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Product Name: AB 1756-IF6I
General Specifications
This mode lets you change the data representation of the selected module. Although the full range of the module does not change, you can scale your module to represent I/O data in terms specific for your application. For example, if you are using the 1756-IF6I module in floating point mode and choose an input range of 0 mA…20 mA, the module can use signals within the range of 0 mA…21 mA but you can scale the module to represent data between 4 mA…20mA as the low and high signals in engineering units
The key difference between choosing integer mode or floating point mode is that the integer is fixed between -32,768…32,767 counts and floating point mode provides scaling to represent I/O data in specific engineering units for your application. Module resolution remains constant between the formats at 0.34 μA/count.
This alarm feature detects when the isolated input module is operating beyond limits set by the input range. For example, if you are using the 1756-IF6I module in the 0…10V input range and the module voltage increases to 11V, the overrange detects this condition. The table lists the input ranges of the 1756-IF6CIS and 1756-IF6I modules and the lowest/highest signal available in each range before the module detects an underrange/overrange condition.
Non-isolated Analog Voltage/Current Input Modules (1756-IF16, 1756-IF8)
The 1756-IF16 and 1756-IF8 modules support these wiring methods: • Single-ended Wiring Method • Differential Wiring Method • High-speed Mode Differential Wiring Method After determining the wiring method you plan to use on your module, you must inform the system of that choice when you choose a Communication Format.
For example, if you set the 1756-IF16 module (with normal scaling in volts) to a rate alarm of 1.0 V/S, the rate alarm only triggers if the difference between measured input samples changes at a rate > 1.0 V/S. If the module’s RTS is 100 ms that is, sampling new input data every 100 ms) and at time 0, the module measures 5.0 volts and at time 100 ms measures 5.08 V, the rate of change is (5.08V - 5.0V) / (100 mS) = 0.8 V/S. The rate alarm does not set as the change is less than the trigger point of 1.0V/s. If the next sample taken is 4.9V, the rate of change is (4.9V…5.08V)/ (100 mS)=-1.8V/S. The absolute value of this result is > 1.0V/S, so the rate alarm sets. Absolute value is applied because rate alarm checks for the magnitude of the rate of change being beyond the trigger point, whether a positive or negative excursion.
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