JP3550906B2 - PLC remote I / O unit - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a remote I / O unit of a sequencer that controls an input device / output device (I / O device) as a control device via a remote input / output (I / O) unit.
[0002]
[Prior art]
Conventionally, in a sequencer that controls an I / O device via a remote I / O station (remote I / O unit), output data sent from a higher-order sequencer via the remote I / O unit and sent from an input device. A display unit for displaying input data is provided.
[0003]
In general, an LED (light emitting diode) is hard-lit in an input stage or an output stage circuit for exchanging signals with an I / O device.
[0004]
[Problems to be solved by the invention]
However, since the remote I / O unit is often incorporated in a housing such as a control panel and the display unit is hidden, input / output data and various alarms cannot be easily confirmed . If you want to check the input and output data and various alarm was it takes a very effort the only way to make sure the work does not have to verify the operation of the programming tool or the actual I / O device that comes with the sequencer. In addition, a space is required for installing the display unit , which is a factor that hinders downsizing of the remote I / O unit.
[0005]
Incidentally, when performing an operation check of the sequence program, access to the memory of the sequencer from the sometimes programming terminal which is supplied with the sequencer want to generate a pseudo-input signal, or the real input signal hard-at input device side The ON / OFF method was used. When performing the operation check of the output device, by accessing the memory of the sequencer from the programming terminal of the sequencer, or the actual output signal at the output device side had taken a method for hard-ON / OFF.
[0006]
However, attempting to check the operation as described above, it is difficult to operation check of the output device in the stomach state are laid scene sequencer, forced ON due or jumpers a switch to an output port / It was turned off. On the other hand, when the sequence program is debugged in a state where the I / O device is not installed, it must be turned on / off by hardware at the input port similarly to the above, or performed from the programming terminal. However, in the latter case, there is a problem that the failure of the remote I / O network cannot be recognized.
[0007]
SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned conventional problem, and has a remote I / O unit for a sequencer capable of confirming an operation outside the I / O unit when the remote I / O unit is incorporated in a housing. It is intended to provide an / O unit. In addition, when the combination of the remote I / O unit and the I / O device or the combination of the remote I / O unit and the sequencer is used, the debugging efficiency is improved, and the maintainability such as the wiring check of the I / O device is improved. It is an object to provide a remote I / O unit for a sequencer.
[0008]
[Means for Solving the Problems]
The present invention has the following configuration to solve the above problems.
[0009]
According to a first aspect of the present invention, in a sequencer for controlling an I / O device via a remote I / O unit, a serial port for inputting / outputting serial data to / from the remote I / O unit is provided. Is provided with a separate external monitor device, the input / output data is time-divisionally transferred to the external monitor device via the serial port, and the input / output data is displayed on the external monitor device. Is a remote I / O unit of the sequencer.
[0010]
According to a second aspect of the present invention, in the sequencer for controlling an I / O device via a remote I / O unit, the remote I / O unit has a serial port for inputting / outputting serial data, and the remote I / O unit. A communication control unit for accessing an internal memory of the unit and extracting input / output data; an external monitor device for displaying input / output data including various alarms separately from the I / O unit; input / output data extracted by the communication control unit, so as to time-division transfer to an external monitor device via the serial port, the sequencer is characterized in that so as to display the input / output data to an external monitor device It is a remote I / O unit.
[0011]
According to a third aspect of the present invention, in a sequencer for controlling an I / O device via a remote I / O unit, a serial port for inputting / outputting serial data to / from the remote I / O unit is provided. Is provided separately with an external monitor device for displaying input / output data and setting the data in an internal memory of the I / O unit, and connecting the external monitor device and the I / O unit via the serial port . The input / output data and the set data are transferred in a time-division manner, the input / output data is displayed on an external monitor device, and the input / output data is set in the internal memory. This is a remote I / O unit of the sequencer.
[0012]
According to a fourth aspect of the present invention, in a sequencer for controlling an I / O device via a remote I / O unit, a serial port for inputting / outputting serial data to / from the remote I / O unit is provided. the separately provided and the external monitor device for setting the displayed and the data input / output data, the communication control unit and for extracting the input / output data by accessing the internal memory of the I / O unit, wherein so as to time division transferring the input / output data and the set data with an external monitoring device and the I / O unit via the serial port is set in the internal memory input / output data by the external monitor device when the communication control unit, to characterized in that so as to restrict the set of input / output data from other than the external monitor device It is a remote I / O unit of PLC.
[0013]
According to the first aspect of the present invention, the input / output data is time-divisionally transferred to an external monitor device via a serial port, and the input / output data is displayed on the external monitor device. When an external monitor device is connected to the unit and the display of the I / O unit is hidden, such as when the remote I / O unit is incorporated in the housing, without using a programming tool attached to the sequencer to check the operation , Input / output data can be displayed near the remote I / O unit. In addition, the display unit of the remote I / O unit itself can be eliminated, and the unit itself can be downsized.
[0014]
In the invention of claim 2, it extracts the input / output data by the communication control unit, the input / output data, various alarms can be displayed including Umate.
