ABB SNAT604IFS Integrated circuit module

Grounded Signal Sources: Outputs of grounded sources (sources which are not floating) must be referenced to a common ground which ensures that the input voltage will not exceed the input range (±10 V) of the board. Shields from grounded sources should be connected to the LOW terminal of the sources, and left open at the board. Unused Inputs: Unused inputs within each group of eight channels (0 through 7, 8 through 15, etc.) should be connected to a common ground to avoid interference with active channels. Grounding of unused 8-channel groups is not essential, but will assist in minimizing susceptibility to system noise.

VMEbus communication takes 

place through Control/Status, Configuration and Data registers which can be jumper located in either the A16 short I/O space, A24 standard space or A32 extended address space. A resident bus interrupter is under program control and can be configured to generate any interrupt request from IRQ1 through IRQ7. Digitized input data is accumulated in a dual port data buffer which consists of from 16 to 1,024 data words, where each data word contains the 16-bit digitized value of a single analog input channel. Data accumulates in the buffer in selectable blocks of 1, 8, 16, 32 or 64 input channels. Buffer size and block size both are under program control, and the buffer can be read at any time without affecting the scanning sequence.

Data scaling is adjustable with jumper-controlled voltage ranges.

 Channel gain is software programmable and can be fixed at x1 or x10 or can be set in the Auto Gain mode which uses the gain buffer. A data ready flag can be programmed to occur when the buffer is either full or half-full. An interrupt can be generated simultaneously with the data ready flag, or after a specific number of samples have been acquired. The analog inputs can be scanned continuously or in triggered data bursts. Bursts (single scans) can be acquired automatically at intervals up to 687 seconds, or can be triggered by an external event. Single channel random access is also supported. Various block size/buffer size combinations are available to add versatility to the board. References to programming jumpers are made throughout this section. Jumper installation requirements are described in Chapter 2 “Configuration and Installation”.

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