Analog Input Modules - Motorola V186 - Cell Phone - GSM System Planner Manual

Analog Input Modules

The Analog Input (AI) modules have 8 or 16 inputs. The modules sample and convert
analog data into digital format and transfer the digital data to the CPU module.
The following modules are available:
8 AI, ±20 mA (supports 4-20 mA)
16 AI, ±20 mA (supports 4-20 mA)
8 AI, ±5 V (supports 0-5 V and 1-5 V)
16 AI, ±5 V (supports 0-5 V and 1-5 V)
The module's analog-to-digital conversion resolution is 16 bit (including sign). Each
input is fully isolated from the other inputs on the module and also optically isolated from
the module internal circuits. The modules are fully calibrated and can be tested and
recalibrated in the field.
The measured values are digitally filtered to reduce 50 or 60 Hz noise. The user can
select the filtering frequency per module. The measured values can be smoothed by
digital filtering.
Smoothing is accomplished by calculating the running average values of a defined
number of converted analog values (samples). The user can select the level of smoothing
per module. The higher the smoothing level chosen, the more stable the smoothed analog
value and the longer it takes until the smoothed analog signal is applied after a step
response.
The user can select how the analog values are represented to the user application
program, as unit-less numeric values or as scaled values that represent certain
Engineering Units (EGU).
Each AI module can include an optional plug-in floating 24V DC power supply to power
external devices.
Each analog input has two status LEDs:
UF - indicates Underflow when lit
OF - indicates Overflow when lit
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