{"product_id":"yokogawa-nfaf135-s50-frequency-input-module","title":"Yokogawa NFAF135-S50 Frequency Input Module","description":"\u003cp\u003eThe Yokogawa NFAF135-S50 is identified as a frequency input module for industrial control system applications. It is intended for frequency-signal acquisition, where input signals are processed for use by the control system. The exact input range, channel configuration, signal characteristics, and hardware compatibility should be confirmed against the applicable NFAF135-S50 documentation before selecting a replacement or configuring a system.\u003c\/p\u003e\n\u003ch3\u003eFrequency Measurement and Signal Processing\u003c\/h3\u003e\n\u003cp\u003eThe module measures the time intervals between incoming pulses and calculates their corresponding frequency. Its measurement circuit uses pulse-edge detection and interval timing, while the internal processor performs the frequency calculation. This allows the controller to obtain frequency or rotational-speed process values rather than simply counting input pulses.\u003c\/p\u003e\n\u003ch3\u003eInput Channels and Signal Types\u003c\/h3\u003e\n\u003cp\u003eThe NFAF135 provides eight individually isolated input channels. It accepts the following signal types:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eDry-contact pulse input using an open-collector contact.\u003c\/li\u003e\n\u003cli\u003eDry-contact pulse input using a relay contact.\u003c\/li\u003e\n\u003cli\u003eVoltage pulse input using a rectangular waveform.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe input mode determines the terminal connections and associated configuration settings. For open-collector contact inputs, the maximum input frequency is limited to 800 Hz; the general 10 kHz rating should not be applied indiscriminately to every input mode.\u003c\/p\u003e\n\u003ch3\u003eMeasurement Performance\u003c\/h3\u003e\n\u003cp\u003eThe module covers an input frequency range of 0.1 Hz to 10 kHz, with a frequency accuracy of 0.1% of reading and a 10 ms data update cycle. The wide measurement range supports both low-speed rotational monitoring and higher-frequency pulse measurements.\u003c\/p\u003e\n\u003ch3\u003eParameter Table\u003c\/h3\u003e\n\u003cfigure\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eNFAF135-S50\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eYokogawa\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eFrequency Input Module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNumber of Input Channels\u003c\/td\u003e\n\u003ctd\u003e8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChannel Isolation\u003c\/td\u003e\n\u003ctd\u003eIndividually isolated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Signal Types\u003c\/td\u003e\n\u003ctd\u003eDry-contact pulse, voltage pulse\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Frequency Range\u003c\/td\u003e\n\u003ctd\u003e0.1 Hz to 10 kHz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Frequency - Open-Collector Input\u003c\/td\u003e\n\u003ctd\u003e800 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFrequency Accuracy\u003c\/td\u003e\n\u003ctd\u003e0.1% of reading\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eData Update Cycle\u003c\/td\u003e\n\u003ctd\u003e10 ms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMinimum Input Pulse Width\u003c\/td\u003e\n\u003ctd\u003e40 us\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage Pulse Swing\u003c\/td\u003e\n\u003ctd\u003e3 V or more\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage Pulse High Level\u003c\/td\u003e\n\u003ctd\u003e3 to 24 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage Pulse Low Level\u003c\/td\u003e\n\u003ctd\u003e-1 to 8 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSignal Source Resistance\u003c\/td\u003e\n\u003ctd\u003e1 kOhm or less\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eContact Input Open Resistance\u003c\/td\u003e\n\u003ctd\u003e100 kOhm or more\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eContact Input Closed Resistance\u003c\/td\u003e\n\u003ctd\u003e200 Ohm or less\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmitter Power Supply\u003c\/td\u003e\n\u003ctd\u003eSelectable 12 VDC \/ 24 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWithstanding Voltage\u003c\/td\u003e\n\u003ctd\u003e500 VAC for 1 minute, input-to-system and channel-to-channel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eConfiguration and Connection Requirements\u003c\/h3\u003e\n\u003cp\u003eThree input modes are documented, and each requires the corresponding terminal arrangement and configuration:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eOpen-collector contact: Uses INB-INC connections. The transmitter supply and shunt-resistance settings must match the field circuit.\u003c\/li\u003e\n\u003cli\u003eRelay contact: Uses INA-INB connections. This mode has a different transmitter-supply and resistance configuration from the open-collector mode.\u003c\/li\u003e\n\u003cli\u003eVoltage pulse: Uses INB-INC connections and requires the input voltage levels to remain within the specified signal limits.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe module's transmitter supply and input-mode settings are configured through the STARDOM Resource Configurator. The available 12 VDC or 24 VDC supply selection should be checked against the connected sensor's electrical requirements.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: Can the NFAF135-S50 accept both contact pulses and voltage pulses?\u003c\/p\u003e\n\u003cp\u003eA: Yes. It supports open-collector contact pulses, relay contact pulses, and rectangular voltage pulses. The selected input mode determines the wiring and configuration requirements.\u003c\/p\u003e\n\u003cp\u003eQ: Can all eight channels measure frequencies up to 10 kHz?\u003c\/p\u003e\n\u003cp\u003eA: The general input frequency range is 0.1 Hz to 10 kHz. However, open-collector contact input is limited to 800 Hz, so the actual operating range depends on the selected input mode.\u003c\/p\u003e\n\u003cp\u003eQ: What should be checked when replacing an existing NFAF135 module?\u003c\/p\u003e\n\u003cp\u003eA: Verify the complete ordering code, input signal type, channel wiring, transmitter supply setting, and controller\/base-module compatibility. The model designation alone is insufficient to establish that every configuration is interchangeable.\u003c\/p\u003e\n\u003ch3\u003eOrdering Code and Configuration Notes\u003c\/h3\u003e\n\u003cp\u003eYokogawa's product selection documentation lists NFAF135 configurations with the S50 specification code, followed by additional option codes such as 13S00, 13S10, and CCC01. Therefore, NFAF135-S50 may not represent the complete ordering code. Confirm the remaining suffix and connector configuration against the equipment nameplate before ordering. \u003c\/p\u003e","brand":"Yokogawa","offers":[{"title":"Default Title","offer_id":68834678669554,"sku":"NFAF135-S50","price":235.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0730\/5589\/5794\/files\/NFAF135-S502.jpg?v=1793930486","url":"https:\/\/www.petrospare.com\/products\/yokogawa-nfaf135-s50-frequency-input-module","provider":"Petro Spare Industrial Limited","version":"1.0","type":"link"}