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FM 450-1 Pulsing communication

Created by: Faadil at: 6/12/2008 4:15 PM (2 Replies)

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6/12/2008 4:15 PM	Rate (0)
Faadil Posts: 8 Rating: (0)	Hello, Regarding the Frequency counter module FM 450-1 there are some point which are unclear for me, please could someone assist me with the following points: Which physical layer can be used for this module (RS485?) Which ports is normal to use for reading frequency signals (e.g. 0 Hz = 0 m3/h, 5000 Hz = 2400 m3/h) According to the manual, pin 28 is for 24V encoder supply, is this the pin used to supply 24V to e.g. a flowmeter? If my input sigal is 7500 puls per m3/h, which port are you recommending to use (24 V puls encoder with or without direction level) Are there more documentation of the function blocks FC0 (CNT_CTRL) and FC1 (DIAG_INF) If you feel that these questions are silly, please remember that I have little experience with working with Simatic and Automation systems. I hope you guys can assist me with these questions, and maybe more in the future. Thank you in advance Regards Faadil
Faadil Posts: 8 Rating: (0)
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6/20/2008 7:44 PM	Rate (0)
miami Platinum Member Joined: 8/31/2005 Last visit: 11/13/2024 Posts: 2198 Rating: (328)	Hello! The FM350/450 is a module designed to read in pulses. Typically the are from a incremental encoder. On each turn this encoders send a fixed number of pulses. e.g. 1024 pulses per turn. There are encoders with one pulse track and a digital signal telling the direction or (more common) two puls track (with 90° shift). The decoder (e.g. FM450) can count the pulses and calculate the position, the speed and the turning direction of the encoder. In your case it's not the speed of a drive, but a flow. The rest is the same. All the physics you can find here (select technical data) You may use 5V (RS422) or -+15 to -+30V Pulse signals. The encoder supply can be used to supply power to the sensor, if you flowmeter can work with max 300mA it will work. Ifyourflowmeter does not meter the direction of the flow, you can use a single puls signal (without direction information, like a "one track encoder" ). For the FM450 the flow you have to meter is like a speed of a drive that has to be metered. 7500 pulses /h --> nominal flow, 1500 pulses/h --> 200% flow (I think you will have to enter the paremeters in pulse /s so it's 2,08 puls /s --> 100% flow)

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8/4/2008 12:33 PM	Rate (0)
Faadil Posts: 8 Rating: (0)	Thank you for your kind respons Regards Faadil
Faadil Posts: 8 Rating: (0)
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