JPH04321105A - Positioning control method - Google Patents

Abstract

PURPOSE:To reduce the burden of a host equipment when a servo motor is driven with the command of the host equipment for execution of the positioning control. CONSTITUTION:The positioning control is carried out by reading out the stored data including the moving amount and the feeding velocity of a servo motor based on an instruction given from the host equipment. In such conditions, the signal of plural bits is applied in the conventional positioning control. In this new control method, however, the application of a signal of only a single bit is sufficient (steps S1-S4). Thus, no start signal is required and the burden of the host equipment is reduced. Furthermore the conventional control method is also available when the 1-bit signal is not used.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a positioning control method for positioning a servo motor at a predetermined position.

0002

2. Description of the Related Art FIG. 2 is a schematic diagram showing a general example of a servo system, in which 1 is a sequencer as a host device, 2 is a controller, and 3 is a servo motor. Here, the controller 2 performs positioning control of a positioning target (not shown) by controlling the servo motor 3, but the data for positioning including the movement amount and feed rate of the servo motor 3 in this case is stored in the internal memory. For example, the information is stored as shown in FIG. FIG. 4 is a flowchart for explaining the operation of FIG. That is, when a data number for selecting memory data is given in parallel from the sequencer 1 in a BCD code in step S1, the controller 2
accesses the memory based on this data number and reads the movement amount xi and feed amount vi corresponding to that number. Next, when a start signal is input from the sequencer 1 in step S3, the servo motor 3 is driven in step S4 in response to this.

0003

[Problems to be Solved by the Invention] As described above, conventionally, a sequencer first specifies a data number using multiple bits,
After that, the start signal had to be given after a certain amount of time. Therefore, there is a problem in that the burden on the sequencer side increases. Therefore, an object of the present invention is to reduce the burden on the sequencer when performing positioning control.

0004

[Means for Solving the Problems] In order to solve such problems, the present invention stores data for positioning including the movement amount and feed speed of the servo motor in advance,
When an external device including a sequencer selects one of the data and performs positioning control, a desired one of the data can be selected by a 1-bit signal or a multiple-bit signal from the external device, and a 1-bit signal is used. When a signal is received, the corresponding data is read out and positioning control can be performed immediately.

[0005]

[Operation] By making it possible to access the memory with a 1-bit signal and having this serve also as a start signal, it is possible to reduce the burden on the sequencer as a host device.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a flowchart showing an embodiment of the present invention. Here, in order to be able to select between the conventional case of specifying the data number using multiple bits and then giving a start signal, and the case of immediately controlling using 1-bit data, a predetermined instruction is first given in step S1. That is, it is determined whether or not an instruction as to whether or not to control is given using bit data. If the result is NO (N), control is performed in the same manner as in FIG. 3 (step S5
), if yes (Y), 1-bit data is received in step S2, and in step S3, the movement amount corresponding to this data,
The feed rate is read from the memory and the servo motor 3 is driven in step S4. In this case, 1-bit data and data numbers have a one-to-one correspondence, and desired data can be read by selecting any one of the 1-bit data. In this way, the memory can be accessed using a 1-bit signal, and this signal also functions as a start signal, so that the load on the sequencer as a host device can be significantly reduced.

[0007]

[Effects of the Invention] According to the present invention, flexibility is increased because it is possible to select between conventional control and control using 1-bit data, and control using 1-bit data eliminates the need for a start signal. , the burden on the host device including the sequencer is reduced, and the design of the host device becomes easier.

[Brief explanation of drawings]

FIG. 1 is a flowchart showing an embodiment of the invention.

FIG. 2 is a schematic diagram showing a general example of a servo system.

FIG. 3 is an explanatory diagram for explaining the contents of a memory.

FIG. 4 is a flowchart for explaining the operation of FIG. 2;

[Explanation of symbols]

1 Sequencer (upper device) 2 Controller 3 Servo motor

Claims (1)

[Claims] 1. Data for positioning including the travel amount and feed speed of the servo motor are stored in advance, and when one of them is selected by an external device including a sequencer to perform positioning control, the external device A desired one of the data can be selected by a 1-bit signal or a multi-bit signal from the controller, and when a 1-bit signal is received, the corresponding data is read out and positioning control can be performed immediately. A positioning control method characterized by: