JP2573240B2 - Sequencer interrupt unit - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an interrupt unit for a sequencer.

[Background Art] FIG. 2 shows a circuit block configuration of a general sequencer interrupt unit.
₁ and photocoupler 1 ₁ to 1 _n each associated with to IN _n, the photocoupler 1 ₁ to 1 and flip-flop 2 ₁ to 2 _n to latch the input signal at the output of _n, Q of these flip-flops 2 ₁ to 2 _n It is constituted by a NOR gate 3 that takes the NOR of the output, and when an input signal enters _{one of} the input terminals IN _{1 to} IN _n ,
The corresponding flip-flop inverts the Q output and generates an interrupt signal to the CPU unit 4 of the sequencer through the NOR gate 3. When the CPU unit 4 detects this interrupt signal ▲ ▼, it interrupts the operation currently being executed, immediately reads the Q output of the corresponding flip-flop as the interrupt data D, searches for the interrupt input, and executes a pre-programmed interrupt processing sequence. Run the program.

However, many such interrupters for sequencers generally have 16 to 32 input terminals, and if all inputs are not used for interrupt programs, there is no other use and occupies the number of I / O points. However, there is a disadvantage that unused inputs are increased.

[Object of the Invention] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide an interrupt input unit for a sequencer that can use an unused input as an interrupt input as a general input. is there.

DISCLOSURE OF THE INVENTION The present invention is provided with a plurality of input terminals, a plurality of latch means provided corresponding to each input terminal, and a latch means for latching an input signal when the input terminal has an input signal, and a plurality of latch means corresponding to each input terminal. A data selector that selects and outputs data to be output from an input signal of an input terminal or a latch output of a corresponding latch means, and an interrupt if there is a latch output corresponding to an input signal of any of the latch means. And a gate means for generating a signal. When the input signal is taken in as an interrupt input, the data selector is set so that the data output from the data selector becomes a latch output of the latch means. When capturing data, set the data selector so that the data output by the data selector becomes an input signal and clear the latch means. The present invention is characterized in that it comprises a setting means for setting the state.

 Hereinafter, the present invention will be described with reference to examples.

Example Figure 1 shows a circuit configuration of embodiment of the present invention, in this embodiment is provided with a data selector 5 ₁ to 5 _n are respectively corresponding to the flip-flop 2 ₁ to 2 _n. These data selector 5 ₁ to 5 _n is connected to the Q output of the flip-flop 2 ₁ to 2 _n corresponding to the B data input terminal, and connect the output of the photocoupler 1 ₁ to 1 _n corresponding to the A data input , Sequencer CP
Depending on the select data S from the U unit 4, the Y output terminals, or the output of the photocoupler 1 ₁ to 1 _n, the flip-flop
It outputs 2 _{1 to} 2 _n Q outputs.

When used as an interrupt input unit, the CPU unit 4 outputs "H" selector data S for selecting the B data input terminal to the data selector 5 corresponding to the input terminal IN used for interrupt.

Therefore, when there is an interrupt input which is a digital signal at any of the input terminals IN and the input falls, the output of the corresponding photocoupler 1 rises, the Q output of the corresponding flip-flop 2 is inverted, and the interrupt signal を 通 じ て▼ is output, and the CPU unit 4 stops the currently executing work when the interrupt signal ▲ ▼ is input,
The Q output of the flip-flop 2 input through the data selector 5 corresponding to the input signal, that is, the interrupt data D is read to search for an interrupt input.

Since the flip-flop 2 holds the Q output until the clear signal CLR is input, the Q output is not inverted even if the input of the input terminal IN returns to the original state, and the interrupt state is maintained. In this case, the A and B inputs of the data collector 5 are different.

Next, when the input is not used as an interrupt input but is generally used for an input state, the input terminal of the data selector 5 provided corresponding to the input terminal is selected as the A data input terminal side. Selector data S of CPU
The data is supplied from the unit 4 to the data selector 5. In this case, since the selector data S of “L” becomes the clear signal ▲ ▼ of the corresponding flip-flop 2, even if the corresponding photocoupler 1 is driven due to the input signal, the Q output is not inverted. Signal ▲ ▼
Is not output, and no interrupt request to the CPU unit 4 is made. Then, the output of the corresponding photocoupler 1 is output to the CPU unit 4 through the data selector 5.

In this embodiment, the CPU unit 4 is used as the setting means for setting the data selection of the data selectors 5 ₁ ..., And the select data S is generated from the CPU unit 4. However, the data selectors 5 ₁ . May be set individually.

[Effects of the Invention] The present invention is provided with a plurality of input terminals, a plurality of latch means provided corresponding to each input terminal, and a plurality of latch means for latching an input signal when there is an input signal at the input terminal, and a plurality of latch means corresponding to each input terminal. A data selector that selects and outputs data to be output from an input signal of an input terminal or a latch output of a corresponding latch means, and an interrupt if there is a latch output corresponding to an input signal of any of the latch means. And a gate means for generating a signal. When the input signal is taken in as an interrupt input, the data selector is set so that the data output from the data selector becomes a latch output of the latch means. When capturing data, set the data selector so that the data output by the data selector becomes an input signal and clear the latch means. With the setting means for setting the state, the desired input terminal can be used as an interrupt input or can be used as a general input, so that the input terminal can be used without waste, and the use efficiency is high. In addition, since the interrupt input and the general-purpose input are used in common, there is an effect that the space for arranging the units can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram of an embodiment of the present invention, and FIG. 2 is a circuit diagram of a conventional example. IN ₁ ~IN _n ...... input terminal, ₁ 1 ~1 _n ...... photocoupler, 2 ₁ ~2 _n
…… Flip-flop, 3… NOR gate, 4… CPU
Units, a 5 ₁ ~5 _n ...... data selector.

Claims (1)

(57) [Claims] 1. A plurality of input terminals, a plurality of latch means provided corresponding to each input terminal, and a plurality of latch means for latching an input signal if the input terminal has an input signal, and a plurality of latch means provided corresponding to each input terminal. , A data selector that selects and outputs data to be output from an input signal of an input terminal or a latch output of a corresponding latch means, and generates an interrupt signal if there is a latch output corresponding to an input signal of any of the latch means. And a gate means for setting the data selector so that the data output from the data selector becomes the latch output of the latch means when capturing an input signal as an interrupt input, and capturing the input signal as a normal input. The data selector is set so that the data output from the data selector becomes an input signal, and the latch means is set to the clear state. Sequencer for interruption unit, characterized in that it comprises means.