Campbell Scientific CR6 CR6 Measurement and Control System - Page 75
Switched Voltage Output - Overview, 2.2.2 Voltage and Current Excitation - Overview
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Section 5. System Overview 5.2.2.1 Switched Voltage Output - Overview Reading List: • Switched Voltage Output - Specifications (p. 97) • Switched Voltage Output - Overview (p. 97) • Switched Voltage Output - Details (p. 107) U and C terminals are selectable as binary inputs, control outputs, or communication ports. See the section Measurement - Overview (p. 56) for a summary of measurement functions. Other functions include device-driven interrupts, asynchronous communications and SDI-12 communications. Table CR6 Terminal Definitions (p. 73) summarizes available options. Figure Control and Monitoring with U or C Terminals (p. 75) illustrates a simple application wherein a C terminal configured for digital input and another configured for control output are used to control a device (turn it on or off) and monitor the state of the device (whether the device is on or off). Figure 29. Control and Monitoring with U or C Terminals Image not yet available 5.2.2.2 Voltage and Current Excitation - Overview Reading List: • Voltage and Current Excitation - Specifications (p. 93) • Voltage and Current Excitation - Overview (p. 75) The CR6 has several terminals, or terminal configurations, designed to supply switched voltage to peripherals, sensors, or control devices: • Voltage Excitation (switched-analog output) - U terminals, configured for excitation output, supply precise voltage in the range of ±2500 mV. These terminals are regularly used with resistive-bridge measurements. Each terminal will source up to ±25 mA. • Current Excitation (switched-analog output) - U terminals, configured for excitation output, supply precise current in the range of ±2.0 mA. These terminals are regularly used with resistive-bridge measurements. • Digital I/O - U and C terminals configured for on / off and PWM (pulse width modulation) or PDM (pulse duration modulation) . • Switched 12 Vdc - SW12 terminals. Primary battery voltage under program control to switch external devices (such as humidity sensors) requiring nominal 12 Vdc. SW12 terminals can source up to 1600 mA. See the table Current Source and Sink Limits (p. 108). • Continuous Analog Output - available by adding a peripheral analog output device available from Campbell Scientific. Refer to section Analog-Output Modules (p. 370) for information on available expansion modules. • • Current Excitation - U terminals configured for current excitation.three switched terminals (IX1, IX2, IX3) with return connecting to IXR terminal. Capable of driving between -2500 µA and 2500 µA. 75