JPH02125304A - Programmable controller - Google Patents

Abstract

PURPOSE:To reduce the labor of system operation by detecting the incoming order of signals sent from signal lines, whose signal transmission systems are known, by an incoming order detecting means and automatically selecting identification means of reception signals in accordance with detection results by a control means. CONSTITUTION:Plural signal identification means 100 corresponding to respective signal transmission systems which individually receive signals transmitted through plural signal transmission lines different in signal transmission system and can identify contents of received signals, an incoming order detecting means 200 which detects the incoming order of respective signals, and a control means 300 which instructs the operation start to only the identification means 100 corresponding to the signal transmission system of the first incoming signal out of plural identification means 100 in accordance with detection results are provided. The incoming order of signals sent from signal lines whose signal transmission systems are known is detected by an incoming order detecting means 200, and the control means 300 automatically selects identification means 100 of reception signals in accordance with detection results. Thus, the labor of the system operation of a programmable controller is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a programmable controller, and more particularly to a programmable controller that automatically selects a plurality of signal lines with different transmission methods in the order in which signals arrive. [Prior Art 1] A conventional programmable controller exchanges signals with a device to be controlled using a serial signal transmission method, and performs arithmetic processing on the received signals after converting them into parallel signals. Regarding serial signal transmission methods used in such programmable controllers, there are several known international standards and communication standards established by manufacturers. However, when connecting multiple controlled devices with different signal transmission methods to a programmable controller using signal lines,
On the programmable controller side, the central processing unit (
The CPU (CPU) executes each identification program according to the transmission method to determine the numerical data and control commands of the parallel-converted signal. [Problem to be solved by the invention] However, the conventional programmable controller C
Since the PIJ itself cannot determine which signal transmission method the received signal was sent using, the operator had to input an instruction for the signal transmission method using a changeover switch or the like. As a result, if the operator incorrectly enters the signal transmission method,
Conventional programmable controllers have had issues that need to be resolved, such as system malfunctions or signal lines between the control target equipment being destroyed and the system having to be stopped. Therefore, the purpose of the present invention is to eliminate such problems and provide a programmable controller that can automatically receive transmission signals from controlled devices using different signal transmission methods.
It's all about working together. [Means for Solving the Problem] In order to achieve such an object, the present invention individually receives each signal transmitted through a plurality of signal transmission paths using different signal transmission methods, and analyzes the contents of the received signal. a plurality of signal identification means corresponding to each signal transmission method capable of identifying the signals, an arrival order detection means for detecting the arrival order of each signal, and a plurality of identification means according to the detection result detected by the arrival order detection means. The present invention is characterized by comprising a control means for issuing an operation start instruction only to the identification means of the signal transmission method corresponding to the earliest arriving signal among the signals. [Function] The present invention detects the arrival order of signals sent from a signal line whose signal transmission method is known by an arrival order detection means,
Since the control means automatically selects the means of identifying the received signal based on the detection result, the operator no longer needs to input instructions for the signal transmission method as in the past, and as a result, the effort required to operate the programmable controller system is reduced. is reduced. [Embodiment 1] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows the basic configuration of an embodiment of the present invention. In FIG. 1, 100 individually receives each signal transmitted through a plurality of signal transmission paths with different signal transmission methods,
A plurality of signal identification means corresponding to each of the signal transmission methods are capable of identifying contents of received signals. Reference numeral 200 denotes an arrival order detection means for detecting the arrival order of each of the signals. 300 instructs only the identification means of the signal transmission system corresponding to the signal that arrives first among the plurality of identification means to start operation according to the detection result detected by the arrival order detection means. It is a control means. FIG. 2 shows a specific circuit configuration related to the present invention in an embodiment of the present invention. In FIG. 2, reference numeral 1 denotes a CPU that determines the numerical values and control commands of signals sent by each signal transmission method. CPIJ
