JP2784039B2 - Programmable controller - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a programmable controller.

[Prior Art] In a conventional programmable controller with a forced set / reset function, during a test or the like, a forced set / force reset command for fixing an input or an output to an on or off state from a peripheral device through a communication means during a calculation is given. You can do it.

[Problems to be Solved by the Invention] By the way, when the peripheral device is disconnected from the programmable controller in the forced processing state, the programmable controller remains in the forced processing state, and the user sets the flag during the forced setting inside the programmable controller by the sequence program, and the forced reset. Unless the middle flag is output by an instruction to output to the output unit, it cannot be determined at first glance from the outside that it is in the forced processing state.

When such a situation occurs, it causes an illusion that the sequence program is not operating as expected, etc.
There was a problem that caused confusion in the test state.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and it is possible to make a display unit recognize that a forced processing state is being performed, thereby preventing confusion after a forced processing at the time of a test or the like. It is an object to provide a programmable controller.

[Means for Solving the Problems] The present invention includes a display unit that displays during calculation and during calculation stop, and forcibly sets inputs and outputs to a set or reset state by a command from a peripheral device during calculation. The invention according to claim 2, wherein the programmable controller having a processing function is provided with means for blinking the in-completion display on the display unit at a constant cycle in a forced set or reset state. There is also provided a means for sounding a buzzer in a forced set or reset state.

[Operation] According to the present invention, during the forcible processing, the in-computation display on the display unit blinks, so that even if the operation by the forcible processing is performed, an unexpected operation is not illusioned.

In particular, since the buzzer also sounds according to the second aspect of the present invention, the user can be surely recognized by eyes and ears that forced processing is being performed.

[Embodiment] FIG. 1 shows an overall configuration diagram of an embodiment of the present invention.
An operation processing unit 1 including a CPU for performing signal processing and control processing of the entire programmable controller stores a system operation program through a bus line 2.
A ROM 3, a RAM 4 for writing and reading a user sequence program and other data, a communication port 5, and an I / O port 6 are connected. The communication port 5 is connected to a peripheral device 7 for giving a forced set instruction or a forced set instruction to the arithmetic processing unit 1. The I / O port 6 is an operation switch 8 required for operating the programmable controller. An input / output interface 9 for exchanging input / output signals with an external device and a display unit 10 for displaying operation information of the programmable controller are connected.

Next, the operation of the programmable controller of the present invention at the time of forced processing will be described with reference to the flowcharts of FIGS.

First, the arithmetic processing unit 1 reads out the state of the operation switch 8 in the step of FIG.
Is performed, and in the step, if there is a forced set command or a forced reset command of the output from the peripheral device 7,
Forcible processing is performed. In the step, input / output refresh processing is performed. In the step, if there is a forced input command or a forced reset command from the peripheral device 7, the forced processing is performed. In the step, whether the operation mode is set or not is determined. If the operation mode is determined to be the calculation mode, the processing operation is returned to the step after performing the calculation in the step. Otherwise, the processing operation is returned to the step without passing the step.

By the way, in the step, the processing shown in FIG. 3 is performed. First, the arithmetic processing unit 1 reads the operation state of the operation switch 8 to determine whether or not the operation mode is set to the arithmetic mode. If so, the light emitting diode of the display unit 10 is lit to indicate that the calculation is being performed. If the operation mode is not the operation mode, the fact that the operation is stopped is displayed by lighting the corresponding light emitting diode of the display unit 10. After this display, it is determined whether or not the forced processing is being performed. Whether or not the forced processing flag is written in the predetermined area M of the RAM 4 is determined. If M = 1, it is determined that the forcible processing is being performed, and the lighting of the light emitting diode, which is displayed during calculation, is controlled to be turned on and off at regular intervals.
That is, in the embodiment, the light emitting diode of the display during calculation is blinked in a one second cycle using the one second clock relay of the programmable controller.

The forcible flag is set by writing "1" in a predetermined area of the RAM 4 when a forced reset command or a forced set command for an input, output or timer or counter is given.

Thus, the programmable controller of the present invention can make the user recognize that the forced processing is being performed by blinking the light emitting diode of the display during calculation at a constant cycle, thereby causing an illusion of unexpected operation. Absent.

In addition, if the buzzer 11 is arranged in parallel with the on / off display of the light emitting diode and the buzzer 11 sounds to indicate to the user that the forcible operation is being performed, the user can recognize with the eyes and ears, so that oversight does not occur. In this case, buzzer 11
If it sounds, it is annoying, so it may be made to sound only when the light emitting diode blinks in a fixed cycle. Alternatively, the buzzer may be sounded only at the moment when the blinking light emitting diode is “disappeared” to reverse the lighting of the light emitting diode.

Further, if a two-color diode is used as the light emitting diode, for example, red light is displayed for the display during calculation and green light is displayed for the display during forced processing, the discriminating power is increased as compared with a simple blinking. Also, there is no mounting problem because it is the same as the one-color light emitting diode.

[Effects of the Invention] The present invention includes a display unit that displays during calculation and when calculation is stopped, and has a forced processing function that forcibly sets inputs and outputs to a reset state by instructions from peripheral devices during calculation. The programmable controller has means for blinking the in-operation display of the display unit at a constant cycle in the forced set / reset state, so that the number of display portions is increased without forming a user program. During forced processing, the display of the calculation in progress on the display unit can be made to blink, and this blinking makes it easy for the user to recognize that the forced processing is being performed. However, it is possible to eliminate the illusion of an unexpected operation, and as a result, it is possible to carry out an efficient and reliable test.

In particular, since the invention according to claim 2 is provided with a means for sounding a buzzer at the time of a forced set / reset state, the buzzer is also sounded. Thus, there is an effect that the user can be recognized.

[Brief description of the drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIGS. 2 and 3 are flowcharts for explaining the operation of the embodiment. 1 is an arithmetic processing unit, 7 is a peripheral device, 10 is a display unit, and 11 is a buzzer.

Claims (2)

(57) [Claims] 1. A programmable controller having a display unit for displaying during calculation and when calculation is stopped, and a forced processing function for forcibly setting an input or output to a reset state by an instruction from a peripheral device during calculation. 2. The programmable controller according to claim 1, further comprising: means for blinking the in-completion display on the display unit at a constant period in a forced set / reset state. 2. The programmable controller according to claim 1, further comprising means for sounding a buzzer in a forced set / reset state.