JP2003233445A - Decision method for module id and module-mounted equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a decision method for module ID and module-mounted equipment that can decide the ID of each module having a withstand high voltage insulation circuit same as conventional one without using an added high withstand voltage insulation circuit for deciding the ID. <P>SOLUTION: The module-mounted equipment is constituted such that it can connect, by a piling up method, more than one module having a power source bus and a communication bus, and a high withstand voltage insulation circuit for power source and a high withstand voltage insulation circuit for communication for insulating the buses, respectively, to high withstand voltages and the ID of each module can be decided automatically. Each of the modules is constituted such that it has a low withstand voltage insulation circuit that turns the communication bus ON/OFF on the output end side, and a control circuit that controls in turning the low withstand voltage insulation circuit ON/OFF in response to a signal from the communication bus on the input side, respectively, on a common electric potential side. For deciding the ID, the low voltage insulation circuit of a module connected to a previous stage is turned on, so that an objective module is permitted to carry out communications to decide the ID. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device in which a plurality of modules can be mounted, and more particularly to improvement of a method for determining mounting position information (hereinafter referred to as ID) of each module.

[0002]

2. Description of the Related Art Conventionally, there is a device in which a plurality of modules are connected by a stacking method. For example, there is a measuring instrument such as a recorder that is equipped with a plurality of measuring modules and is configured to measure the physical quantity of a measurement target via each measuring module. In the following, such a measuring instrument will be described as an example.

FIG. 7 is a schematic view of the essential parts of a measuring instrument of this type. A plurality of measurement modules 1 (the same reference numerals are attached for convenience) are detachably attached to slots (not shown) of the module mounting base 2 provided on the measuring instrument body side.

The module mounting base 2 has an ID for determining position information when the measurement module 1 is mounted.
Decision circuit 23 (for convenience sake, the same reference numeral is given to a plurality of them)
Is provided. Each ID determination circuit 23 has a unique value depending on its position. The measurement module 1 mounted on the module mounting base 2 needs to know at which position it is mounted, and knows it from this unique value. The module mounting base 2 also has a power supply 21 and a CPU.
22 is also provided.

In a recorder or the like, the module mounting base 2 side and the measurement module 1 side are normally insulated DC / DC.
It is electrically insulated from the converter (not shown) via a communication pulse transformer (not shown). In the figure, two types of lines, that is, a communication line connecting the CPU 22 and the measurement module 1 and a power supply line connecting the power supply 21 and the measurement module 1 are not shown, but each line inside the measurement module 1 is electrically connected. Electrically isolated.

In such a configuration, the measurement module 1 side has its own ID by the ID determination circuit 23 (the same number is attached to the plurality for the sake of convenience) existing on the base 2 side.
To confirm. When the power is turned on or when the system configuration is changed, a unique ID is acquired from the ID determination circuit 23.

FIG. 8 shows another conventional example. The CPU of the control unit 30 provided on the side of the measuring instrument and the measuring module 10 are usually insulated DC / DC for power supply.
Insulated by converter and pulse transformer for communication. The insulated DC / DC converter and the pulse transformer for communication are both high-voltage insulating components, and the symbol of the transformer is shown in FIG. 8 instead.
Further, two photo couplers are provided as insulating parts for determining the ID.

The operation for determining the ID in such a configuration is as follows. (B) Step 1 An ID determination permission signal is sent from the control unit 30 through the ID determination auxiliary line. At this time, the ID determination auxiliary signal on the rear side of the module position 0 is OFF. (B) Step 2 The control unit 30 transmits an ID value 0 (hereinafter referred to as ID0) through the communication line.

(C) Step 3 When ID0 is written in the module 10 in the module position 0, the fact that the module 10 in the module position 0 has processed is reported to the control unit 30. (D) Step 4 The control unit 30 instructs the module at module position 0 to transmit the ID determination permission signal to the next module via the auxiliary line for ID determination on the rear side of the module.

