Masibus 8208 - Electrical Characteristics

8-CHANNEL SCANNER-8208
REF NO: m82A/om/101 masibus
Issue NO: 08
User‟s Manual Page 9 of 42
Input Impedance: >1 Mohm for thermocouple/ mV/RTD/Volts inputs & 100
ohms for mAmp input.
Noise Rejection Ratio:
NMRR (Normal mode rejection ratio) > 40 dB (50/60 Hz) or more
CMRR (Common mode rejection ratio) > 120 dB (50/60 Hz) or more
Allowable wiring resistance for RTD: Maximum 15 ohms/wire (Conductor
resistance between three wires should be equal).
Retransmission Output:
Number of outputs: 1
Process Value, Set point, or Control output can be selected as a Retransmission
output.
Output signal: 0-20 mA, 4-20 mA, 0-5 V, 1-5 V or 0-10 V DC.
Voltage or current output can be selected through software and internal jumper
settings.
Load resistance: 500 ohms Max. Or less for current output. 3k or higher for voltage
output
Output accuracy: ±0.25% of Range
Relay Contact Outputs:
Number of outputs: 4
Output signal: Three terminals (NC, NO, and C)
Relay Contact rating: 250 V AC or 30 V DC, 2A (resistive load)
Operating/release time: <10 ms
Digital Contact Outputs:
Number of outputs: 8
Output Type: Open Collector
Output Contact rating: 24 V DC, 50mA (with inbuilt current limit protection)
Communication:
Communication Type: Half duplex/Asynchronous (RS-485)
Communication Protocol: MODBUS RTU
Baud rate, Parity and Stop bit are selectable form the key board.
All parameters are Configurable through MODBUS.
Connectable number of unit: 32
Communication error Detection: CRC Check
Display Specifications:
PV display: 4-digits, 7-segment, Red LEDs, character height of 0.56‟‟
Channel No. Display: 2-digits, 7-segment, Green LEDs, character height of 0.56‟
Relay Group Display: 1-digits, 7-segment, Red LEDs, character height of 0.56‟
Statu s i ndicatin g lamps: 16-Red LEDs for Alarms status, 4-Red LEDs for Relay
status, 1-Red LED Manual mode status, 1-Red LED Fault status, 2-Green LEDS for
Communication.
Power Supply Specifications:
Power supply: Rated AC voltage of 85 to 260V AC at 50/60 Hz ( Rated Dc voltage
100 to 300VDC) / Rated voltage of 18 to 36V DC (Optional),