EDAS CE Analog Input Module

The EDAS-2003M Analog Input Module can read voltage or current inputs. Voltage or current readings can be configured on a channel by channel basis allowing one analog input module to read a combination of voltage or current inputs.

The Analog input module can be used to make a single reading, capture a waveform, or continuously stream data over Ethernet.

The EDAS-2003M-1 can capture waveforms and stream at 2 kHz.

The EDAS-2003M-2 has additional hardware to perform waveform capture and streaming at up to 200 kHz.

The EDAS-2003M-3 is also capable of performing waveform capture and streaming at up to 200 kHz. In addition, the -3 module can be used for reading thermocouple inputs. Thermocouple types J, K, T are supported, and when used, require that channel 0 be reserved for CJC compensation. The maximum number of thermocouple inputs possible is 7.

The analog input platform consists of a 16 channel multiplexer (MUX), followed by a programmable gain amplifier (PGA), feeding a 12-bit analog to digital converter (ADC). The output of the ADC is isolated and presented to the system bus. The MUX is capable of providing 16 single-ended inputs, 8 differential inputs or a mixed combination to the PGA. The PGA has gains of 1, 10, and 100. The ADC supports 0-10 V and ±10 V ranges.

The Analog Input Module has sixteen 487-ohm resistors that may be switched between the individual input channels and ground allowing the unit to take current measurements in the 0-20 mA range.

Additionally the module has 100k ohm input ground return resistors that may be switched on to provide an input bias current path for the PGA.

Hardware / Software Pacing

The Analog Input Module includes provisions for pacing (starting) conversions by software or by one of two hardware-based conversion pacing sources. These two hardware sources are an internal 24-bit Rate Generator or a digital input (EXT INT) from an I/O terminal. The EXT INT input may also be used as a trigger signal to control when conversions are started and stopped. This allows for the support of Stop on Trigger, Stop on delay after Trigger, Start on Trigger, and N Conversions after Trigger modes.

Channel Scanner

The Analog Input Module has a hardware channel scanner that scans channels 0 through N. The scanner increments the channel by one each time a conversion is started and wraps back to channel 0. The value of N is set by software.

Rate Generator

The Analog Input Module provides a 24-bit rate generator to pace (start) conversions. The base clock for this rate generator is 4 MHz providing a resolution of 250 nsec. This allows the rate generator to be set to an output range of 2 MHz to 0.238 Hz (4.2 s). The Rate Generator output is also available on the RGOUT terminal on the I/O connector.

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