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8 ISOLATED ANALOG INPUTS
The Analog Input modules are supplied as either a current input module (MM8AI/I) or a voltage input module (MM8AI/V). The inputs are fully isolated from input to logic and between inputs. This module is ideal for monitoring existing 4-20mA current loops which are isolated from each other and cannot be connected to a common point of reference. The standard setting for the MM8AI/I module is 0 - 20mA input current which represents an output value of 0 - 4095 (12 bits) in the corresponding Modbus register. To obtain an output value of 0 to 4095 for an input signal of 4 to 20mA the offset switch is switched on. The same applies to the MM8AI/V module. An input voltage of 0 - 10Volts represents an output of 0 - 4095 and 2 volts would give a reading of 819 ± 1LSB. To obtain an output value of 0 to 4095 for an input signal of 2 to 10V the offset switch is switched on. An input range of 0(1) to 5Vdc is available by removing the jumper link located on the analogue board inside the enclosure.
Power Supply: Logic 10 - 26 Vdc @ 85 mA Inputs: Voltage 0(2) - 10 Vdc or 0(1) - 5 Vdc - 8AI/V Current 0(4) - 20 mA - 8AI/I Input Resistance (8AI/V) 20kohms Input Resistance (8AI/I) 250ohms Resolution 12 bits Isolation 1500Vrms between field and logic 350Vpeak between inputs Drift 100ppm/°C Accuracy 0.2% of span Connector: 11 Pin Connector on rear of unit 18 Way screw connector on front
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