JP3332669B2 - Programmable controller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply device for a programmable controller (hereinafter, referred to as a PC) and a mounting base thereof, and more particularly to a power supply device for a PC suitable for saving power by utilizing a function unique to the PC. Related to power saving devices and mounting bases.

[0002]

2. Description of the Related Art The recent demand for power saving of electronic devices has been extended to quite detailed parts. For example, a microcomputer described in Japanese Utility Model Laid-Open No. 2-18132
In other systems, a system composed of a CPU unit and various interface units, all units in not supply power uniformly, power to the unit substrate when the emitted predetermined control signal for each unit substrate Is supplied, and the power supply to other unit substrates is cut off to save power. Although not in terms of power saving, the information processing apparatus described in Japanese Patent Application Laid-Open No. 4-333118 has a terminal for supplying power to each slot for mounting various packages constituting the information processing apparatus, and switches each terminal with a switch. Opening / closing is controlled by group.

[0003]

As described above, in recent electronic devices, the availability of power supply is controlled for each unit constituting the system. However, these prior arts are all directed to information processing apparatuses such as computers, and are not directed to PCs. PC
Although it is a kind of computer in a broad sense, it is a computer specialized in control, and its power supply part is different from a normal computer.

A PC is often installed on a production line in a factory, and its power switch is not provided on the PC itself, but is incorporated in a control panel of a factory provided separately from the PC. Therefore, even if the PC is not used, the power is often supplied to the PC if the power of the factory is turned on. This power is P
The power supply module C converts the DC voltage into a predetermined DC voltage, and this DC voltage is always supplied to the CPU module and each I / O module. In a normal computer, the CPU operates when power is supplied. However, the PC may not use the PC even if the power of the factory is turned on. A CPU switch for controlling the stop is provided.

In the case of a normal computer, it is rare that other units are simultaneously driven when the CPU is operating among the constituent units. For example, the printer is rarely driven during the execution of the arithmetic processing of the CPU,
For this reason, it is a conventional technique to shut off the power supply to the printer driving unit when the printer is not driven. On the other hand, in the PC, when the CPU performs the arithmetic operation, the input information from each input device is taken in, and the control signal is output to each output device. Therefore, it can be said that all the I / O modules are in operation. For this reason, it is not possible to achieve the power saving by directly applying the above-described conventional technology to the PC, and it is necessary to take measures based on the function unique to the PC.

SUMMARY OF THE INVENTION An object of the present invention is to provide a power saving device and a PC mounting base capable of eliminating wasteful consumption of power in a PC.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to provide an I / O module, a power supply section for converting external power supplied through a power switch to a predetermined DC voltage, and supplying the predetermined voltage to each I / O module. a power supply module having a supply control unit, first to control the run or stop of the CPU
And a CPU module having a switch of
A second switch corresponding to each I / O module for setting whether or not the predetermined voltage can be supplied to each I / O module when the PU is stopped , and a sequence executed by a CPU run
Power to each I / O module by the instruction of the
This is achieved by providing a means for supplying or shutting off the source .

[0008]

[0009]

The I / O module of the PC is mounted on the mounting base for each module, and power is supplied to the I / O module from the power supply module via a joint (connector) between the mounting base and the I / O module. Power is supplied to each I / O module independently, and power supply to one I / O module is not related to the mounting state of another I / O module. Also, when the operation of the PC CPU is stopped, the CPU
Since there is no need to exchange input / output signals between the I / O module and the I / O module, there is no need to supply power to the I / O module. Further, even when the CPU is performing a calculation, there is no need to exchange input / output signals with an I / O module not related to the calculation, and it is not necessary to supply power to the I / O module not related to the calculation. Taking advantage of such PC features,
A switch corresponding to each I / O module is provided for setting a supply control condition (supply / non-supply) of a supply control unit for controlling the supply of power to each I / O module. The supply of power to the I / O module is controlled for each I / O module under various conditions by the detection signal.

[0010]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 5 is an overall configuration diagram of a PC according to an embodiment of the present invention. This PC is configured by connecting two extension bases (unit numbers “1” and “2”) to one basic base (unit number “0”). A power supply module is provided for each of the basic base and the extension base,
A CPU is mounted on the basic base, and an I / O
An O controller (IOC) is implemented. Basic base,
Slots with slot numbers '0' to '8' are prepared in the extension bases, respectively, and I / O modules are mounted here.

