Delta AH500 Programming Manual page 314

AH 5 00 Pr ogr am m ing Ma n ua l
The program Cyclic_0:
The interrupt task:
Additional remark:
There are 256 interrupt tasks, i.e. task I0~task I255.
1. The I/O interrupts (I0~I31)
The I/O interrupts are used by the special high-speed module. The interrupt conditions and the
interrupt numbers are set in HWCONFIG in ISPSoft, and the interrupt programs are
downloaded to the PLC. If the interrupt conditions are satisfied when the PLC runs, the
corresponding interrupt programs will be executed.
2. The communication interrupts (I32 and I33)
The communication interrupt can be used as the instruction RS, that is, the receiving of the
specific character triggers the interrupt, or can be used as the general interrupt.
Please refer to the explanation of the instruction RS for more information.
COM1: I32
COM2: I33
3. 24 V low voltage interrupt
Whether the external 24 V voltage is normal can be checked by the terminals VS+ and VS- on
AH500PS05-5A. If the external 24 V voltage is abnormal, users can execute the corresponding
program by means of the interrupt subroutine I34.
Note: If the external 24 V voltage of a backplane is abnormal, the corresponding bit in SR731
will be set to ON. After the external 24 V voltage of the backplane returns to normal, the
bit will be set to OFF. The high 8 bits in SR731 are reserved bits.
SR731
Reserved bits
For example:
(a) If the external 24 V voltage of the local main backplane is abnormal, bit 0 in SR731 will be
6 - 1 4 6
Bit 15 ~8 Bit 7
Bit 6 Bit 5 Bit 3 Bit2
Bit 4
For the backplanes
Bit1 Bit0