MicroBrick I/O - Industrial Control Links

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MicroBrick Distributed I/O ModulesIn addition to viewing Analog Inputs or forcing I/O, the operator interface may also beused to configure the input mode of individual analog inputs to: “RAW” (non calibratedA/D reading) Voltage or Current.Analog I/O Module Analog Output SectionThe Analog I/O Analog Output section operates control devices such as variable speeddrives and positioners as well as display and operator interface devices such as panelmeters and chart recorders.Signal Types and LevelsThe Analog I/O Analog Output section has 8 4 to 20mA analog outputs. Each outputis individually isolated and powered by the loop that it controls. With factorycalibration, the Host system controls each output by setting the output channel’sregister to a value between 4000 (4mA) and 20,000 (20mA). The analog outputs reducethe available loop voltage (compliance) by about 5V.Isolation and Output ProtectionTo help avoid ground loop effects, the MicroBrick Analog Outputs are optically isolated,between the field connections and the internal logic, and from analog output channelto analog output channel. The outputs are also transient and surge protected by acombination of self-resetting polymer fuses and “Transorb” transient limiters. Loopvoltages or transients that might exceed the modules ratings will cause the transientprotection circuitry to start limiting the output signal. Greater overloads will cause thepolymer fuses to increase in resistance protecting the internal output circuitry. Duringa full overload condition, the outputs will conduct some current, but that current isheld at a safe level. When the fault is cleared, the output is restored back to normaloperation automatically.CalibrationThe calibration of the Analog Output section is software controlled. Calibration tablesfor the analog outputs are stored in nonvolatile EEROM memory and calibration isperformed by software techniques without opening the I/O module enclosure. If youwant to do your own calibration, contact ICL technical support for the recommendedfield calibration procedures and software.Field WiringThe Analog Inputs require an active signal source. 20mA current loop devices musteither have their own internal loop power supplies, or an external supply must beused. The Analog Inputs are isolated, so that power source for the loop devices can bethe MicroBricks power supply without causing a ground loop. Voltage type sensors aretypically self-powered. The user should ensure that self-powered devices are isolatedto avoid ground loops through individual sensors.The Analog output connections are on a 16-position removable terminal block. Thereare 8 pairs of output connections, one pair per output channel. The outputs are notpolarity sensitive. Being isolated and polarity insensitive means that the outputs maybe inserted into any point in the control loop.68Copyright © 2007 Industrial Control Links, Inc. All Right Reserved
MicroBrick Distributed I/O ModulesLoop power can come from the Controllerpower supply or any other DC source.AO connections are polarity insensitive.- -12 / 24 v+4-20mA AnalogDevice+- +4-20mA AnalogInput+12 / 24 v1A1B2A2B3A3B4A4B5A5B6A6B7A7B8A8B-Analog Input/Output MicroBrick1 2 3 4 5 6 7 8 C CLoop power can come from theController power supply or anyother DC source+ -0-5Vdc Sensor(self powered)+ -4-20mA Sensor(self powered)- + +4-20mA Sensor(loop powered)12 / 24 v-Loop power can come from the Controller power supply or any other DC sourceAnalog I/O Microbrick - Field Wiring ExampleCopyright © 2007 Industrial Control Links, Inc. All Right Reserved69
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MicroBrick I/O - Industrial Control Links

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