JPH0525502U - Multi-point controller - Google Patents

Abstract

(57) [Summary] [Purpose] To facilitate the formation of arbitrary connection relationships for multiple controllers. [Structure] Unit controllers 15 to 21 are measured values PV1 to P
The manipulated variables MV1 to MVn and / or their measured values PV1 to PVn calculated by PID from Vn and the set values SV1 to SVn are output. The switching circuits 23-29 are for each unit controller 15-
21 manipulated variables MV1 to MVn and measured values PV1 to
Unit controller 15 ~ by switching and selecting one from PVn
It outputs to 21 and connects between unit controllers 15-21. The setting circuit 31 sets the connection relationship between the unit controllers 15 to 21 and outputs it to the switching control circuit 33. The switching control circuit 33 controls the switching circuits 23 to 29 so that the set connection relation of the unit controllers 15 to 21 can be obtained.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a multipoint controller that outputs a manipulated variable for operating a controlled object from a plurality of measured values and set values, and relates to, for example, improvement of a multipoint controller that controls the temperature of an extruder.

[0002]

[Prior Art]

 This type of multi-point controller is used by itself, in combination with multiple multi-point controllers, or by connecting other external equipment such as a pattern setter that outputs patterned set values. There are cases where As shown in FIG. 10, for example, an extruder to be controlled by the multi-point controller heats the cylinder portion 1 by one or a plurality of heaters 3 and 5 arranged in the cylinder portion 1, and the heaters 3 and 5 are heated. The molten resin is extruded from the nozzle portion 7 by finally controlling the temperature of the tip nozzle portion 7 away from the nozzle portion 7. In such an extruder, since the heaters 3 and 5 and the nozzle portion 7 are separated from each other, there is a large delay time or dead time from the heating by the heaters 3 and 5 until the temperature of the nozzle portion 7 changes. Occurs.

Therefore, in order to control the temperature of the extruder, conventionally, a plurality of multipoint controllers are connected in cascade and used. That is, as shown in FIG. 10, a master controller 9 is provided which outputs a control amount MVa by performing PID calculation from the primary measurement value PVa and the set value SVa from the temperature measuring unit TCa arranged in the nozzle unit 7, and the heater 3, A slave that calculates PID from secondary measurement values PVb and PVc from temperature measurement units TCb and TCc arranged near 5 and set values SVb and SVc to calculate operation amounts MVb and MVc for operating the heaters 3 and 5. Controllers 11 and 13 are provided, and in the slave controllers 11 and 13, the PID calculation is performed by changing the set values SVb and SVc according to the control amount MVa from the master controller 9.

Along with stable temperature control of the cylinder unit 1 by the slave controllers 11 and 13, and by controlling the system from the cylinder unit 1 to the nozzle unit 7 by the master controller 9, a large time delay or Responses are improved by reducing the effects of some disturbances. FIG. 10 shows a master controller 9 and a slave controller, although a master controller 9 and slave controllers 11 and 13 correspond to one master controller 9 in a cascade structure of 1: n. 11, or a configuration in which the master controller 9 and the slave controller 13 are connected in a 1: 1 cascade is also implemented.

[0005]

[Problems to be solved by the device]

 However, in the above-mentioned conventional cascade-type multipoint controller, the functions of the master controller 9 and the slave controllers 11 and 13 are fixed, and the master controller 9 and the slave controllers 11 and 13 have one function. It was difficult to change the configuration between the 1: 1 cascade connection configuration and the 1: n cascading configuration, or to change the number of connections of the slave node totals 11 and 13 in the 1: n cascade connection configuration. Therefore, the master controller 9 and the slave controllers 11, 13 do not have a degree of freedom in the configuration of the cascade connection, and it is difficult for the customer to change the configuration of the cascade connection. Flexible and proper control was difficult.

Further, in a configuration in which an external device such as a pattern setter is connected to the multipoint controller, the multipoint controller is provided with a dedicated remote terminal for inputting a signal from the external device, and the external device is connected to the remote device. It is necessary to connect, especially when combining multiple multipoint controllers, it is necessary to change the actual connection state of the external device and each multipoint controller according to the desired control mode. However, there is a drawback that it becomes complicated. The present invention has been made in order to solve such a conventional drawback, and it is possible to easily configure an arbitrary connection relationship between a plurality of controllers and to make it possible to perform appropriate control in accordance with various control targets. The purpose is to provide a point controller. Another object of the present invention is to provide a multi-point controller that can easily configure an arbitrary cascade connection relationship for controllers corresponding to a master controller and a slave controller.

