391
Special Instructions Section 5-28
Flags ER: T is not BCD.
C is not a constant or is not BCD 00 to 99.
Indirectly addressed EM/DM word is non-existent.
(Content of *EM/*DM word is not BCD, or the EM/DM area boundary
has been exceeded.)
CY: ON when the time between the execution of FPD(––) and the execu-
tion of a diagnostic output exceeds T.
5-28-8 INTERRUPT CONTROL – INT(89)
Limitations DM 6644 to DM 6655 cannot be used for D when CC=002.
Description When the execution condition is OFF, INT(89) is not executed. When the exe-
cution condition is ON, INT(89) is used to control interrupts and performs one
of the six functions shown in the following table depending on the value of CC.
Note Refer to 1-4 Interrupt Functions for more details.
These six functions are described in more detail below. Refer to page 44 for
more information on these functions.
Mask/Unmask I/O
Interrupts (CC=000)
This function is used to mask and unmask I/O interrupt inputs 00000 to
00003. Masked inputs are recorded, but ignored. When an input is masked,
the interrupt program for it will be run as soon as the bit is unmasked (unless
it is cleared beforehand by executing INT(89) with CC=001).
HR 10 0000
HR 11 0000
HR 12 0000
HR 13 0000
HR 14 0000
HR 15 4142
HR 16 430D
HR 17 0000
HR 18 0000
HR 10 C000 Indicates information, normally closed condition
HR 11 2031 "1"
HR 12 3030 "00"
HR 13 3032 "02"
HR 14 2D31 "−1"
HR 15 4142 "AB"
HR 16 430D "C", and CR code
HR 17 0000 The last two words are ignored.
HR 18 0000 (Displayed as spaces.)
Ladder Symbols
INT(89)
CC
000
D
@INT(89)
CC
000
D
CC: Control code
# (000 to 003, 100, or 200)
000: No function
# (000)
Operand Data Areas
D: Control data
IR, SR, AR, DM, EM, HR, TIM/CNT, LR, TR, #
INT(89) function CC
Mask/unmask input interrupts 000
Clear input interrupts 001
Read current mask status 002
Renew counter SV 003
Mask all interrupts 100
Unmask all interrupts 200
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