IDEC microsmart pentra, Programming Manual

Page: 199 / 344

FT1A S
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ANUAL
FT9Y-B1382 16-1
16: I
NTERRUPT
C
ONTROL
I
NSTRUCTIONS
Introduction
The DI or EI instruction disables or enables interrupt inputs and timer interrupt individually.
DI (Disable Interrupt)
EI (Enable Interrupt)
Applicable CPU Modules
Valid Devices
Interrupt inputs I0 through I7 and timer interrupt selected in the Function Area Settings are normally enabled when the CPU starts. When the DI
instruction is executed, interrupt inputs and timer interrupt designated as source device S1 are disabled even if the interrupt condition is met in the
user program area subsequent to the DI instruction. When the EI instruction is executed, disabled interrupt inputs and timer interrupt designated as
source device S1 are enabled again in the user program area subsequent to the EI instruction. Different interrupts can be selected for the DI and EI
instructions to disable and enable interrupt inputs selectively. For Interrupt Input and Timer Interrupt, see pages 5-34 and 5-36 (Basic Vol.).
Make sure that interrupt inputs and timer interrupt designated as source device S1 are selected in the Function Area Settings. Otherwise, when the
DI or EI instruction is executed, a user program execution error will result, turning on special internal relay M8004 and the ERR LED on the CPU
module.
The DI and EI instructions cannot be used in an interrupt program. If used, a user program execution error will result, turning on special internal
relay M8004 and the ERR LED on the CPU module. For details about the user program execution errors, see Chapter 4 “User Program Execution
Errors” on page 4-21.
Special Internal Relays M8070-M8075 and M8144: Interrupt Status
Special internal relays M8070 through M8075 and M8144 are provided to indicate whether interrupt inputs and timer interrupt are
enabled or disabled.
When input is on, interrupt inputs and timer interrupt designated by source device S1 are disabled.
DI S1
**
When input is on, interrupt inputs and timer interrupt designated by source device S1 are enabled.
EI S1
**
FT1A-12 FT1A-24 FT1A-40 FT1A-48 FT1A-Touch
X X X X X
Device Function I Q M R T C D Constant Repeat
S1 (Source 1) Interrupt inputs and timer interrupt — — — — — — — 1-127 —
Interrupt Interrupt Enabled Interrupt Disabled
Interrupt Input I0 M8070 ON M8070 OFF
Interrupt Input I2 M8071 ON M8071 OFF
Interrupt Input I3 M8072 ON M8072 OFF
Interrupt Input I5 M8073 ON M8073 OFF
Interrupt Input I6 M8074 ON M8074 OFF
Interrupt Input I7 M8075 ON M8075 OFF
Timer Interrupt M8144 ON M8144 OFF