X20DC1976
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The B & R Automation X20DC1976 is a high-performance module part of the X20 Series, featuring an input frequency up to 250 kHz. It includes two digital inputs, operates at a nominal voltage of 24 VDC, and supports both horizontal and vertical mounting orientations. Additionally, it offers a degree of protection rated at IP20.
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Product Description:
The X20DC1976 is one of B&R Automation's digital counter modules that incorporate an ABR incremental encoder. With its compact design and lightweight construction, it is the perfect tool for monitoring the output of digital devices. Aside from its ABR incremental encoder, the X20DC1976 offers two more non-analog inputs that work best for latch inputs. The standard voltages used by this digital counter module are 5 volts, 24 volts, and GND. It also uses a NetTime timestamp for facilitating counterchange during operation. Overall, the X20DC1976 is best for push-pull encoders without a complementary signal.
The digital inputs for the X20DC1976 employ an input filter with hardware response time of less than 2 microseconds. Both digital channels use 24 VDC but allow -15% to 20% input voltage. Approximately, the input current of each channel is 3.3 mA when the terminal voltage is allowed to reach its nominal value. The channels employ 3 wires for connections and have the following switching thresholds: 5 volts DC (low threshold) and 15 volts DC (high threshold). These threshold voltages dictate at which values of the input will the module start to consider it to have changed to another state. The low threshold sets the boundary of switching from high to low, while the high threshold sets the boundary of switching from low to high.
On the other hand, the X20DC1976's ABR encoder uses a 5V asymmetrical supply with a maximum input frequency of 250 kHz. Normally, the ABR incremental encoder employs 4x evaluation and draws 300 mA from the supply. In case of short-circuit faults or overloading, the ABR incremental encoder will cease to function, assuming its protection devices work correctly.
Frequently Asked Questions about X20DC1976:
Q: What is the switching threshold voltage for the X20DC1976's incremental encoder?
A: The ABR incremental encoder has a low threshold voltage of 1 V.
Q: Are the channels in the X20DC1976 isolated?
A: The X20DC1976's channels are isolated electrically from the bus but not from one another.
Q: What is the insulation voltage between the X20DC1976's bus and encoder?
A: The X20DC1976 has an insulation voltage of 500 volts.
Q: What is the X20DC1976's digital input resistance?
A: The X20DC1976's digital input resistance is estimated to be 7.03 kilo ohms.
Q: What encoder inputs are possible for the X20DC1976?
A: The monitored encoder inputs may take any of these values: A, B, or R.