[0007]

[Means for Solving the Problems]

 In order to solve such a problem, the present invention provides a plurality of unit controllers that calculate and output a manipulated variable from a measured value and a set value and output the measured value and / or manipulated variable as a controlled variable. Multiple unit controllers that output manipulated variables by changing the value with the control amount from other unit controllers, and selectively switch each control amount from other unit controllers to the relevant unit controller. A switching circuit that switches and connects each unit controller by inputting, a setting circuit that sets the connection relationship between these unit controllers, and a switching circuit that controls the switching circuit so that these unit controllers have that connection relationship. And a control circuit.

Further, the present invention provides a unit controller corresponding to a master controller that outputs a manipulated variable based on a primary measurement value from a final control target and a predetermined set value from among the above-mentioned unit controllers. , 1: 1 and / or 1: n with a unit controller corresponding to a slave controller that is cascade-connected to this master controller and indirectly outputs the manipulated variable that operates the indirect controlled object that indirectly controls the final controlled object. The above setting circuit is formed so that (n is the number of arbitrary unit controllers other than the unit controller corresponding to the master controller) can be set, and the operation amount from the unit controller corresponding to the master controller is set as the control amount. The switching circuit is formed so that the cascade connection can be switched to 1: 1 and / or 1: n, and the unit controller has a 1: 1 and / or 1: n cascade based on the setting of the setting circuit. It is possible to form the switching control circuit so that the switching circuit can be controlled to have a connection relationship. Further, in the present invention, it is also possible to form each of the above unit controllers such that the input set value or control amount can be changed.

[0009]

[Action]

 In the present invention equipped with such means, when the connection relationship of the controlled variable between the unit controllers is set by the setting circuit, the switching control circuit is arranged so that the unit controllers are connected based on the setting. The control circuit selectively switches each controlled variable from another unit controller and inputs it to the relevant unit controller to switch and connect the unit controllers, and control from one unit controller. One of the measured values or manipulated variables is added to the other unit controller as a quantity, and the unit controller changes each set value by the control quantity from the other unit controller and outputs the manipulated variable.

Further, in the configuration in which each unit controller corresponds to the master controller and the slave controller and the setting circuit, the switching circuit and the switching control circuit are formed so as to be cascade-connected, the setting circuit has a 1: 1 ratio. Based on the and / or 1: n cascade connection, a plurality of unit controllers are connected to the 1: 1 and / or 1: n cascade connection via the switching circuit and the switching control circuit. Further, in the configuration in which each unit controller is formed so that the input set value or control amount can be changed, the influence of the set value or control amount can be changed.

[0011]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic block diagram showing an embodiment of a multipoint controller according to the present invention. In FIG. 1, each unit controller 15, 17, 19, 21 has the same configuration, and is operated by, for example, PID calculation from measured values PV1, PV2, PV3, PVn and set values SV1, SV2, SV3, SVn. It is possible to calculate and output the quantities MV1, MV2, MV3, and MVn, and to output the measured values PV1, PV2, PV3, and PVn. The measured values PV1 to PVn are the input measured values PV1 to PVn as they are, or the measured values PV1 to PVn are output as they are while suppressing the operation of the PID calculation circuit. The plurality of unit controllers 15 to 21 can change the set values SV1 to SVn by control amounts (operation amounts or measured values described later) from switching circuits 23, 25, 27, 29 described later. The quantities MV1 to MVn and / or the measured values PV1 to PVn are output to the switching circuits 23 to 29 as control quantities.

For each unit controller 15 to 21 and each switching circuit 23 to 29, only four (4 channels) are shown for convenience, but these numbers are arbitrary and the unit controller 21 and the switching circuit 29 are n. Is the second meaning. The setting circuit 31 is composed of a keyboard or the like arranged in the main body case of a multi-point controller (not shown), sets the connection relationship between the unit controllers 15 to 21, and outputs this to the switching control circuit 33. Yes, as the setting contents, specify the unit controller corresponding to the master controller and the unit adjuster corresponding to the slave controller from among the unit controllers 15 to 21 to set the cascade connection relationship and set the control amount. The unit controllers 15 to 21 for inputting the manipulated variables MV1 to MVn are designated. In the cascade connection, there is a 1: 1 relationship that is a combination of one unit controller corresponding to the master controller and one unit controller corresponding to the slave controller, and one unit controller corresponding to the master controller. There is a 1: n relationship, which is a combination of a plurality (n) of unit controllers corresponding to one controller to a slave controller, and a mixed form of these 1: 1 and 1: n relationships.