(E) Step 5 The control unit 30 is notified that the module at module position 0 has transmitted the ID determination permission signal. (F) Step 6 The control unit 30 transmits ID1 through the communication line. At this time, since the writing of the unit of ID0 has already been completed, the writing communication of ID1 is ignored at the judgment of the module itself. (G) Step 7 By repeating steps 1 to 6 described above, the module I
Write D and go.

[0011]

However, such a conventional measuring instrument has the following problems. (A) In the case of the measuring instrument shown in FIG. 7, since the module mounting base 2 is used, the lateral width of the module 1 is limited and fixed. When designing modules of different sizes, the choice is limited to an integer multiple of the reference width.

For example, if the slot width is 5 cm, then 5c
m, 10 cm, 15 cm ,. ． ． Only a module with a width of 10 cm can be applied.
Will occupy a minute space. Modules with odd widths cannot be manufactured as a practical problem.

The module mounting base is fixed to a width of, for example, 6 slots, but one module (for example, a measurement unit for 10 channels is built in).
A horizontally long module mounting base with extra slots is a hindrance for users only to use. Manufacturing a module mounting base with a short width increases the development cost due to mold cost and testing.

(B) In the case of the measuring instrument shown in FIG. 8, an extra component mounting space is required because a high breakdown voltage photocoupler is used. In addition, it is necessary to consider the creepage distance for insulation, which requires a larger space. Typically,
High-voltage insulating parts require a larger space than low-voltage insulating parts.

In addition to the configurations shown in FIGS. 7 and 8, a configuration in which an address switch is provided for each module is also conceivable, but in the worst case at the time of reconfiguring the modules, it is necessary to manually change the switches of all the modules. There is a problem of poor sex.

Note that such a problem is not limited to the measurement module and the measurement module-mounted type measuring instrument as an example, but a control output module, a digital I / O module,
This is also a problem that applies to various modules such as communication modules and devices equipped with these modules.

An object of the present invention is to solve the above-mentioned problems. Each module has a high withstand voltage insulation circuit similar to the conventional one, but each module has a high withstand voltage insulation circuit without additional use. It is an object to provide a module ID determination method capable of determining a module ID and a module-mounted device using the method.

[0018]

In order to achieve such an object, the invention of claim 1 provides a power supply high withstand voltage insulation circuit and a communication high withstand voltage insulation circuit for high withstand voltage insulation from a power supply bus and a communication bus, respectively. And a means for turning on / off the power supply bus or the communication bus on the common potential side,
A method for determining an ID of a plurality of modules that are connected in a stacking manner. When determining an ID, the power supply bus of each module connected to the preceding stage is turned on and the power supply bus of the module connected to the latter stage of the target module is turned on. After turning off the power to enable power supply to the target module, or turning on the communication bus of each module connected to the preceding stage and turning off the communication bus of the module connected to the latter stage of the target module. After the communication to the module is enabled, the ID of the target module is determined.

According to such a method, although the modules have the same high withstand voltage insulation circuit for communication and power supply as in the conventional case, the high voltage withstand circuit is not used for ID determination, and the power bus or communication of the module is not used. The ID can be determined by selecting the target module simply by turning the bus ON / OFF.

According to a second aspect of the present invention, a plurality of modules each having a power supply bus and a communication bus and a power supply high-voltage insulation circuit and a communication high-voltage insulation circuit that perform high-voltage insulation can be connected in a stacking manner. A module mounting type device configured to automatically determine the ID of each module, wherein each module includes a low breakdown voltage insulation circuit for turning on / off the communication bus on the output end side, and communication on the input end side. ON of the low voltage insulation circuit according to the signal from the bus
When a control circuit for controlling ON / OFF is provided on the common potential side and the ID is determined, the target module can be communicated and the ID can be determined by turning on the low withstand voltage insulation circuit of the module connected in the preceding stage. It is characterized by being configured as follows. With such a configuration, the ID of the measurement module can be determined without additionally using a high breakdown voltage insulation mechanism.