Reference numeral 1 denotes a read-only memory (ROM) 4. By executing a discrimination program for each signal transmission method stored in a read-only memory (ROM) 4, the above-mentioned signal content discrimination processing is performed. Since the identification processing programs for each of these signaling systems are well known, detailed explanations will be omitted. Reference numeral 2 denotes an interrupt controller that determines the order of arrival of signals sent from the controlled equipment via the first to third signal lines A1 to A3. Interrupt controller 2 is CPU1
Informs the type of signal line that received the first call. In this example, the first to third interrupt input terminals of the CPU 1 are connected to the interrupt controller 2, and the first to third interrupt input terminals are connected to the first signal line 21 to the third signal line fL3, respectively. It is matched. 3 is a human interface (Ilo) consisting of a serial-parallel (S/P) converter 3-1 and an OR circuit 3-2.
It is. l103 connects the first to third signal lines to the OR circuit 3-
2, and the serial signals transmitted from the first to third signal lines via the OR circuit are converted into parallel signals by the S/P converter 3-1. The output signal of l103 is output to CPU1 via data bus 15, and determined by CPU t. 4 is read-only memory (ROM), CPII
1, the control procedure shown in FIG. 3 and a discrimination program for each signal system are stored in advance. 5 is random access memory (RAM), l10
The identification content results of the signals input from 3 are temporarily stored. R
The OM 4 and the RAM 5 share a data bus 15° and an address bus 4, and read and write data under the control of the CPU. Next, the operation of this embodiment will be explained with reference to the flowchart shown in the third figure. In FIG. 3, for example, when a signal is transmitted to the first signal line J11, the interrupt controller 2 (:PU
INT1 outputs an interrupt signal to the first interrupt input terminal INT1. When the CPU i detects this interrupt input, it executes the signal identification program corresponding to the signal transmission method of the first (8-segment line λ1) from the ROM 4. In other words,
CPU 1 identifies the contents such as control commands from the transmission signals sequentially input from l103, and then sends the identification results to R.
Temporarily stored at 5 AM. (Step S1→5ll). Also, when the programmable controller receives a signal from the second or third (X-segment line 12.ρ3), the interrupt controller 2 outputs an interrupt signal to the corresponding interrupt input terminal of CPU i,
1 can execute a control program corresponding to the signal transmission method. Further, after receiving the transmission signal, the CPt11 resets the interrupt controller 2, returns it to the initial state, and waits for the next reception. In this embodiment, the interrupt controller 2 detects the arrival order of signal lines whose signal formats are known in advance, so the CPU 1 determines which signal format the received signal is based on the determination result from the interrupt controller 2. can be automatically detected. Possible applications of this embodiment are as follows. l) In this embodiment, the arrival order of a plurality of serial signals of different signal transmission methods is determined by a known circuit called an integrated interrupt controller.
The arrival order determination circuit may be configured with a flip-flop and a logic circuit. 2) In this embodiment, an example was shown in which the CPt 11 identifies the content of the transmission signal in each signal transmission method, but the signal content may be identified by a dedicated identification circuit for each, and in this case, the interrupt controller 2 The configuration is such that the identification circuit is selected according to the determination result. [Effects of the Invention] As explained above, in the present invention, the arrival order of signals sent from a signal line whose signal transmission method is known is detected by the arrival order detection means, and the reception order is detected based on the detection result. Since the control means automatically selects the identification means for the received signal, the operator does not have to input instructions for the signal transmission method as in the past, and as a result, the effort required to operate the programmable controller system is reduced. Ru.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the basic configuration of an embodiment of the present invention, FIG. 2 is a circuit diagram showing a specific circuit configuration of an embodiment of the present invention, and FIG. 3 is a control procedure executed by the CPt11 shown in FIG. 2. It is a flowchart which shows. 1...CPt1. 2...Interrupt controller, 3...Ilo, 4...ROM. 5...RAIA.

Claims (1)

[Claims] 1) A plurality of signals corresponding to each of the signal transmission methods that individually receive each signal transmitted through a plurality of signal transmission paths with different signal transmission methods, and can identify the contents of the received signals. an identification means; an arrival order detection means for detecting the arrival order of each of the signals; and according to a detection result detected by the arrival order detection means,
A programmable controller characterized in that the programmable controller comprises a control means for issuing an operation start instruction only to the identification means of a signal transmission system corresponding to the signal that arrives first among the plurality of identification means.