A plurality of 1: 1 or 1: n cascade connection relationships are possible even in a connection relationship of only 1: 1 or 1: n, and a 1: 1 and 1: n relationship can be mixed. Also, it is possible to set a plurality of connection relationships in either one or both. The specific setting state will be described later. As another setting content, the setting of the unit controllers 15 to 21 which inputs the measured values PV1 to PVn as the control amount from among the unit controllers 15 to 21, and further the manipulated variables MV1 to MVn or the measured values PV1 to PVn. There are settings for unit controllers 15 to 21 that input PVn. The switching circuits 23 to 29 selectively select and switch the manipulated variables MV1 to MVn or the measured values PV1 to PVn from the unit controllers 15 to 21, and output them to the unit controllers 15 to 21. A connection relationship is formed, and a cascade connection relationship is connected 1: 1 and / or 1: n, or is connected in series via the measured values PV1 to PVn, or a mixed connection form of these is formed. is there.

The switching control circuit 33 controls each of the switching circuits 23 to 29 so as to form the connection relationship among the unit controllers 15 to 21 set by the setting circuit 31. Although the switching control circuit 33 collectively controls the switching circuits 23 to 29 in FIG. 1, the switching circuits 23 to 29 are individually controlled. The external device 35 is, for example, a program setter that is configured separately from the multi-point controller of the present invention, and outputs the patterned output amount to each of the unit controllers 15 to 21, for example, the measured value to the unit controller 15. Is output (see FIG. 8). 2 is a block diagram showing the configuration of each of the unit controllers 15 to 21 and the connection relationship between the unit controllers 15 to 21 described above. For convenience, only the cascade configuration is shown and the external device 35 of FIG. Is omitted.

In FIG. 2, the unit controller 15 of channel 1 (CH1) includes a remote gain variable circuit RG1, addition circuits 37a and 37b, a local gain variable circuit LG1, a linearization circuit LI1 and a PID arithmetic circuit (see FIG. The unit controller 17 of the channel 2 (CH2) has a remote gain variable circuit RG2, adder circuits 41a and 41b, a local gain variable circuit LG2, a linearize circuit LI2 and It is formed of a PID calculation circuit 43. The unit controller 19 of the channel 3 (CH3) is composed of a remote gain variable circuit RG3, adder circuits 45a and 45b, a local gain variable circuit LG3, a linearize circuit LI3 and a PID operation circuit 47, and a channel n (CHn). The unit controller 21 includes a remote gain variable circuit RGn, adder circuits 49a and 49b, a local gain variable circuit LGn, a linearize circuit LIn, and a PID operation circuit 51.

Since each of the unit controllers 15 to 21 has the same configuration, the configuration of the unit controller 15 will be described and the description of the other unit controllers 17 to 21 will be omitted. The remote gain variable circuit RG1 to which the operation amount MV1, MV2, MV3 or MVn selectively input at the movable contact of the switching circuit 23 is input, is operated by varying the coefficient 0 to 1 with the gain of the operation amount, and the addition circuit 37a. The local gain variable circuit LG 1 changes the gain of the set value LS1 input as the local setting and outputs it to the adder circuit 37a. The adder circuit 37a adds the manipulated variable and the set value to set value SV1. And is connected to the adder circuit 37b. Since the manipulated variables MV1, MV2, MV3 or MVn input to the remote gain variable circuit RG1 are called remote set values, the switching circuits 23 to 29 function as remote setting circuits RS1, RS2, RS3 and RSn. ..

The linearizing circuit LI1 has a function of converting the measured value PV1 and outputting it to the adding circuit 37b. As a mode of conversion, a function of linearly converting the change of the measured value PV1 into a linear change or the measured value PV1. There is a buffer function that outputs the changes in The adder circuit 37b outputs the deviation of the outputs from the adder circuit 37a and the linearize circuit LI1 to the PID operation circuit 39. The PID operation circuit 39 performs the PID operation on the output from the adder circuit 37b to obtain the manipulated variable MV1. It is output. This manipulated variable MV1 is connected to an external controlled object (not shown) and each switching circuit 23-29. Although not shown, the variable control of the local gain variable circuit LG1, the remote gain variable circuit RG1 and the linearization circuit LI1 described above is performed by the switching control circuit 33 via the setting circuit 31, for example.

