurred, the
bit will remain ON and will not return to OFF.