Intro to 1756-OF8A

Intro to 1756-OF8A - MFET 474 Introduction to the 1756-OF8A...

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11/17/2009 1 MFET 474 Introduction to the 1756-OF8A ControlLogix Analog Output Module Title 1756-IF16 (analog in) 1756-OF8 (analog out) 2
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11/17/2009 2 Module Types 3 Working with analog outputs • ControlLogix output modules convert a digital value (count) that is delivered to the module via the backplane into an analog signal of -10.5 to +10.5 volts or 0 to 21 milliamps. • The digital value represents the magnitude of the desired analog signal. The module converts the digital value into an analog signal and provides this signal on the module's screw terminals. 4
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3 Working with analog outputs • The RPI rate governs exactly when an analog output module receives data from the controller and when the output module echoes data output module echoes data. • The controller sends data to an analog output module only at the period specified in the RPI. • When an analog output module receives new data from a controller, the module automatically “echoes” a data value that corresponds to the analog signal present at the output terminals. This feature, is called Output Data Echo . 5 Resolution • ControlLogix analog input modules are capable of 16 bit resolution. 2 16 = 65 536 = 65,536 • ControlLogix analog output modules are capable of 13-16 bit resolution, depending on the module type. 6
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Intro to 1756-OF8A - MFET 474 Introduction to the 1756-OF8A...

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