Omron CP1L CPU UNIT - 06-2007 Operation Manual page 491

CompoBus/S I/O Link Units
Note
Determining the Node
Number and Making DIP
Switch Settings
458
The input word (m+1) contains the 8 bits of data from the Master Unit and two
CompoBus/S communications flags.
15
Word m+1
CompoBus/S Communications Error Flag
0: Normal; 1: Error
CompoBus/S Communication Status Flag
0: Stopped; 1: Communicating
Write the data to be transmitted to the Master Unit in the output word (n+1).
15
Word n+1
(1) The 8 bits of I/O data are not always transmitted simultaneously. In other
words, 8 bits of data transmitted from the Master CPU Unit at the same
time will not always reach the Slave CPU Unit simultaneously, and 8 bits
of data transmitted from the Slave CPU Unit at the same time will not al-
ways reach the Master CPU Unit simultaneously.
When the 8 bits of input data must be read together, modify the ladder
program in the CPU Unit receiving the data. For example, read the input
data twice in succession and accept the data only when the two values
match.
(2) Unused bits in the CompoBus/S I/O Link Unit's output word can be used
as work bits, but unused bits in the output slaves cannot be used as work
bits.
(3) Unused bits in input word cannot be used as work bits.
Node Number
• The CompoBus/S I/O Link Unit is a Slave Unit with 8 input bits and 8 out-
put bits. The node number setting is made using the DIP switch; the
inputs and outputs share the same node number.
• The range of possible node number settings is determined by the type of
PLC the Master Unit is mounted to and the settings on the Master Unit.
For details refer to the CompoBus/S Operation Manual.
09 08 07
Data from the Master Unit
07
Data to be transferred to the Master Unit
Section 7-6
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