According to the third aspect of the present invention, a plurality of modules each including a power supply bus and a communication bus and a high-voltage insulation circuit for power supply and a high-voltage insulation circuit for communication that perform high-voltage insulation can be connected in a stacking manner. A module mounting type device configured to automatically determine the ID of each module, wherein each module controls a relay circuit that turns communication ON / OFF individually and ON / OFF of this relay circuit. It is characterized in that the control circuit is provided, and when the ID is determined, communication is enabled by the operation of the relay circuit, and the ID is determined.

According to this structure, even if the number of measurement modules is increased, the number of low withstand voltage insulation circuits passing through the communication bus as in the invention of claim 2 is not increased, so that the module mounting type having high reliability in ID determination. The device can be easily realized.

In this case, the control circuit is provided with a shift register using a flip-flop, and the ON / OFF of the relay circuit can be controlled by an output signal from the shift register. And the shift registers of each measurement module are connected in series.

According to a fifth aspect of the present invention, the shift register of the control circuit is formed by connecting two or three stages of flip-flops in series. In the case of a shift register with two stages of flip-flops, I
There is an advantage that D can be determined. When the number of flip-flops is three, the reliability is improved as compared with the case of two stages.

Further, as in claim 6, the control circuit can be configured so as to operate only when the ID is determined, and the power consumption can be easily reduced by such a configuration. In this case, it is desirable that the relay of the relay circuit is a normally closed type relay.

According to the eighth aspect of the present invention, a plurality of modules including a power supply bus and a communication bus, and a power supply high-voltage insulation circuit and a communication high-voltage insulation circuit that perform high-voltage insulation, respectively, can be connected in a stacking manner. Along with the module mounting type device configured to automatically determine the ID of each module, when determining the module ID,
The power supply bus of each module is individually controlled to supply or stop the power supply.

Even if the power supply buses are individually controlled in this way,
Since the number of low-voltage insulation circuits is not increased, it is possible to easily realize a highly reliable measuring module-mounted type measuring instrument capable of determining an ID.

[0028]

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in detail below with reference to the drawings. In addition, here, a measurement module mounting type measuring instrument in which the measurement module is mounted will be described as an example. FIG. 1 is a block diagram showing an embodiment of a measuring module mounting type measuring instrument according to the present invention. The measuring instrument of the present invention is a measuring instrument that measures by mounting a plurality of measuring modules, and these measuring modules can be connected in a stacking manner, and a high withstand voltage can be achieved without using a conventional module mounting base. It has an insulating function and is configured to be able to automatically determine the ID of each measurement module.

In FIG. 1, reference numeral 100 is an insulating measuring module, and 300 is a control unit including a CPU and a power supply. The measurement module 100 includes a high voltage insulation circuit 110 for power supply, a high voltage insulation circuit 120 for communication, a control circuit 130, and a low voltage insulation circuit 140.

The high-voltage insulation function is left to the original insulation parts. For example, the high-voltage insulation circuit 110 for power supply is an insulation type DC / DC converter, and the high-voltage insulation circuit 120 for communication.
Is a pulse transformer or the like. The same applies to the other measurement modules 100.

The control circuit 130 and the low breakdown voltage insulation circuit 140 are placed on the common potential side. The control circuit 130 generates a signal for controlling the low breakdown voltage insulation circuit 140 based on an instruction from the control unit 300. The low breakdown voltage insulation circuit 140 is the control circuit 13
It connects and disconnects (ON / OFF) the communication line according to a signal from 0, and for example, a mechanical relay for small signals is used.

The main power supply line 301 from the power supply of the control unit 300 is connected to the high voltage insulation circuit 110 of each measurement module 100. Control unit 3
A communication / control line (also referred to as a communication bus) 302 connected to the CPU of 00 is connected to the high breakdown voltage insulation circuit 120, the control circuit 130, and the low breakdown voltage insulation circuit 140 of the first-stage measurement module 100.

The communication / control line 302 passing through the low breakdown voltage insulation circuit 140 is connected to the high breakdown voltage insulation circuit 120, the control circuit 130, and the low breakdown voltage insulation circuit 140 of the measurement module 100 in the next stage. Hereinafter, the measurement module in the subsequent stage is connected in the same connection relationship.

