RMD680 - 2 Pages

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RMD680

Catalog excerpts

www.nokeval.com    FI-37100 Nokia, Finland    Fax. +358-3-3422066 Process inputs: 0/4..20mA, -20..+20mA, 0..10V, -10..+10V mV input range: -100..+100mV Thermocouples: B,C,D,E,G,J,K,L,N,R,S,T    J RTD sensors: Pt100, Pt1000, Ni, Cu, KTY83 Resistance input range: 0..40000 ohm 1 analog output 0/4..20 mA or 0..10V, channel selection with digital inputs or min/max value 2 alarm relays, with common alarms Display on front panel Programming with front panel keys or with serial interface RS-485 Modbus RTU and Nokeval SCL serial protocols Power supply 24 VDC, galvanically isolated from inputs Multichannel transmitter RMD680 has been designed for applications where lots of inputs have to be measured and transferred economically either to PC or PLC. Transmitter has 16 input channels, which can be programmed individually for different sensors. Measurement rate is 12 channels per second. Measurements can be read either by serial interface RS-485 using Modbus RTU or Nokeval SCL protocol or with one analog output. Up to 32 devices can be connected to the same serial bus without repeaters. It takes 30ms to read all channels from one device, thus 512 channels can be read in less than second. When analog output is used, output channel is selected with a 4-bit digital input. Transmitter has also 4-bit digital input for enabling its analog output thus total channel count can be increased to a maximum of 256 channels by connecting mA outputs of several devices in parallel. This way all channels from one device can be read in less than one second. Every channel can be configured totally individually. Channel inputs are differential thus channels don’t affect on each other. Transmitter has two alarm relays, that can work as common alarms: if any channel passes alarm limit, the relay activates. Device can be configured either with front panel keys or with serial interface using Mekuwin configuration software. Transmitter is compatible with WinX and PromoLog data-acquisition software and any third party software with Modbus communication. Modbus RTU or Noke val SCL protocol Digital inputs for selecting channel for analog output 16 channels    16 channels 16 channels    16 channels &    -CL WinX or PromoLog Getting measurements from transmitters using serial communication is simple using either Nokeval SCL protocol or Modbus RTU, which is the only totally open de facto solution for industry. Multiplexing channels is an economical way to get measurement data for systems where it is not possible to get more analog inputs or serial communication. mA-outputs can be connected in parallel and only one device at a time is active. Active device/channel is selected by digital inputs. 1 analog output from any of the 256 channels (16 channels x 16 devices = 256 channels).

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RTD sensors: Sensors    Pt100, Pt1000 or Ptxxx (xxx = selectable) Measurement current    0,25 mA, multiplexed Sensor error correction Adjustable for each channel Serial interface: Connection Protocols Baud rate Bits Reaction time 16 channel read Maximum range Sensors Range Accuracy Sensors Range Sensor Range Ni100 or Nixx (xx = selectable) -60..+180°C 0.05% of reading + 0.25°C Cu10 or Cuxx (xx = selectable) -200..+260°C KTY83 -55..+175°C Alarms: 2 alarm relays, max 250VAC, 2A resistive General alarms selectable Thermocouples: Sensor Digital inputs: Analog output: Accuracy mA output...

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