Omron CP1H CPU UNITS - PROGRAMMING 05-2007, Operation Manual

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CompoBus/S I/O Link Units
Section 7-6
The input word (m+1) contains the 8 bits of data from the Master Unit and two
CompoBus/S communications flags.
Write the data to be transmitted to the Master Unit in the output word (n+1).
Note (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.
Determining the Node
Number and Making DIP
Switch Settings 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
PC the Master Unit is mounted to and the settings on the Master Unit. For
details refer to the
CompoBus/S Operation Manual .
Word m+1
15 00
07 08 09
CompoBus/S Communications Error Flag
0: Normal; 1: Error
CompoBus/S Communication Status Flag
0: Stopped; 1: Communicating
Data from the Master Unit
Word n+1
15 00 07
Data to be transferred to the Master Unit