FIG. 1 is a configuration diagram of a basic base (base on which a CPU is mounted) 15. The power supply module mounting section includes a power supply section 12 for converting external power supplied through a power switch (not shown) installed in a remote place to DC 5 V, and a supply control for controlling supply of DC 5 V to each I / O module. A unit 10 and a dip switch 11 for setting power supply conditions are provided. The CPU module is provided with a CPU switch (not shown) for setting run / stop of the CPU.

The supply control unit 10 includes a dip switch 11
And power supply to each I / O module is controlled by the control signal from the CPU 13 mounted on the CPU mounting unit. Power is supplied from the supply control unit 10 to each I / O module via a connector 14 provided on the basic base 15 for the I / O module.

FIG. 2 is a configuration diagram of an extension base (base connected to a CPU, a communication cable, and an I / O control module (IOC)) 17. IOC17
Is different from the basic base (FIG. 1) only in that an IOC 16 is mounted instead of the CPU 13 shown in FIG.
The input of a control signal from the PU 13 is performed via the IOC 16 to the supply control unit 10 in FIG.

FIG. 3 is an explanatory diagram of the DIP switches 11 provided on each of the basic base and the extension base. The dip switch includes switches '0' to '8' corresponding to each I / O slot number and a switch '9'. A case where the power supply to the I / O module is stopped when the RUN of the CPU is stopped using the DIP switch of FIG. 3 will be described. The switch '9' of the dip switch is used for operation designation. As the mode for specifying the operation, the stop mode: the switch '9' is set to ON. The mode in which the power supply to the I / O module is stopped when the CPU RUN is in the stop state. The power supply mode: The switch '9' is set to OFF. Two modes, a mode in which power is always supplied to the I / O module , are prepared. Note that the switch '9' for designating the operation is valid only for the dip switch of the basic base on which the CPU is mounted, and this switch '9' is invalid for the dip switch of the extension base. The power supply mode is the same as the conventional one, and is a mode in which power is always supplied to all I / O modules irrespective of CPU run / stop. The stop mode is a mode introduced in this embodiment. When the CPU is in the run state, power is supplied to all I / O modules, and when the CPU is in the stop state, only the I / O modules selected and designated are stopped. In this mode, power is supplied, and power supply to other I / O modules is cut off to save power.

For example, LA and another PC or computer
In the case where a communication module connected via a communication line such as N exists in its own PC, it is determined that power supply to the communication module is interrupted even when its own CPU is stopped. , Communication becomes impossible,
Power supply to this communication module needs to be secured. Therefore, even when the switch '9' of the DIP switch 11 is set to ON and the stop mode is selected,
The switch of the slot number in which the communication module is mounted is turned on. For example, when a communication module is mounted on the slot number “4”, the switch “4” in FIG. 3 is turned on. With this, the CPU of the PC
Is stopped, slot numbers '0' to '3', '5'
The power supply to the I / O modules attached to .about.'8 'is cut off, but the power supply is secured to the communication module attached to slot number' 4 '.

In the above-described embodiment, when the CPU is in the run state, power is supplied to all the I / O modules.
It is preferable to control whether power can be supplied to the I / O module as needed even in the PU run state. This control is called CP
An embodiment executed by U will be described with reference to FIG. FIG.
Shows an example in which power supply to the I / O module is stopped by a command of a sequence program (user program). For example, an eleventh switch may be provided as a dip switch, and this switch may be used to selectively specify whether or not to supply power by a command from the CPU. This is to prevent an erroneous power supply stop due to a program error.

In FIG. 4, when there is a description "POW ON (ab)" in the sequence program,
The CPU supplies power to the I / O module attached to the slot number b of the base of the unit number a,
When there is a description “POW OFF (ab)”, the CPU cuts off the power supply to the I / O module mounted on the slot number b of the base of the unit number a. By creating and executing a sequence program in which such instructions are set in various places, fine power saving can be achieved. Note that the eleventh switch is an OF switch.
In the case of F, the instruction of FIG. 4 described in the sequence program is ignored.