The operation of such a configuration will be described below. In this embodiment, the communication bus 302 is turned on / off at the exit of each measurement module (this method is referred to as a bus ON / OFF type here). The communication of the measurement module of the preceding stage mounted closer to the CPU side than the target measurement module is always ON.

When setting the ID of the No. 1 measurement module, the low withstand voltage insulation circuit 140 is turned off, and the ID is set so that no signal is transmitted to the communication buses of the measurement modules of No. 2 and thereafter. Next, when performing the process of writing the ID to the No. 2 measuring module, the low withstand voltage insulating circuit 140 of the No. 1 measuring module is turned on and the ID of the No. 2 measuring module is set.

At this time, the ID of the No. 1 measurement module is already written, and in this case, the No. 2 write signal flowing through the communication bus is ignored. The IDs are set for the measurement modules of No. 3 and later in the same manner as described above, and thus the IDs are sequentially set for all the measurement modules.

FIG. 2 shows another embodiment of the present invention (individual communication ON.
FIG. 4 is a main part configuration diagram showing a / OFF type). In the figure, high-voltage insulating components are indicated by a transformer symbol. For example, a pulse transformer is used for communication and an insulating DC / DC converter is used for power supply.

The communication bus 402 output from the control unit 400 is directly connected to all measurement modules without being turned on / off. Relay circuits RL1 (RL2, RL3) are inserted in the communication lines branching from the communication bus 402 to the insulating parts of the respective measurement modules. Each relay circuit is ON / OFF controlled by the control circuit 130a in the measurement module. In addition,
It is possible to always send a signal to the communication bus 402.

In the embodiment of FIG. 1, as the number of measurement modules connected increases, the low breakdown voltage insulation circuit 14 is proportionally increased.
The number of 0s also increases. In the embodiment of FIG. 2, since the possibility of occurrence of contact failure due to the increase in the low breakdown voltage insulation circuit is reduced, the reliability can be expected to be improved. By the way, R in Figure 2
L1, RL2 and RL3 are low breakdown voltage insulation circuits. Also,
Although it depends on the usage, the communication of other than the target measurement module can be turned off, so that the protocol for ID determination can be simplified.

Details of the control circuit 130a are shown in FIG. A shift register using D flip-flops No1a and No1b is used as the control circuit 130a. Each D
The clock (CLK) from the control unit 400 is input to the clock terminal of the flip-flop, and the reset signal (RES) from the control unit 400 is input to the reset terminal.

SI from the control unit 400 is connected to the data input terminal (D terminal) of the D flip-flop No1a.
The G signal is input. Output Q of D flip-flop No1a
Is input to the D terminal of the D flip-flop No1b in the next stage. The measurement modules attached to No2 and No3 have the same configuration.

The relay circuit RL1 includes a relay RL11 and an FE connected in series, which are inserted between the relay power source and the common line.
It is composed of TQ1. The drain of Q1 is a relay R
It is connected to the coil of L11, the source of Q1 is connected to the common line, and the gate of Q1 is D flip-flop No1a.
It is connected to ^- (abbreviated as Q) of the inverted output Q. In addition,
The other measurement modules have the same configuration.

The ID determining operation in such a configuration will be described below. Note that FIG. 3 is a time chart for explaining the operation. (1) When the power is turned on, the relay power supply Relay-OF
The voltage of F rises. However, at this time, the output of the flip-flop is indefinite, and the communication relay RL11 (RL1
2, RL13) does not always turn off. (2) The reset signal RES from the control unit 400 determines the output of the flip-flop and the FET
(Q1) turns on. This causes relay RL11 to be O
It becomes FF.

(3) The control unit 400 sets the signal SIG to High level (hereinafter referred to as H level). The H level signal of SIG is latched at the rising edge of CLK. As a result, the relay RL11 is turned on, and the communication bus 402 branching to the insulating component and the communication low-insulation circuit are connected. The output of the D flip-flop is held until the next rise of CLK, and the connection with the communication bus 402 is held. During this period, relays other than the No. 1 measurement module are OFF.