Remote gain variable circuits RG2, RG3, RGn, adder circuits 41a, 41b, 45a, 45b, 49a, 49b, local gain variable circuits LG2, LG3, LGn, linear in other unit controllers 17, 19, 21. The rise circuits LI2, LI3, LIn and the PID operation circuits 43, 47, 51 are similar to those of the unit controller 15. Each switching circuit 23 to 29 is a one-circuit multi-contact mechanical or non-contact type switch, and includes an open fixed contact (0) and a fixed contact (1) to which the manipulated variable MV1 from the unit controller 15 is connected. ), A fixed contact (2) to which the operation amount MV2 from the unit controller 17 is connected, a fixed contact (3) to which the operation amount MV3 from the unit controller 19 is connected, and an operation from the unit controller 21. It has a fixed contact (n) connected by the amount MVn, and selectively switches the cascade input to each unit controller 15 to 21 and is individually controlled by the switching control circuit 33. ..

The switching control circuit 33 controls the switching circuits 23 to 29 to select the open fixed contact (0) so that the unit controller set by the setting circuit 31 functions as a master controller. The controller controls to select any one of the fixed contacts (1) to (n) of the switching circuits 23, 25, 27 and 29 so that the controller functions as a slave controller. Therefore, when each of the switching circuits 23 to 29 is controlled by the switching control circuit 33, any one of the unit controllers 15 to 21 functions as a master controller and a slave controller, and at the same time, the master controller and the slave controller are controlled. The cascade connection configuration can be 1: 1 and / or 1: n. The unit controllers 15 to 21 and the switching control circuit 33 described above are formed by a so-called microcomputer including a CPU, a ROM storing an operation program of the CPU, a RAM storing data of an operating process of the CPU, and the like. It If the switching circuits 23 to 29 are electronic switches, they can be configured by a microcomputer including them.

Next, the operation of the multipoint controller according to the present invention will be described. First, a 1: 1 cascade connection configuration will be described with reference to FIG. The item LI of the linearize circuit is omitted in FIG. 3 (the same applies to FIGS. 4 and 5 below). In the setting circuit 31, the unit controllers 15 and 19 of channels (CH) 1, 3, and n-1 (not shown) are designated as master controllers, and the unit controllers 17 of channels (CH) 2, 4, and n are specified. , 21 are designated as slave controllers, the switching control circuit 33 controls the switching circuits 23 to 29, and the switching circuits 23 and 27 select the open fixed contact (0), while the switching circuits 25 and 29 are fixed. Select the contacts (1) and (n-1). Therefore, the unit controller 15 designated as the master controller is cascade-connected to the unit controller 17 designated as the slave controller, while the unit controller 15 designated as the master controller is slaved to the unit controller designated as the master controller. Unit controllers 21 designated as are connected in cascade to form a plurality of 1: 1 cascade connections as shown in FIG.

In FIG. 3, “1” in the item LG indicates the gain of the local gain variable circuits LG1 to LGn, and the set values LS1 to LSn input as the local set values are buffer-output as they are. Further, "0" and "1" in the item RG indicate the gains in the remote gain variable circuits RG1 to RGn, and the operation amounts MV1 to MVn input as remote setting values in "1" are output as a buffer as they are. And functions as a switch that cuts off the manipulated variables MV1 to MVn when "0". The same applies to "0" in the item LG in the following figures. However, by setting the remote gain variable circuits RG1 to RGn to “0”, at least the unit controller can be made to function as the master controller. Any value can be set.

Next, a 1: n cascade connection configuration will be described with reference to FIG. In the setting circuit 31, the unit controller 15 of the channel (CH) 1 is designated as the master controller, and the unit controllers 17, 19, 21 of the channels (CH) 2, 3, 4, n are designated as the slave controllers. When the designation is made, the switching control circuit 33 selectively controls the open fixed contact (0) by the switching circuit 23 and selectively controls the fixed contact (1) by the switching circuits 25, 27, 29, and 1: n as shown in FIG. The cascade connection of is configured. As described above, according to the present invention, by designating the cascade connection configuration by the setting circuit 31, any 1: 1 or 1: n arbitrary cascade connection configuration is possible. Moreover, a plurality of sets of 1: n cascade connection configuration or a mixture of 1: 1 and 1: n cascade connection configurations are possible, and it is not necessary to change the actual connection configuration of each unit controller 17-21. Absent.

