ABB MSR04X1 Displacement drive module

Applications with Signal Conditioning Boards The VMIVME-3122 serves as a multiplexer/digitizer for signal conditioning boards such as the VMIVME-3413 32-Channel Low-Level Input Board. The output connectors on the signal conditioning boards are configured to cable directly to either P3 or P4 on the VMIVME-3122. When used with signal conditioning boards, the VMIVME-3122 is configured with differential inputs. These applications use either the 500 Hz input filter option, or no filters at all.

Operation with Direct Analog Inputs 

When used without signal conditioning input boards, the VMIVME-3122 provides direct full scale input ranges from ±250 mV to ±10 V. The optimum input filter for these applications is the 50 Hz filter, although the 10 Hz filter will provide improved attenuation of power line frequency interference at the expense of decreased common-mode rejection. To minimize the effects of direct input multiplexing, the inputs on the VMIVME-3122 are buffered using op-amps. The buffers supply a constant low impedance to the Programmable Gain Amplifier (PGA) regardless of the varying source impedance. Use the lowest input gain and the largest block size (refer to Chapter 3 “Programming”) that are practical for the application. If inputs are obtained directly from remote sources, the grounding scheme used can have a major effect on system performance. Each system has its own unique interference considerations, but the following general guidelines will apply in most cases.

Long Input Lines

Long input lines (greater than 10 feet), or inputs from grounded sources (sources which are not floating), should be connected to differential inputs, and overall shields should be extended from the input sources to as close to the board as possible. Single-ended inputs are susceptible to ground loop errors, and should be used only with high-level floating sources. Source Impedance: Use signal sources with the lowest available source impedances. Susceptibility to crosstalk and induced interference increases as the source impedance increases. 

Floating Signal Sources: The shield from a floating signal source (RTD, strain gage, etc.) should be connected to the LOW (negative) terminal at the source. For low impedance sources (less than 10 ), or for sources which are protected from interference fields, connect the board end of the shield to analog return (AGND) at the board. For high impedance sources, connect all shield terminals of the sources together, and leave the board ends of the shields open.

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