3AI780.6-L B & R Automation
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The B & R Automation 3AI780.6-L is part of the System 2005 Controllers series and features 8 analog inputs with a 16-bit digital converter resolution. It uses a sigma delta conversion method, provides an input impedance of 400 Ohms, and offers a basic accuracy of ±0.05% at 25°C. Channel-to-channel voltage is rated at 600 V, with a pulse dielectric strength of 4000 V.
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Product Description:
The 3AI780.6-L is an eight-channel analog input module produced by B&R Automation for the System 2005 Controllers series. Installed on the system backplane, the module acquires process voltages and currents from field devices. It forwards digitized results to the CPU, enabling precise closed-loop control in industrial automation cells. Because it mounts directly in the controller rack, signal conversion occurs inside the automation system rather than in a separate external instrument.
The module’s front end contains a low-pass filter with a cutoff frequency of 80 Hz, so higher-frequency noise is attenuated before conversion. Each input is digitized by a Sigma-Delta converter that offers 16-bit resolution, giving fine measurement granularity across the full operating range. For additional signal cleanliness, the digital filter provides over 120 dB of rejection at the line frequency, which helps suppress interference before the data reaches the controller. At 25 °C, the basic accuracy is ±0.05 %, while the initial zero error is limited to ±0.005 %. Temperature effects are reduced by an offset drift of ±0.001 %/°C and a gain drift of ±0.007 %/°C. The module supplies up to 30 mA to an external incremental encoder, eliminating the need for a separate power feed. All eight inputs share a 400 Ω impedance, and they are protected against overvoltage up to 30 VDC. This combination helps preserve low-level sensor signals in cabinets where power wiring and analog lines run near each other.
Galvanic isolation is provided on several levels. Adjacent input channels withstand 600 Veff, and each channel can float 300 Veff above protective earth, so crossed signals do not propagate between inputs. The common-mode operating window reaches ±300 VAC/VDC, allowing differential measurement on power lines with substantial offset. Short-duration transients are absorbed by a pulse dielectric strength of 4000 V, which helps maintain controller integrity during switching events. This isolation structure allows the module to handle channels referenced to different potentials without coupling disturbances into neighboring measurements.
Frequently Asked Questions about 3AI780.6-L:
Q: What is the analog filter cutoff frequency for the 3AI780.6-L controller?
A: The 3AI780.6-L has an analog filter cutoff frequency of 80 Hz, helping minimize high-frequency noise in measured signals.
Q: What conversion method does the 3AI780.6-L use for analog signals?
A: This model uses a Sigma Delta conversion method, which supports precise analog-to-digital signal conversion.
Q: What is the resolution of the digital converter in the 3AI780.6-L?
A: The digital converter resolution on this unit is 16 bits, allowing for high-precision signal processing.
Q: What is the maximum channel-to-channel voltage for the 3AI780.6-L?
A: The channel-to-channel voltage rating is 600 Veff, ensuring safe electrical isolation between inputs.
Q: How many analog input channels does the 3AI780.6-L provide?
A: There are 8 input channels available on the 3AI780.6-L for connecting multiple analog signals.
