Recent content by Chris T

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  1. C

    DOH!, I've lost the default password. Any clues (HC-Y810 Digital Pressure switch)

    In this video: it appears that 132 was used.
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    Two wire instruments powered using two pair cable

    It sounds like this installation resulted in the positive and negative wires not being twisted together, making them more susceptible to common-mode noise.
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    Commuincating with Laser Caliper (Laser Online LST-25 JIB)

    Looks like this has come up before: https://m.control.com/thread/1552329380
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    Radar Level Dielectric Constant

    Some radar transmitters have a general media dielectric parameter that affects the transmitter's sensitivity (e.g., lower dielectric results in higher sensitivity so that the transmitter can detect smaller signals). There may also be a separate parameter for the dielectric of the upper...
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    Troubleshouting Foundation Fieldbus

    Does the model number of your device include "PA"? If so, you likely have a Profibus model, which will not communicate on an FF network.
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    Differentiation Between Profibus Class 1 and Class 2 Master

    There's a good description here: https://www.automation.com/library/articles-white-papers/fieldbus-serial-bus-io-networks/introduction-to-profibus-dp
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    Magnetrol E3

    "SecFltLo" indicates that the readings from the LVDT are lower than expected. If the E3 (and its displacer) is intended to measure Interface level, an empty chamber could result in "SecFltLo" indication. Otherwise, there could be something wrong with the range spring, displacer, or...
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    Modbus RTU Help

    According to the Modbus specification, up to 247 slaves can exist in a network. However, that's a logical limit, there are electrical considerations. The specification also states, "A figure of 32 devices is always authorized on any RS485-MODBUS system without repeater." The actual number...
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    Magnetrol E3

    The message indicates that the position of the stem is too high, as sensed by the transmitter's electronics. The stem is connected to a range spring which applies force upwards and the displacer which pulls down due to its weight, counteracting the spring. If the displacer were to become...
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    4-20mA to 10-24VDC Foundation Fieldbus Converter

    Two that I am aware of: http://www.smar.com/en/product/if302-if302-triple-channel-current-to-foundationtm-fieldbus-converter http://www.microcyber.cn/fieldbusconverter/191.html
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    Flow Transmitter Calibration (Micro Motion EMERSON)

    Because this is a Foundation fieldbus device, you likely need to change the Output scaling in the AI block that you are using. According to the manual, "You can change the output scale only with a fieldbus host". Are you sure that your DCS does not provide access to transmitter AI blocks?
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    Motor Selection Help

    I would use a "gearhead" motor for an experiment like you describe. You may want something with adequate power, but not enough to be dangerous... For example: http://www.mpja.com/12VDC-30-RPM-Gearhead-Motor/productinfo/32204+MD/
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    Virus infection via Modbus

    For a control system to be infected via Modbus, the system would have to have features such that the control program or related software can be changed using Modbus registers. I would be surprised if there are control systems that are programmable in a significant way via a Modbus interface...
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    Fieldbus (H1) to RS232 Converter

    Softing has a Modbus to Foundation Fieldbus gateway [e.g., FIM-110 FF] that provides an RS-232 interface.
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    Hover Training Sensor

    Interesting challenge! Due to the narrow width tolerance for your application, consider a laser rangefinder. Possibly something like that shown here: https://www.parallax.com/product/28043 could work.
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