{"product_id":"yokogawa-cp334d-processor-module","title":"Yokogawa CP334D Processor Module","description":"\u003cp\u003eThe Yokogawa CP334D is a processor module used in Yokogawa CENTUM distributed control systems. It executes control operations within the Field Control Station (FCS), processing configured control logic and coordinating the operation of associated control hardware. The CP334D is identified as a 12 MB RAM processor variant, distinguishing it from the CP333D processor module listed in CENTUM CS3000 training documentation.\u003c\/p\u003e\n\u003ch3\u003eFunction in the CENTUM Control System\u003c\/h3\u003e\n\u003cp\u003eThe CP334D operates as the processing unit of a Field Control Unit (FCU) in the Large Field Control Station (LFCS) configuration. It performs control operations using the configured process data and control programs, coordinating communication with the station's I\/O and control bus interfaces.\u003c\/p\u003e\n\u003cp\u003eIn a distributed control architecture, the processor executes control functions locally at the FCS level. Field input data is made available to the processor for control calculations, while resulting output data is transferred through the relevant I\/O interfaces.\u003c\/p\u003e\n\u003ch3\u003eMemory and Processor Status\u003c\/h3\u003e\n\u003cp\u003eThe CENTUM CS3000 training documentation identifies two processor card variants:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eCP333D: 16 MB RAM.\u003c\/li\u003e\n\u003cli\u003eCP334D: 12 MB RAM.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThis memory distinction is useful when identifying replacement hardware and checking the installed processor configuration. The two models should not be treated as identical memory configurations.\u003c\/p\u003e\n\u003ch3\u003eStatus Indicators and Diagnostics\u003c\/h3\u003e\n\u003cp\u003eThe processor card includes four status indicators or controls documented for the LFCS configuration:\u003c\/p\u003e\n\u003cfigure\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eIndicator\u003c\/th\u003e\n\u003cth\u003eFunction\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eHRDY\u003c\/td\u003e\n\u003ctd\u003eIndicates whether processor hardware diagnostics are normal.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRDY\u003c\/td\u003e\n\u003ctd\u003eIndicates normal hardware and software operation.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCTRL\u003c\/td\u003e\n\u003ctd\u003eIdentifies the control-side processor in a duplex configuration.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCOPY\u003c\/td\u003e\n\u003ctd\u003eIndicates program-copy activity between processor cards.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003cp\u003eThe card also includes a START\/STOP maintenance switch for stopping or restarting the processor CPU. CN1 is identified as a maintenance connector.\u003c\/p\u003e\n\u003ch3\u003eDuplex Processor Configuration\u003c\/h3\u003e\n\u003cp\u003eIn a duplex LFCS configuration, two processor cards operate in a synchronous hot-standby arrangement. The processors perform the same control computations, and their results are compared. If an abnormal processor condition is detected, the standby processor can take over the control function.\u003c\/p\u003e\n\u003cp\u003eThe COPY indicator provides information about program synchronization between the control-side and standby-side processor cards. This function belongs to the configured duplex system rather than representing an independent redundancy feature of a single CP334D module.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: What is the memory capacity of the Yokogawa CP334D?\u003c\/p\u003e\n\u003cp\u003eA: The CP334D has 12 MB RAM, according to the CENTUM CS3000 training documentation. The CP333D is a separate variant with 16 MB RAM.\u003c\/p\u003e\n\u003cp\u003eQ: What does the CTRL indicator show?\u003c\/p\u003e\n\u003cp\u003eA: In a duplex LFCS, CTRL identifies whether the processor card is on the control side or waiting side. In a single LFCS configuration, the indicator remains on.\u003c\/p\u003e\n\u003cp\u003eQ: Does the CP334D support hot-standby operation?\u003c\/p\u003e\n\u003cp\u003eA: Yes, it is documented for use in a synchronous hot-standby LFCS configuration with two processor cards. This requires the corresponding duplex system configuration.\u003c\/p\u003e","brand":"Yokogawa","offers":[{"title":"Default Title","offer_id":69286380503282,"sku":"CP334D","price":235.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0730\/5589\/5794\/files\/CP334D2.jpg?v=1794382027","url":"https:\/\/www.petrospare.com\/products\/yokogawa-cp334d-processor-module","provider":"Petro Spare Industrial Limited","version":"1.0","type":"link"}