(4) SIG becomes Low level (hereinafter referred to as L level) before the next rising of CLK. In addition,
When used in the bus disconnection type of FIG. 1, the H level is fixed. As a result, all the relays up to the target measurement module can be turned on. (5) The CPU of the control unit 400 issues an interrogation signal via the communication bus 402. (6) Only the communicable measurement module (the first measurement module is No1) returns an acknowledge signal (ACK: reception completion).

(7) When operating normally, only one measurement module should be able to communicate. If another measuring module returns ACK and a collision occurs, it is an abnormal operation. In this case, it restarts from reset. (8) The address is sent to the measurement module with which the CPU can communicate. (9) The measurement module writes an address in a control circuit (not shown) on the insulation potential side, and returns an ACK signal to the CPU after the writing is completed.

(10) When the CPU receives the ACK signal, it sends out (up) one CLK. As a result, the communication with the No. 1 measurement module is turned off. (11) The CPU increments CLK by 1. This enables communication with the measurement module attached to No2.
After that, the same operations as (3) to (11) are repeated to determine the ID. However, the module ID other than 1
When deciding, the SIG signal remains at the L level. The IDs of the other measurement modules are sequentially determined by the same operation as above.

FIG. 5 shows another embodiment of the control circuit 130a. FIG. 6 is a time chart of the operation. The difference from the configuration of FIG. 3 is that the D flip-flop has three stages (No1a, No1b, No1c). In the embodiment of FIG. 3, if the characteristics of the flip-flops vary, the operation may become unstable. Therefore, with the configuration shown in FIG. 5, SIG is output over a period of 2 CLK. However, when the bus disconnection type of FIG. 1 is used, it is always fixed at the H level. As a result, in the case of FIG. 1, all the relays up to the target measurement module can be turned on.

The operation in such a configuration is similar to that of the embodiment shown in FIG. In this embodiment, when the signal of the flip-flop changes, the output of the immediately preceding flip-flop maintains a fixed value, so that the reliability is improved as compared with the case of the embodiment of FIG.

The above description merely shows specific preferred embodiments for the purpose of explaining and exemplifying the present invention. Therefore, the present invention is not limited to the above-mentioned embodiment, and many modifications are made without departing from the essence thereof.
It also includes deformation.

For example, a control circuit relay, FE
Circuits such as T and flip-flops are necessary at the time of determining the address ID, but are unnecessary for most of the period during which the measurement module is performing the measurement operation. Therefore, it is desirable to turn off the power supply to the circuit when not in use, and such a configuration may be adopted. In this case, in order to enable communication even when the power supply on the control circuit side is OFF, a normally closed relay is used.

Further, all of the above-mentioned embodiments are of a system whose main purpose is to disconnect communication. But (1)
Turn on only the function of the measurement module that determines the address, and turn off the measurement modules that do not determine the address.
(2) Alternatively, there is another realization means in the sense that the measurement modules after the determined measurement module are turned off.

For example, the same purpose can be achieved by turning on / off the main power supply line to supply or stop the power supply to each measurement module. In this case, the power supply line on the control circuit 130a side shown in FIG.
That is, the power line for the relay and the power line for the control circuit (neither are shown) must always be turned on when the address ID is determined.

It should be noted that the present invention is not limited to the measuring module and the measuring module mounted measuring instrument in the above embodiment, and other modules such as a control output module, a digital I / O module, a communication module and the like may be used. It can also be widely applied to equipped module-mounted equipment.

[0055]

As described above, the present invention has the following effects. (1) For the bus ON / OFF type, the module ID is determined using a low breakdown voltage insulation mechanism without using an additional high breakdown voltage insulation mechanism such as a photocoupler seen in the conventional example. You can Since the low breakdown voltage insulation mechanism is generally smaller than the high breakdown voltage insulation mechanism, the device can be downsized. (2) Bus ON for individual communication ON / OFF type
Reliability is improved compared to the / OFF type. Also, the communication protocol can be simplified depending on the usage.

