JPH0439682B2 - - Google Patents

Description

[Detailed description of the invention]

[Technical Field of the Invention] The present invention relates to a control device that performs control over a shared range in response to command data given via a transmission line from a higher-level device such as a central control device. [Prior Art] Recently, in large-scale structures such as hotels and buildings, or large-scale production facilities, systems have been developed in which control devices are provided for each part or each control purpose, and these are centrally managed by a host device. Each control device is connected to a higher-level device by a transmission line, and performs control according to command data from the higher-level device. However, if command data from the higher-level device cannot be received due to a power outage, failure, abnormality in the transmission path, etc., the higher-level device will control the control state immediately before the failure state in order to continue control by the control device. In response to the occurrence of a failure in a host device, the control device switches control decisions to a safe direction and continues control in accordance with this. However, conventionally, in response to the occurrence of a failure on the host device side, all control devices transition to a backup mode that is fixedly determined as one of the above, and depending on the control device, other In some cases, a different backup mode is required, resulting in inconvenient drawbacks. [Summary of the Invention] The present invention has the purpose of fundamentally solving the above drawbacks of the conventional technology, and provides multiple types of backup modes in which the control device performs its own control without depending on command data given from a host device. These are prepared and stored in the memory, and when one of them is selected, the control unit reads the selected backup mode from the memory and performs control according to the contents. The present invention provides an extremely effective control device. [Example] Hereinafter, details of the present invention will be explained with reference to figures showing examples. Table 1 shows the backup modes, which are stored in the memory, one of which is selected according to the operator's instructions via the terminal device, and the selected mode is read out from the memory by the control unit. , control is performed according to the contents. For example, when a mode MO is specified by an operator via a terminal device, the control section reads out the control contents of the mode MO from the memory, and performs control according to the contents.

