383
Data Link Area Section 9-4
Limitations on Output Bits Output bits can be programmed in any order. Output bits can be used as oper-
ands in Input instructions and there is no limit on the number of times that an
output bit is used as a normally open and normally closed condition.
An output bit can be used in only one Output instruction that controls its sta-
tus. If an output bit is used in two or more Output instructions, only the last
instruction will be effective.
Note All outputs on Basic I/O Units and Special I/O Units can be turned OFF by
turning ON the Output OFF Bit (A50015). The status of the output bits won’t
be affected even though the actual outputs are turned OFF.
9-4 Data Link Area
Data Link Area addresses range from CIO 1000 to CIO 1199 (CIO
bits 100000 to 119915). Words in the Link Area are used for data links when
LR is set as the data link area for Controller Link Networks. It is also used for
PLC Links.
A data link automatically (independently of the program) shares data with Link
Areas in other CJ-series CPU Units in the network through a Controller Link
Unit mounted to the PLC’s CPU Rack.
Data links can be generated automatically (using the same number of words
for each node) or manually. When a user defines the data link manually, he
can assign any number of words to each node and make nodes receive-only
or transmit-only. Refer to the Controller Link Units Operation Manual (W309)
for more details.
Words in the Link Area can be used in the program when LR is not set as the
data link area for Controller Link Networks and PLC Links are not used.
Forcing Bit Status Bits in the Data Link Area can be force-set and force-reset.
CIO 000000 is
controlled by CIO
000010.
Only this instruction
is effective.
Controller
Link Unit
CPU Unit
Link Areas
Controller
Link Unit
CPU Unit
Controller
Link Unit
CPU Unit
Controller Link Network
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