FIG. 6 is an example of a sequence program showing a specific example of this instruction. CPU is “POW OFF”
When the (01) "command is executed, the CPU 13 sends the I to the supply control unit 10 in the slot number 1 of the basic base (unit number '0': see FIG. 5) designated by the command.
When a control signal for stopping the power supply to the / O module is issued and the CPU executes the "POW ON (01)" instruction, a control signal for restarting the power supply to the I / O module is issued.

FIG. 7 illustrates an example in which power supply to an unnecessary I / O module is fixedly stopped by setting a dip switch. Although the configuration of the PC is the same as that of FIG. 5, in the present embodiment, power is saved without using a control signal from the CPU 13. That is, the power supply control by the dip switch is enabled (ON) by the switch '9'.
If the switch '9' is ON and the switches '0' to '8' are ON, power is supplied to the slot corresponding to this switch number. If the setting is OFF, the supply of power to the slot corresponding to the switch number is stopped. When the switch '9' is OFF, power is always supplied to all slots regardless of the setting of the dip switch.

The supply control is performed by the supply control unit 10 by setting the dip switch 11. Also,
By devising a setting method of the DIP switch 11 and giving the supply control unit 10 various functions, various controls can be performed.

In the embodiment described above, the switch corresponding to each I / O module is realized by a dip switch that is integrated. However, instead of such a dip switch, as shown in FIG. , I / O
A switch 60 corresponding to the module is provided.
0 may control the supply of power to the I / O module. A power supply module similar to the conventional one is used.

According to the above-described embodiment, the supply of power to the I / O module can be controlled for each I / O module under various conditions, and the power saving of the system according to the system configuration and operation status of the PC can be achieved. Will be able to do it. For example, considering a PC system composed of two extension units in which five I / O modules are mounted on one CPU and seven I / O modules are mounted, all I / O modules are considered.
In a state where power is supplied to the O module and in a state where power is not supplied to all the I / O modules, power consumption when power is not supplied consumes about 80% less power than when power is supplied. Therefore, when the CPU operation is stopped, the I / O
By stopping unnecessary power supply to the module, the power consumption at that time can be reduced to about 20% of the normal time.

According to the embodiment, I can be arbitrarily set by setting.
Since the supply of power to the / O module can be stopped, the I / O module can be removed and attached without powering down the system, which is effective for system maintenance. Further, by eliminating unnecessary power supply, the time for energizing the I / O module is shortened, the life of components and the entire product is extended, and the reliability of the PC system is improved.

[0024]

According to the present invention, there is an effect that the power saving of the PC can be performed finely.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a basic mounting base of a PC according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of an additional mounting base of a PC according to an embodiment of the present invention.

FIG. 3 is an explanatory diagram of a dip switch provided on each mounting base of FIGS. 1 and 2;

FIG. 4 is an explanatory diagram of a power supply instruction specification.

FIG. 5 is an overall configuration diagram of a PC configured by connecting a basic unit and two additional units.

FIG. 6 is a diagram showing an example of a sequence program using a power supply instruction.

FIG. 7 is a diagram illustrating another configuration example of the DIP switch.

FIG. 8 is a configuration diagram of a PC when a switch is provided on a mounting base.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Supply control part, 11 ... Dip switch, 12 ... Power supply part, 13 ... CPU, 14 ... Connector, 15 ... Basic mounting base, 16 ... IOC, 17 ... Extension mounting base, 60 ...
switch.

Continued on the front page (72) Inventor Masato Takase 7-1-1-1 Higashi Narashino, Narashino-shi, Chiba Industrial Machinery Division, Hitachi, Ltd. Yoshie Sasaki, Inspector, Industrial Equipment Division, Hitachi, Ltd. (56) References JP-A-4-333118 (JP, A) JP-A-52-52525 (JP, A) Kaihei 2-18132 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) G05B 19/04-19/05

Claims (1)

(57) [Claims] An external power supply supplied through an I / O module and a power switch is supplied with a predetermined DC voltage.
A power supply unit for converting the voltage into a voltage and the I / O module
Power supply module having a supply control unit for supplying power to the module
And the CPUofrunOrControl the stopFirstSwitch
CPU with CPU module
In the controller, the CPU of the CPU moduleofEach I / O module at stop
The specified voltage can be supplied to the moduleOrSet each impossibility
I / O module compatibleSecondSwitch and, Sequence program instructions executed by CPU run
To supply or cut off power to each I / O module
Means Characterized by the provision ofProgrammable controller
roller.