Remote input/output unit

A technology of remote output and converter, applied in electrical components, emergency protection circuit devices for limiting overcurrent/overvoltage, instruments, etc., can solve the problem of high cost of replacement of parts

Inactive Publication Date: 2009-04-22
YOKOGAWA ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] When the fuse F1a is installed inside the remote I / O unit 1, the cost of parts replacement is high when the fuse F1a is broken. Therefore, in most cases, the fuse F1b is not installed inside the remote I / O unit 1, but is installed outside.

Method used

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Embodiment Construction

[0046] (best form for carrying out the invention)

[0047] The present invention will be described in detail below using the drawings.

[0048] figure 1 The configuration of an embodiment of the present invention is shown. Those that are the same as those in the preceding figures are marked with the same symbols.

[0049] The external power supply 2 is a 24V power supply, connected to the input terminals (P24Vin, N24Vin), and generates the power supply (5V) for the internal circuit (communication control mechanism 22, etc.) of the remote I / O unit 1 from 24V through the DC / DC converter 11.

[0050] The communication interface 13 is a serial interface such as RS-485. It is connected to the master module or other slave units with a remote network without status frames, and the data of input and output (I / O) is loaded on the network, and it is performed with a small number of wiring. data exchange.

[0051] The remote I / O unit 1 includes terminals (P24Vout, N24Vout) as extern...

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PUM

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Abstract

A remote I / O unit is capable of making a main module identifying abnormities when short failure of an external power supply is taken place therein. The invention relates to a remote I / O unit, which inputs external power, supplied power to an internal circuit through a DC / DC converter, and supplies external power to external devices without using the DC / DC converter, comprising an over-current detecting mechanism, detecting the over-current of the external power to the external devices, a switching mechanism, disconnecting the current to the external devices, a communication interface connected to remote networks without the status frame, and a communication control mechanism, controlling the communication through the communication interface, wherein the over-current detecting device disconnects the current and informs the disconnection of the current to the communication control mechanism when the over-current through the switching mechanism is detected.

Description

technical field [0001] The present invention relates to a remote input / output unit, which inputs an external power supply and supplies power to an internal circuit through a DC / DC converter, and at the same time supplies the external power to external equipment without a DC / DC converter, particularly relates to a A remote I / O unit that can recognize short-circuit abnormalities in external power supplies. Background technique [0002] Connect the master module and the slave unit (remote I / O unit) with a remote network without status frames, and load the I / O data on the network, enabling data exchange with a small number of wiring. [0003] figure 2 This shows a configuration example of a known remote I / O unit. [0004] The remote input / output unit 1 is operated by an external power supply 2 . For example, the external power supply 2 is a 24V power supply and is connected to the input terminals (P24Vin, N24Vin), and the power supply (5V) for the internal circuit (communicat...

Claims

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Application Information

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IPC IPC(8): H02H9/02G06F13/00
CPCH04Q9/04H04Q2209/88
Inventor 泽本伯明
Owner YOKOGAWA ELECTRIC CORP
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