(3) When a shift register composed of two flip-flops is used as the control circuit in the individual communication ON / OFF type, there is an advantage that the control circuit can be manufactured with a simple component structure. In addition,
When the shift register is composed of three flip-flops, the reliability can be improved more easily than when it is composed of two flip-flops.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of a measuring module-mounted type measuring instrument according to the present invention.

FIG. 2 is a main part configuration diagram showing another embodiment of the present invention.

FIG. 3 is a diagram showing details of a control circuit.

FIG. 4 is a time chart for explaining the operation of the control circuit shown in FIG.

FIG. 5 is a configuration diagram showing another embodiment of the control circuit.

6 is a time chart for explaining the operation of the control circuit shown in FIG.

FIG. 7 is a configuration diagram showing an example of a conventional measuring instrument.

FIG. 8 is a configuration diagram showing another example of a conventional measuring instrument.

[Explanation of symbols]

100 measuring modules High voltage insulation circuit for 110 power supply 120 High breakdown voltage insulation circuit for communication 130, 130a control circuit 140 Low voltage insulation circuit 300,400 control unit 301,401 Power bus 302,402 communication bus RL1, RL2, RL3 relay circuit Q1, Q2, Q3 FET RL11, RL12, RL13 relay No1a, No1b, No1c, ~ No3c D-type flip-flop

Claims (8)

[Claims] 1. A power supply high withstand voltage insulation circuit and a communication high voltage withstand voltage insulation circuit for high voltage insulation with a power supply bus and a communication bus, respectively, and means for turning on / off the power supply bus or the communication bus on the common potential side. A method for determining the IDs of a plurality of modules that are connected in a stacking manner, and when determining the IDs, turn on the power supply bus of each module connected to the preceding stage and power the modules connected to the latter stage of the target module. After turning off the bus to enable power supply to the target module, or turning on the communication bus of each module connected to the preceding stage and turning off the communication bus of the module connected to the latter stage of the target module Module ID, characterized in that the ID of the target module is determined after enabling communication to the module How to decide. 2. A plurality of modules comprising a power supply bus and a communication bus, and a power supply high-voltage insulation circuit and a communication high-voltage insulation circuit that perform high-voltage insulation, respectively, can be connected in a stacking manner, and each module can be connected. A module-mounted device configured to automatically determine an ID, wherein each module turns on / off a communication bus at an output end side.
A low withstand voltage insulation circuit that performs F and a control circuit that controls ON / OFF of the low withstand voltage insulation circuit according to a signal from the communication bus on the input end side are provided on the common potential side, respectively. A module-mountable device characterized in that a target module is made communicable and an ID can be determined by turning on a low-voltage insulation circuit of a connected module. 3. A plurality of modules comprising a power supply bus and a communication bus, and a high-voltage insulation circuit for power supply and a high-voltage insulation circuit for communication, which perform high-voltage insulation, respectively, can be connected in a stacking manner, and each module can be connected. A module-mounted device configured to automatically determine an ID, wherein each module turns on / off communication individually.
Relay circuit to FF and ON / OFF of this relay circuit
A control circuit for controlling the ID is provided, and when the ID is determined, communication can be performed by operating the relay circuit.
A module-mounted device, characterized in that it is configured to make a D decision. 4. The control circuit of each module comprises:
A shift register using a flip-flop is provided, the ON / OFF of the relay circuit can be controlled by an output signal from the shift register, and the shift registers between the modules are connected in series. The module-mounted device according to claim 3. 5. The module mountable device according to claim 3, wherein the shift register of the control circuit is configured by connecting two or three stages of flip-flops in series. 6. The module mountable device according to claim 3, wherein the control circuit is configured to operate only when an ID is determined. 7. The module mountable device according to claim 6, wherein the relay of the relay circuit is a normally closed type relay. 8. A plurality of modules comprising a power supply bus and a communication bus, and a high-voltage insulation circuit for power supply and a high-voltage insulation circuit for communication, which perform high-voltage insulation respectively, can be connected in a stacking manner, and each module can be connected. A module-mounted device configured to automatically determine an ID, and configured to individually control a power bus of each module to supply or stop power when determining an ID of a module. A module-mounted device characterized in that