JPH01138145U

JPH01138145U -

Info

Publication number: JPH01138145U
Application number: JP3507088U
Authority: JP
Priority date: 1988-03-16
Filing date: 1988-03-16
Publication date: 1989-09-21

Description

[Brief explanation of drawings]

第１図は本考案にかかる中央処理システムにお
ける自己監視回路の一実施例を示すブロツク図、
第２図は第１図に示した実施例における制御対象
機器のインタフエース回路を示すグロツク図、第
３図は第１図に示した一実施例における自己監視
のための動作を説明するために用いられたフロー
チヤート、第４図は従来の中央処理システムを示
すブロツク図、第５図は従来の他の中央処理シス
テムを示すブロツク図である。１……中央制御部、２……マイクロ中央処理装
置、３……バス、４……出力ポート、５……入力
ポート、６，１６……コネクタ、７……出力デー
タバス、８……リードライト制御信号線、９，１
０，１１……ストローブ信号線、１２……共通デ
ータバス、１３―１〜１３―３……制御対象機器
、１４―１〜１４―３……入力データバス、１５
―１〜１５―３……折り返しバス、１７，１８，
１９，２０……折り返し信号線、２１，２４，２
５……ノツト回路、２２，２３……アンド回路、
２６，２７……ラツチ回路、２８―１〜２８―８
……ナンド回路。 FIG. 1 is a block diagram showing an embodiment of a self-monitoring circuit in a central processing system according to the present invention;
FIG. 2 is a block diagram showing the interface circuit of the controlled device in the embodiment shown in FIG. 1, and FIG. 3 is for explaining the operation for self-monitoring in the embodiment shown in FIG. FIG. 4 is a block diagram showing a conventional central processing system, and FIG. 5 is a block diagram showing another conventional central processing system. 1... Central control unit, 2... Micro central processing unit, 3... Bus, 4... Output port, 5... Input port, 6, 16... Connector, 7... Output data bus, 8... Lead Light control signal line, 9,1
0, 11...Strobe signal line, 12...Common data bus, 13-1 to 13-3...Controlled equipment, 14-1 to 14-3...Input data bus, 15
-1~15-3... Return bus, 17, 18,
19, 20... Return signal line, 21, 24, 2
5...Knot circuit, 22, 23...AND circuit,
26, 27... Latch circuit, 28-1 to 28-8
...Nand circuit.

Claims

[Claims for Utility Model Registration] A signal output from a central processing unit is sent to a transmission line through an output port, and the signal is further transmitted to the controlled apparatus via the transmission line, thereby controlling the controlled apparatus. In a central processing system for controlling the transmission line, an input port for inputting a signal transmitted to the transmission line via a branch line branched from the transmission line is attached to the central processing unit, and the central processing unit controls the transmission line. A self-monitoring circuit in a central processing system, characterized in that it compares a signal sent to the central processing system with a signal inputted through the input port, and performs self-monitoring based on whether or not the two signals match.