JPH0697411B2 - Analog I/O Unit - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a programmable controller of a building block type, which is a single block of the programmable controller, and is a controller for connecting an external device which inputs and outputs analog signals to and from the programmable controller.
This relates to an analog I/O unit that is attached to a programmable controller to ensure signal matching between the CPU unit and the analog I/O unit.

FIG. 2 is a diagram showing a typical analog I/O unit of a building block type sequencer.
(5) is the external connection terminal, and (6) is the LED display.

Conventional analog I/O units are configured as above.
Functions such as input/output capabilities, input/output rated voltage (AC or DC), and number of input/output points are all fixed, so the user is free to select and use each function.

There are also analog I/O units that are configured to process multiple input signals in one unit, but in order to ensure versatility, such analog I/O units are usually manufactured with the same input signal ratings for all input signals.

[Problem that the invention aims to solve]

In the conventional analog I/O units described above, for example, when the number of inputs is small and the input ratings are different,
It is necessary to use several different I/O units.
In that case, many of the input terminals are left unused, resulting in a problem of waste.

This invention was made to solve the above problems, and is an analog converter that allows users to meet their requirements with as few units as possible when the number of input/output points is small (4CH or less) and the input/output ratings are different.
The purpose is to obtain an I/O unit.

[Means for solving the problem]

The analog I/O unit of the present invention is an analog I/O unit that is mounted as one block in a building block type programmable controller having a CPU unit and that matches signals between the CPU unit and external devices that input and output analog signals, and is equipped with analog input/output module insertion sections that have a plurality of analog signal channels and are provided corresponding to each of the plurality of analog signal channels, offset adjustment switches that perform offset adjustment, gain adjustment switches that perform gain adjustment, and a change-over switch that switches the analog signal channel that is adjusted by the offset adjustment switch and gain adjustment switch to one of the plurality of analog signal channels, and an analog input/output module corresponding to the rating of the input/output signal of the channel is mounted in the analog input/output module insertion section of the channel to perform analog input/output processing.

[Function] The analog I/O unit of the present invention has a plurality of analog signal channels and comprises analog input/output module insertion sections provided corresponding to each of the plurality of analog signal channels, an offset adjustment switch for performing offset adjustment, a gain adjustment switch for performing gain adjustment, and a changeover switch for switching the analog signal channel to be adjusted by the offset adjustment switch and the gain adjustment switch to one of the plurality of analog signal channels, and an analog input/output module corresponding to the input/output signal rating of the channel is attached to the analog input/output module insertion section of the channel, and analog input/output processing is performed.

[Embodiment of the invention] Hereinafter, one embodiment of the present invention will be described with reference to the drawings.
In the diagram, (4) is the insertion point for the analog input/output module. By inserting various cassette tape-sized analog input/output modules into these four spaces, the user can change each channel to the specifications he or she desires. (1) is also the analog I/O
An LED lights up when the unit is running. (2) is a switch, such as a channel select switch, for selecting the channel for offset adjustment and gain adjustment.
(3a) is an offset adjustment switch, and (3b) is a gain adjustment switch. These offset adjustment switch (3a), gain adjustment switch (3b), and changeover switch (2) are used to adjust each analog input/output module. That is, after switching to the channel to be adjusted with the channel select switch (2), the offset adjustment switch (3a) is used to adjust the offset, and the gain adjustment switch (3b) is used to adjust the gain. The adjustment results are stored in memory (not shown), so the offset adjustment switch (3a) and gain adjustment switch (3b) can be shared by each channel. (5) is a mounting terminal block for external wiring, and has the same configuration as a conventional analog I/O unit.

The analog I/O unit of this invention is different from the conventional analog I/O unit in that the user can freely change the function and rating of each channel by selecting an input/output module. Also, as is clear from Fig. 1, the input/output modules are configured to be replaceable from the front of the analog I/O unit.

[Effects of the Invention]

As described above, the analog I/O unit of the present invention has a plurality of analog signal channels and comprises analog input/output module insertion sections provided corresponding to each of the plurality of analog signal channels, an offset adjustment switch for performing offset adjustment, a gain adjustment switch for performing gain adjustment, and a changeover switch for switching the analog signal channel to be adjusted by the offset adjustment switch and the gain adjustment switch to any one of the plurality of analog signal channels, and an analog input/output module corresponding to the rating of the input/output signal of the channel is mounted in the analog input/output module insertion section of the channel and analog input/output processing is performed. Therefore, when there are few input/output points and the input/output ratings are different, a small number of analog I/O units can be used, saving space in the mounting section and reducing the number of free input/output points, thereby saving memory, connector bins, etc. allocated to these free input/output points. Furthermore, the offset adjustment switch and the gain adjustment switch can be shared by a plurality of channels, resulting in the effect of making the device smaller in size and lowering the cost.

[Brief description of the drawings]

Fig. 1 is an external view showing an analog I/O unit according to one embodiment of the present invention, and Fig. 2 is an external view of a typical analog I/O unit of a conventional building block type sequencer. In the figure, (1) is a RUN LED, (2) is a channel select switch, (3a) is an offset adjustment switch,
(3b) is the gain adjustment switch, (4) is the input/output analog module insertion point, (5) is the external mounting terminal block,
(6) indicates the LED display unit. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] [Claim 1] An analog I/O unit which is mounted as one block in a building block type programmable controller having a CPU unit and which matches signals between the CPU unit and external devices which input and output analog signals, said analog I/O unit comprising: an analog input/output module insertion section having a plurality of analog signal channels and corresponding to each of said plurality of analog signal channels; an offset adjustment switch for performing offset adjustment; a gain adjustment switch for performing gain adjustment; and a changeover switch for switching the analog signal channel to be adjusted by the offset adjustment switch and gain adjustment switch to one of said plurality of analog signal channels, and which performs analog input/output processing by mounting an analog input/output module corresponding to the rated input/output signal of said channel in said analog input/output module insertion section of said channel.