DIN rail mount temperature transmitter RMD681

Pt100Pt1000thermocouple

RMD680 8/16-channel universal input transmitter and multiplexer with serial output RS-485 • 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 • 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.