OUTPUT MODULE FOR INDUSTRIAL CONTROL DEVICE

• Main Author: MORISHITA TAKESHI
• Format: Patent
• Language: English; Japanese
• Published: 25.11.2021
• Subjects: CONTROL OR REGULATING SYSTEMS IN GENERAL; CONTROLLING; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS ORELEMENTS; PHYSICS; REGULATING

To prevent power from being supplied to a load during diagnosis of an output circuit.SOLUTION: The output module 3 of a PLC 1 includes: an output circuit 5 that opens/closes between a power supply terminal P1 to which a power supply voltage Va is supplied and an output terminal P2 that is connected to a solenoid 4; and a control unit 6 that controls an operation of the output circuit 5. The output circuit 5 includes: switches SWH, SWL connected in series between the power supply terminal P1 and the output terminal P2; and a current output unit 7 capable of performing an operation of short-circuiting the terminals of the switch SWH and causing a limited current equal to or less than a predetermined off-current to flow through a short-circuited path. The control unit 6 includes: opening/closing control units 13, 16 that control ON/OFF of the switches SWH, SWL; an operation control unit 14 that controls an operation of the current output unit 7; and diagnostic units 15, 17 that respectively diagnose short-circuit failures of the switches SWH, SWL based on the diagnostic signals Sd, Se that are respective signals of the low-potential-side terminals of the switches SWH, SWL.SELECTED DRAWING: Figure 1 【課題】出力回路の診断の際に負荷に対して動力が供給されることを防止する。【解決手段】ＰＬＣ１の出力モジュール３は、電源電圧Ｖａが与えられる電源端子Ｐ１とソレノイド４に接続される出力端子Ｐ２との間を開閉する出力回路５と、出力回路５の動作を制御する制御部６とを備える。出力回路５は、電源端子Ｐ１および出力端子Ｐ２の間に直列接続されたスイッチＳＷＨ、ＳＷＬと、スイッチＳＷＨの端子間を短絡し且つ短絡した経路を通じて予め規定されたオフ電流以下の制限電流を流す動作を実行可能な電流出力部７とを備える。制御部６は、スイッチＳＷＨ、ＳＷＬのオンオフを制御する開閉制御部１３、１６と、電流出力部７の動作を制御する動作制御部１４と、スイッチＳＷＨ、ＳＷＬの低電位側端子の信号である診断信号Ｓｄ、Ｓｅに基づいてスイッチＳＷＨ、ＳＷＬの短絡故障を診断する診断部１５、１７とを備える。【選択図】図１