[0015]
According to the third aspect of the present invention, an external monitor for displaying input / output data and setting the input / output data is provided separately from the remote I / O unit, and an external monitor is provided via the serial port. The input / output data and the set data are time-divisionally transferred between the device and the I / O unit, and the input / output data is displayed and the input / output data is set on an external monitor device. The input / output data can be easily set in the internal memory (without using switches, jumpers, programming tools, etc.). In particular, since input / output data can be set in a state where no sequencer or I / O device is installed, debugging efficiency is improved. In addition, maintainability such as checking wiring to a remote I / O network or I / O device is also improved.
[0016]
According to the fourth aspect of the present invention, the input / output data is displayed and set separately from the remote I / O unit, and the internal memory of the remote I / O unit is accessed and input. / communication control unit and for extracting the output data provided, since the time division transferring the input / output data and the set data with an external monitoring device and the I / O unit via the serial port, optionally in the input / Output data can be set in the internal memory. Then, the time to set the input / output data on an external monitor device, the communication control unit. Thus to restrict the set of input / output data from other than the external monitor device when the data set, the sequencer It is possible to reliably prevent input / output signals from being set from an external monitor device such as a device or an I / O device. For this reason, the accuracy of debugging is improved.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0018]
FIG. 1 is an explanatory diagram of a configuration of a remote I / O unit of a sequencer according to a first embodiment of the present invention, and FIG. 2 is a functional block diagram of the remote I / O unit .
[0019]
As shown in FIG. 1, a remote I / O unit 10 according to the first embodiment includes a sequencer 14 that controls I / O devices 12 such as switches, sensors, and actuators via the unit 10 and a remote I / O network 14a. Connected to .
[0020]
As shown in FIGS. 1 and 2, the remote I / O unit 10 is provided with a serial port 16 for inputting / outputting serial data, and is provided separately from the I / O unit 10 for input / output including various alarms. An external monitor device 18 for displaying output data and a monitor communication control unit 22 for accessing an input / output data buffer (internal memory) 20 of the I / O unit 10 and extracting input / output data including various alarms are provided. The input / output data extracted by the communication control unit 22 is time-division-transferred to the external monitor device 18 via the serial port 16 (further, the serial data line 16a) by a predetermined protocol, and the input / output data is transmitted to the external monitor device 18. Is displayed .
[0021]
Note that a small computer or a personal computer having a display screen can be used as the external monitor device 18. Further, the in the remote I / O unit 10, writing to the buffer 20 of the input / output data from the sequencer 14, the remote I / O communication controller 24 that controls the out reading, the I / O device 12 and output control unit 26 for controlling the transfer of input / output data is provided.
[0022]
In the remote I / O unit 10 of the first embodiment, the input / output data is time-divisionally transferred to the external monitor device 18 via the serial port 16 (serial data line 16a), so that the external monitor device 18 Enable display of input / output data. Therefore, the monitor device 18 can be connected to the outside of the remote I / O unit 10.
[0023]
Also, the input / output data can be displayed on the external monitor device 18. In particular, when the display unit of the I / O unit is hidden, such as when the remote I / O unit is incorporated in a housing, the operation of the remote I / O unit can be checked without using a programming tool attached to the sequencer. Input / output data can be displayed near the unit. Further, the display unit of the remote I / O unit 10 itself can be eliminated, and the unit itself can be reduced in size.
[0024]
Next, a remote I / O unit according to a second embodiment will be described. FIG. 3 is a configuration explanatory diagram of a second embodiment of the remote I / O unit, and FIG. 4 is a functional block diagram of the remote I / O unit . 1 and 2 are denoted by the same reference numerals.
[0025]
As shown in FIG. 3, the remote I / O unit 30 is connected via a remote I / O network 14a to a sequencer 14 that controls I / O devices 12 such as switches, sensors, and actuators via the unit 30. Things. The programming terminal 14b is connected to the sequencer 14.
[0026]
The remote I / O unit 30, as shown in FIG. 4, the serial port 32 for inputting / outputting the serial data (serial data line 32a) is provided, wherein the remote I / O unit 30 inputs / outputs separately an external monitor device 34 to set the display vital input / output data of data, the I / input / output data O unit 30 buffers the communication control unit 38 for extracting the (internal memory) 36 access to the input / output data the provided so that time division transferring the input / output data and the set data with an external monitor device 34 and the I / O unit 30 via the serial port 32 and. At the same time, when the I / O unit 30 sets input / output data in the data buffer 36 by the external monitor device 34, the communication control unit 38 controls the input / output from other than the external monitor device 34. Data sets are prohibited (an example of regulation).
[0027]
Note that a small computer or a personal computer having a display screen can be used as the external monitor device 34. Further, the in the remote I / O unit 30, writing to the buffer 36 of the input / output data from the sequencer 14, the remote I / O communication controller 24 that controls the out reading, the I / O device 12 and output control unit 26 for controlling the transfer of input / output data is provided. In the remote I / O unit 30, an external monitor device 34 for displaying input / output data and setting input / output data is provided separately from the unit 30, and the serial port 32 (serial data line 32a) is provided. the so as to time division transferring the input / output data and the set data with an external monitor device 34 and the I / O unit 30 via, displays input / output data on an external monitor device 34 and the buffer 36 Is refreshed and the data is set in the data buffer 36, so that input / output data can be set in the buffer 36 arbitrarily and easily (without using switches, jumpers, programming tools, etc.).