In the present invention, the set values LS1 to LSn and / or the operation are set in the remote gain variable circuits RG1 to RGn, the local gain variable circuits LG1 to LGn and the linearization circuits LI1 to LIn in each unit controller 15 to 21. Since the quantities MV1 to MVn are variably formed, cascade connection control is possible in a wide range. For reference, a mode in which the unit controllers 15 to 21 are independently operated will be described with reference to FIG. In this configuration, the setting circuit 31 designates the unit controllers 15 to 21 of the channels (CH) 1 to n as master controllers, and the switching control circuit 33 causes all the switching circuits 23 to 29 to open fixed contacts (0). Is configured by selecting. Next, the serial connection configuration will be described through the measured values PV1 to PVn. FIG. 6 is a schematic block diagram showing a configuration in which a measurement value from one unit controller can be connected to another unit controller.

In this configuration, the unit controllers 15 to 21 can output measured values PV1, PV2, PV3, and PVn from the linearization circuits LI1 to LIn, for example, and the switching circuits 23, 25, 27, and 29. It is connected to the fixed terminals pv1, pv2, pv3, pvn, and each switching circuit 23 to 29 can selectively select only these measured values PV1 to PVn, or among the manipulated variables MV1 to MVn and measured values PV1 to PVn. It is possible to select one from the alternative. In FIG. 6, the illustration of the unit controllers 19 and 21 is omitted. The selection operation is set and switched by the setting circuit 31 and the switching control circuit 33 shown in FIGS. For each unit controller 15-21, if the measured values PV1-PVn are passed from the PID calculation circuits 39-51 as they are and added to the switching circuits 23-29 via the output lines from the manipulated variables MV1-MVn. , Will not increase the number of fixed terminals in switching circuits 23-29.

FIG. 7 illustrates the connection configuration including the operation LI of the above-described multi-point controller of FIG. 6 including the item LI of the linearization circuit. For example, as shown in FIG. 8, in the multi-point controller A of the present invention, the linear output amount of a preset pattern is input as the measured value PV1 from the external device 35 to the input terminal 53, and the other input terminals 55, Consider the case where the J-type and K-type thermocouples TC1, TC2, and TCn are input to 57 and 59 as measured values PV2, PV3, and PVn. In this configuration, since the measured value PV1 from the external device 35 is linear, "L" is set by the linearization circuit LI1 of the channel (CH) 1 and the buffer output is performed as it is, and the channel (CH) 2, 3 is output. If the connected thermocouples TC1 and TC2 are of the K type, the linearization circuits LI2 and LI3 are set to "K" and the linearization processing corresponding to the K type thermocouples TC1 and TC2 is performed.

On the other hand, if the thermocouple TCn connected to the channel (CH) n is a J type, the linearize circuit LIn is set to “J”, and the linearize process corresponding to the J type thermocouple TCn is performed. Note that “K”, “J”, and “L” set in the item LI are codes that specify the type of processing, and in reality, the corresponding coefficient or the like is set. In the multi-point controller having such a configuration, the output value from the external device 35 is input as, for example, the measured value PV1 from the unit controller 15, and the measured value PV1 is output to the other unit controllers 17 to 21. The set values LS2 to LSn in the unit controllers 17 to 21 can be changed. Therefore, the connection relationship can be arbitrarily set by the setting circuit 31 while the external device 35 is connected to the input terminal of the measured value without separately providing a remote terminal, so that an arbitrary program controller can be easily configured.

By the way, when the multipoint controller according to the present invention is implemented in a cascade configuration, as shown in FIG. 9, for example, the unit controller 15 is a master controller and the unit controller 17 is a slave controller. At the same time, a cascade connection configuration is possible in which the unit controller 17, which is a slave controller, is a master controller, and the unit controller 19 is a slave controller, which can be arbitrarily configured by the setting circuit 31 and the switching control circuit 33. is there. In the above-described embodiment, the example in which the switching circuits 23 to 29 are formed independently of the unit controllers 15 to 21 has been described, but in the present invention, the switching circuits are provided in the unit controllers 15 to 21. A configuration of forming 23 to 29 is also possible.

