3 Nomenclature and Functions
3-28
CJ2 CPU Unit Hardware User’s Manual
3-6 CJ-series Basic I/O Units
z Eight/sixteen-point Units (18-point Terminal Blocks)
Note The CJ1W-OD202, CJ1W-OD204, and CJ1W-OD212 also have an ERR indicator for the load short-circuit
alarm.
z Functions
Interrupt Input Units are used to execute interrupt programs on the rising or falling edge of an input
signal. When the specified interrupt input turns ON (or OFF), execution of the cyclic program in the
CPU Unit is interrupted and an I/O interrupt task (task number 100 to 131) is executed. When execu-
tion of the I/O interrupt task has been completed, the cyclic program is again executed starting from
the instruction after which it was interrupted.
3-6-1 Basic I/O Units with Terminal Blocks
Part Names and Functions
Interrupt Input Units
ERR
0 1 2 3 4 5 6 7
8 9 10 11 12 13 14 15
Connector
Connect to the connector on the next Unit.
I/O indicators
Model number label
Terminal block for
I/O wiring, 18P × 1
Interrupt Input Unit
CPU Unit
Input
(rising or
falling
edge)
Immediate
interrupt
1 cyclic task
I/O interrupt task
I/O interrupt task is
executed when the input
turns ON (or OFF).
MSKS
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