[0028]
In particular, since input / output data can be set in a state where no sequencer or I / O device is installed, debugging efficiency is improved. In addition, maintainability such as checking wiring to a remote I / O network or I / O device is also improved.
[0029]
When the external monitor device 34 sets and rewrites input / output data, the communication control unit 38 writes the input data from the input / output control unit 26 to the buffer 36 (input) when setting the data. (When data is set) and writing of output data from the remote I / O communication control unit 24 to the buffer 36 (when output data is set) is prohibited.
[0030]
Accordingly, the external monitor set of input / output data from the other device 34 can be prohibited, that the input / output data is set from the external monitor device 34 of the 12 side such sequencer 14 side or the I / O device Can be reliably prevented. For this reason, the accuracy of debugging is improved.
[0031]
【The invention's effect】
As described above, according to the first aspect of the invention, the external monitor is connected to the remote I / O unit, and the display unit of the I / O unit is hidden when the remote I / O unit is incorporated in the housing. In this case, input / output data can be displayed near the remote I / O unit without using a programming tool or the like attached to the sequencer. In addition, the display unit of the remote I / O unit itself can be eliminated, and the unit itself can be downsized.
[0032]
In the invention of claim 2, in addition to the effects of claim 1, it extracts the input / output data by the communication control unit, an input / output data, various alarms can be displayed including Umate.
[0033]
According to the third aspect of the present invention, input / output data can be set in the internal memory arbitrarily and easily (without using switches, jumpers, programming tools, etc.). In particular, since input / output data can be set in a state where no sequencer or I / O device is installed, debugging efficiency is improved. In addition, maintainability such as checking wiring to a remote I / O network or I / O device is also improved.
[0034]
In the invention of claim 4, in addition to the effects of the invention of claim 3, when setting the input / output data on an external monitor device, the communication control unit, the when loading the Input / Output Data Since the setting of input / output data from devices other than the external monitor device is regulated, it is possible to reliably prevent input / output data from being set from an external monitor device such as the sequencer side or the I / O device side. For this reason, the accuracy of debugging is improved.
[Brief description of the drawings]
FIG. 1 is a configuration explanatory diagram of a first embodiment of a remote I / O unit of a sequencer according to the present invention.
FIG. 2 is a functional block diagram of a remote I / O unit according to the first embodiment.
FIG. 3 is an explanatory diagram of a configuration of a second embodiment of the remote I / O unit.
FIG. 4 is a functional block diagram of a remote I / O unit according to a second embodiment.
[Explanation of symbols]
10 Remote I / O unit,
12 ... I / O equipment,
14 ... sequencer,
16. Serial port,
18 external monitor device,
20 ... input / output data buffer,
22 monitor communication control unit
30 Remote I / O unit
32… Serial port,
34 external monitor device,
36 ... input / output data buffer,
38 monitor communication control unit

Claims (4)

In a sequencer that controls an I / O device via a remote I / O unit,
A serial port for inputting / outputting serial data is provided to the remote I / O unit,
An external monitor device is provided separately from the remote I / O unit,
The input / output data is time-divisionally transferred to an external monitor via the serial port,
A remote I / O unit for a sequencer, wherein input / output data is displayed on an external monitor device. In a sequencer that controls an I / O device via a remote I / O unit,
The remote I / O unit includes a serial port for inputting / outputting serial data, and a communication control unit for accessing an internal memory of the remote I / O unit and extracting input / output data ,
An external monitor device for displaying input / output data including various alarms is provided separately from the I / O unit,
Input / output data extracted by said communication control unit, so as to time-division transfer to an external monitor device via the serial port,
A remote I / O unit for a sequencer, wherein input / output data is displayed on an external monitor device. In a sequencer that controls an I / O device via a remote I / O unit,
A serial port for inputting / outputting serial data is provided to the remote I / O unit,
An external monitor for displaying input / output data and setting the data in an internal memory of the I / O unit, separately from the remote I / O unit;
The so as to time division transferring the input / output data and the set data with an external monitoring device and the I / O unit via the serial port,
A remote I / O unit for a sequencer, wherein input / output data is displayed on an external monitor device and the input / output data is set in the internal memory. In a sequencer that controls an I / O device via a remote I / O unit,
A serial port for inputting / outputting serial data is provided to the remote I / O unit,
An external monitor for displaying input / output data and setting the data separately from the remote I / O unit, and a communication for accessing the internal memory of the I / O unit and extracting the input / output data And a control unit.
The so as to time division transferring the input / output data and the set data with an external monitoring device and the I / O unit via the serial port,
When loading the input / output data in the internal memory by the external monitor device, the communication control unit, a sequencer, characterized in that so as to restrict the set of input / output data from other than the external monitor device Remote I / O unit.

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