AH500 Hardware and Operation Manual
(3) After the users click CH0~3 number of interrupt setting, they can type interrupt numbers in the Initial
cells. If the number of pulses received by a channel is the same as the comparison value set for the
channel, the corresponding I/O interrupt will be executed. However, if no POU is assigned to the I/O
interrupt, or the POU assigned to the I/O interrupt is not downloaded to the special high-speed module, an
error will occur in the special high-speed module.
8.2.4 Low Voltage Detection Interrupt
The terminals VS+ and VS- on AHPS05-5A can check whether the external voltage is 24 volts. If the external
voltage is abnormal, the interrupt subroutine I34 will be executed.
Note: If the voltage supplied to a backplane is abnormal, the corresponding bit in SR731 will be set to ON.
After the external voltage supplied to the backplane returns to normal, the bit will be set to OFF. Bit 0~bit
7 in SR731 are for backplanes. The remaining bits in SR731 are reserved bits.
SR731
Bit 0
Bit 1Bit 2
Bit 3
Bit 4
Bit 5
Bit 6
Bit 7
Bit 15 ~ 8
Reserved
bits
Main backplane
First extension backplane
S
econd extension backplane
First extension backplane
First extension backplane
First extension backplane
First extension backplane
First extension backplane
8.2.5 Communication Interrupts
A communication interrupt can be used as the instruction RS, that is, the reception of a specific character
triggers a communication interrupt. A communication interrupt can also be used as a general interrupt. Please
refer to AH500 Programming Manual for more information about the instruction RS.
COM1: I32
COM2: I33
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