[Table] Figure 1 is a flowchart of the control situation according to the selections in the previous table.
“M1?” 202, “M2?” 203 decisions are made sequentially,
Steps 201 and 202 are NO and step 203 is YES
In other words, if mode M2 is specified, a timer or the like is used to check whether a predetermined word representing command data etc. from the host device does not arrive for a certain period of time or not, according to "Unable to receive predetermined word?" 211. In other words, it determines whether the host device is normal or abnormal, and if this becomes YES (high-order device abnormality),
Control "221" is performed based on the reason data as shown in FIG. regardless of whether the host device is normal or abnormal.”
Control ``221'' is performed based on the reason data. Also, if step 201 is YES, that is, if mode MO is specified, the same as step 211 is ``unable to receive predetermined word?''. 231 is made, and in response to YES, the control output is determined 232 based on the previous command data held in the RAM 3 (see Figure 2). Depending on whether it warms up within the specified time or not, "Reboot?" ” 233. In other words, the power supply due to power outage/restoration.
The rise of the power supply voltage in the control device in response to OFF/ON, and the rise in the power supply voltage in the control device in response to the OFF/ON of a mounted power switch (not shown) during maintenance, inspection, etc. are performed in step 233. Restart at (self-restart)
It is judged as. In other words, the supply voltage
When turned off, the control device loses its function (the data on the RAM 3 is backed up by the battery 11), and when the supply voltage is turned on, the control device starts its control. This change in the power supply voltage from OFF to ON, that is, the rise of the power supply voltage, is detected as a restart in step 233. If the judgment in step 233 is YES, the current status of each controlled device (for example, ON/OFF state) is determined by the control input "I ₁ - _{I o} check" 241, and it is determined that it matches the "I ₁ - I _o check" 241. Then, control output determination"242 is performed. That is, at the time of restart, in order to maintain continuity of control (to once match the control states), control output data to each controlled device is determined to be the same as the current control state. and,
``Storing the control output data obtained in this way to the memory'' 251 is performed. This is read out and "control output transmission" 252 is performed. However, if step 231 is NO, "determine control output based on command data" 261 is performed, and the process moves to step 251 and subsequent steps. For the above, step 201 is NO and step
If 202 is YES, that is, if mode M1 is specified, it is determined whether "predetermined word cannot be received?" 271 as in step 211, and if NO, the process moves to step 261, and if YES, the process proceeds to step 271.
As in 233, check “Reboot?” 272, and if this is NO, proceed to step 232, but YES
If so, move on to step 252 and read the memory (RAM
3) Send out the control output data held in it. For example, if a power outage occurs when mode M1 is specified, the command data immediately before the power outage occurs is held in RAM3 as control output data, and this held control output data is used for "restart". In response to YES in step 272, it is sent out in step 252. After sending the control output data in step 252, general "PID (proportional, integral, differential) control" is performed based on the set value in RAM 3 and control inputs I ₁ to _{I o.}
Perform step 281 and return to step 201. Therefore, in mode MO, in response to the restart of the control device, control is performed that matches the current state of each part, and then the control state is gradually changed to based on the set value.
To prevent the response of the controlled equipment from being sudden, when performing maintenance or inspection of the control device, turn off the power to the control device, and then turn off the power to the control device.
This is suitable when restarting by turning ON. Further, modes M0 to M3 may be designated depending on the situation, but M3 is convenient when the control device is to perform its own control all the time. FIG. 2 is a block diagram showing the configuration of the control device, in which a processor such as a microprocessor (hereinafter referred to as CPU) 1 used as a control unit, a fixed memory (hereinafter referred to as ROM: Read Only Memory) 2,
Variable memory (hereinafter referred to as RAM: Random Access
Memry.) 3. Interface (hereinafter referred to as I/
F) 4 to 7 and clock circuit (hereinafter referred to as CLK)
CPU1 and CLK8 are connected based on the clock pulses generated by the oscillator (hereinafter referred to as OSC)9.
A battery 11 is connected to the RAM 3, and even in the event of a power outage, the data in the RAM 3 is retained by backing up the power supply. In addition, a terminal device (hereinafter referred to as TE) 12 having a keyboard, display, etc. is connected to the I/F 4,
A host device 22 is connected to the I/F 5 via a transmission line 21, and data is sent and received with the host device 22 through the I/F 5.
Detection outputs from various sensors and detection outputs indicating the current status from various controlled devices such as electric valves and dampers are given as control inputs _I1 to _Io , and from I/F7, each Control outputs O ₁ to _{O o} are sent to the devices to be controlled. Note that the ROM2 stores instructions and each data listed in Table 1, and the RAM3 is divided into a plurality of areas, and each area stores each data of setting values, control output data, etc. . Here, the CPU 1 executes instructions in the ROM 2, gives priority to command data from the host device 22 given via the transmission line 21, and receives data from the TE 12 via I/F 4 and control input via I/F 6. Depending on I ₁ to I _o , select the required data.
Makes control decisions while accessing RAM 3, sends control outputs O ₁ to _{O o} via I/F 7,
It controls each controlled device, and TE12
Depending on the operation, display data is sent from the I/F 4 and displayed by the TE 12. . Incidentally, the timer, counter, etc. are configured in software by the CPU 1 and the RAM 3, and their time setting, activation, and counting are performed as necessary. FIG. 3 is a flowchart of the control status by the control unit of the control device, in which a timer or the like is used to indicate that a predetermined word from the host device is not received for a certain period of time using a “predetermined word unreceivable?” 101. If this is YES, a separate “timer start” 102 is performed, and in response to this “time up?” 103 being YES, the target item (hereinafter referred to as point) of the command data stored in the RAM 3 is activated. ) Set i to the counter with "i = 1" 104, and perform "read out reason data of i from memory" 105 for the reason data indicating the cause of the occurrence of the command data, which has been previously stored in RAM 3 in correspondence with the command data. Based on this, it performs "reading of control contents according to the reason data" 106 from ROM2, and then "updates the control output of i according to the control contents" 107, thereby corresponding to point i in RAM3. Update the control output data that was
If the judgment “i=n?” 108, which determines whether the above processing has been performed up to all points n, is NO, “i=i+
1" 109, and repeat steps 105 and after. If step 108 is YES, "1 to n control output transmission" 110 transmits the control output data in RAM 3 for each point. Table 2 shows an example of reason data indicating the cause of the command data, to which control details are added and stored in the RAM 3.

【table】

Claims (1)

[Scope of Claims] 1. A control device that performs control according to command data given from a host device via a transmission line, comprising a memory storing a plurality of backup modes independently controlled by the control device; a selection means for selecting a designated backup mode from among the backup modes stored in the memory; and a selection means for reading the backup mode from the memory in accordance with the selection by the selection means, and applying the contents of the backup mode to the backup mode. 1. A control device comprising: a control section that performs corresponding control.