[0028]

[Effect of the device]

 As explained above, the present invention forms a plurality of unit controllers that output input measured values and / or calculated manipulated variables as control variables, and sets the set values to control variables from other unit controllers. The unit controller is formed so as to output the manipulated variable by changing with, and a switching circuit for connecting and switching between the unit controllers by selectively switching each control amount from other unit controllers and connecting them. Since a setting circuit that sets the connection relationship between unit controllers and a switching control circuit that controls the switching circuit to form the connection relationship are provided, any connection relationship can be easily configured between multiple unit controllers. Therefore, it becomes possible to perform appropriate control according to various control targets. Further, in the configuration in which each unit controller is made to correspond to the master controller and the slave controller and the setting circuit, the switching circuit and the switching control circuit are formed so as to connect them in cascade, a plurality of unit controllers are provided. Since it is possible to easily change the configuration of any cascade connection, it is possible to configure only any cascade configuration or a mixture with a remote configuration. Further, in the configuration in which each of the above-mentioned unit controllers is configured so that the input set value or control amount can be changed, the influence of the set value or control amount can be changed, so that a wider range of control is possible.

[Brief description of drawings]

FIG. 1 is a schematic block diagram showing an embodiment of a multipoint controller of the present invention.

FIG. 2 is a block diagram showing a configuration of each unit controller in FIG. 1 and a connection relationship between these unit controllers by taking a cascade configuration as an example.

FIG. 3 is a diagram showing a setting example of a cascade connection relationship for each unit controller in FIG.

FIG. 4 is another diagram showing a setting example of a cascade connection relationship for each unit controller of FIG.

5 is another diagram showing another connection relation setting example for each unit controller in FIG. 2. FIG.

FIG. 6 is a schematic block diagram showing a configuration of each unit controller of FIG. 1 and another connection relationship between the unit controllers.

7 is a diagram showing a setting example of connection relations in the multipoint controller of FIG.

FIG. 8 is a diagram showing a connection configuration between a multipoint controller and an external device with reference to FIGS. 6 and 7.

FIG. 9 is a schematic block diagram showing another cascade connection configuration of the multipoint controller according to the present invention.

FIG. 10 is a block diagram showing a schematic configuration in which a conventional multipoint controller is used in an extruder.

[Explanation of symbols]

1 Cylinder part 3, 5 Heater 7 Nozzle part 9 Master controller (primary controller) 11, 13 Slave controller (secondary controller) 15, 17, 19 Unit controller (master controller or slave controller) 23, 25, 27, 29 Switching circuit 31 Setting circuit 33 Switching control circuit 35 External device 37a, 37b, 41a, 41b, 45a, 45b, 4
9a, 49b Adder circuit 39, 43, 47, 51 PID operation circuit 53, 55, 57, 59 Input terminal A Multi-point controller LG1, LG2, LG3, LGn Local gain variable circuit LI1, LI2, LI3, LIn Linearization circuit RG1, RG2, RG3, RGn Remote gain variable circuit TCa, TCb, TCc Temperature measurement unit TC1, TC2, TCn Thermocouple

Claims (3)

[Scope of utility model registration request] 1. A plurality of unit controllers for calculating and outputting a manipulated variable from a measured value and a set value and outputting the measured value and / or the manipulated variable as a controlled variable, wherein the set value is another unit controller. A plurality of unit controllers that output the manipulated variable by changing the control amount from one of the unit controllers, and the other controller units from the other unit controllers are selectively switched and input to the unit controller. A switching circuit for switching and connecting unit controllers, a setting circuit for setting a connection relationship between the unit controllers, and a control circuit for controlling the switching circuit so that the unit controllers have a connection relationship based on the setting of the setting circuit. And a switching control circuit for controlling the multipoint controller. 2. The setting circuit, for the unit controller, a unit controller corresponding to a master controller that outputs a manipulated variable based on a primary measurement value from a final control target and a predetermined set value, and the master controller. A unit controller corresponding to a slave controller that outputs an operation amount that operates an indirect control target that indirectly controls the final control target based on an operation amount from the master controller that is cascade-connected to a meter,
1: 1 and / or 1: n (n is an arbitrary number of unit controllers other than the unit controller corresponding to the master controller), and the switching circuit corresponds to the master controller. The operation amount from the unit controller is switched as the control amount, and the cascade connection relationship of each unit controller can be switched to 1: 1 and / or 1: n, and the switching control circuit is configured to set the setting circuit. 2. The multi-point controller according to claim 1, wherein the unit controller is formed so that the switching circuit can be controlled so that the unit controller has a cascade connection relationship of 1: 1 and / or 1: n. 3. The multi-point controller according to claim 1, wherein each of the unit controllers is formed so that the input set value or control amount can be changed.