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3-3
Section
CompoBus/S I/O Link Units
215
Item
Specification
Model number
CPM1A or CPM2A:
CPM1A-SRT21
CPM2C or CPM2C-S :
CPM2C-SRT21
Master/slave
CompoBus/S Slave
Number of I/O points
8 input points, 8 output points
Number of words allocated
in CPU Unit I/O memory
1 input word, 1 output word
(Allocated in the same way as Expansion I/O Units
and other Expansion Units)
Node number setting
Set using the DIP switch
(Set before turning on the CPU Unit’s power supply.)
Current consumption
50 mA
Indicator
Status
Meaning
COMM
(
ll
)
ON
Communications in progress.
(yellow)
OFF
Communications stopped or error has occurred.
ERR
( d)
ON
A communications error has occurred.
(red)
OFF
Indicates normal communications or stand-by.
Usage Procedure
Connect the Unit.
Determine the node address of
the CompoBus/S I/O Link Unit and
set the DIP switch.
Wire the CompoBus/S transmission
path.
Connect the CompoBus/S I/O Link Unit.
The node number should be a unique number between 0 and 15.
Use the DIP switch to set the CompoBus/S I/O Link Unit’s node
number, communications mode, and the status of output data
when a communications error occurs.
Connect the CompoBus/S I/O Link Unit to a CompoBus/S
transmission path.
Connect the CompoBus/S I/O Link Unit to the CPU Unit. The number of Compo-
Bus/S I/O Link Units that can be connected depends on the PC. Three Units can
be connected to the CPM1A/CPM2A, five Units can be connected to the
CPM2C, and three Units can be connected to the CPM2C-S. When Expansion
I/O Units or other Expansion Units are also connected, they can be connected in
any order from the CPU Unit.
CPM2C or
CPM2C-S
CPU Unit
CompoBus/S I/O
Link Unit
CPM1A/CPM2A CPU Unit
CPM1A-SRT21
CompoBus/S
I/O Link Unit
I/O Allocation
I/O words are allocated to the CompoBus/S I/O Link Unit in the same way as
Expansion I/O Units or other Expansion Units, the next available input and out-
put words are allocated. When “m” is the last allocated input word and “n” is the
Specifications
LED Indicators
Connecting the
CompoBus/S I/O Link
Unit