195
Interrupt Tasks Section 4-3
The following table shows the corresponding settings when using a Program-
ming Console.
Related Auxiliary Area Flags/Words
Disabling Interrupts Processing will be interrupted and the interrupt task will be executed in the fol-
lowing instances.
• While an instruction is being executed
• During Basic I/O Unit, CPU Bus Unit, Inner Board (CS Series only), or
SYSMAC BUS remote I/O (CS Series only) refreshing
• During HOST LINK servicing
Data Concurrency
between Cyclic and
Interrupt Tasks
Data may not be concurrent if a cyclic (including extra cyclic tasks) and an
interrupt task are reading and writing the same I/O memory addresses. Use
the following procedure to disable interrupts during memory access by cyclic
task instructions.
• Immediately prior to reading or writing by a cyclic task instruction, use a
DI (DISABLE INTERRUPT) instruction to disable execution of interrupt
tasks.
• Use an EI (ENABLE INTERRUPT) instruction immediately after process-
ing in order to enable interrupt task execution.
Programming
Console
address
Name Description Settings Default
setting
Word +128,
bit 14
Interrupt Task Error
Detection
Specifies whether or not to detect interrupt
task errors. The Interrupt Task Error Flag
(A40213) will be function when detection is
enabled.
0: Detection
enabled,
1: Detection
disabled
0
Name Address Description
Interrupt Task Error
Flag
A40213 Turns ON if an interrupt task executes for more than 10 ms during
C200H Special I/O Unit or SYSMAC BUS Remote I/O refresh, but the
CPU Unit will continue running. The ERR/ALM LED will light on the
front panel (CS Series only).
Also turns ON if Interrupt Task Error Detection is enabled for a Special
I/O Unit in the PLC Setup, and one of the following conditions occurs for
that Special I/O Unit.
• There is a conflict between an IORF, FIORF (CJ1-H-R only), IORD,
or IOWR instruction executed in the interrupt task and an IORF,
FIORF (CJ1-H-R only), IORD, or IOWR instruction executed in the
cyclic task.
• There is a conflict between an IORF, FIORF (CJ1-H-R only), IORD,
or IOWR instruction executed in the interrupt task and the CPU
Unit’s I/O refreshing (END refreshing).
Note When a Special I/O Unit’s Cyclic Refreshing is enabled in the PLC Setup,
and an IORF, FIORF (CJ1-H-R only), IORD, or IOWR instruction is exe-
cuted for the same Special I/O Unit, there will be duplicate refreshing and
an Interrupt Task Error will occur.
Interrupt Task Error,
Task Number
A426 Contains the interrupt task number or the number of the Special I/O
Unit being refreshed.
(Bit 15 will be OFF when execution of an interrupt task requires 10 ms
or longer and ON when duplicated Special I/O Unit refreshing has
occurred.)
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