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VIBRO MPC4 200-510-076-114 mechanical module

Input Over Voltage Protection All analog inputs, regardless of mode and analog references (AREF1 and AREF2), are protected from over-voltages (these ranges are shown on page 37). Current Measurement Considerations Precision resistors external to the module are required to convert currents to voltages that can be measured directly by the module. The resistors can be mounted on field marshaling terminals or are provided using the appropriate analog input termination blocks. For differential current measurements, both sides of the external resistor are brought onto the module. It is possible to mix current and voltage measurements on the same module as long as they can work with the same voltage range selected. In the case of single-ended measurements, this either requires that both current and voltage measurements are referenced to the same reference point (AREF1 or AREF2), or that voltage inputs be on one set of eight inputs and current inputs on the other set. Input Range and Mode Selection Jumpers The jumpers that determine the mode and input range for the module are set at manufacturing time for an input range of 1 to 5 volts and the 16-channel, single-ended input mode. If other input ranges or another mode is desired these jumpers must be repositioned to the appropriate settings. There are 17 jumper locations that are used. They are summarized in Tables 2 and 3, below. The module’s cover must be removed to access and reposition the jumpers.

Sampling Speed 

The rate at which each of the analog input channels is sampled depends upon the mode of operation. Each channel is given a 225 msec time slot during the multiplexing process. During that time slot, the input voltage is connected to the measuring system, the measuring system is allowed to settle, the settled value is sampled (and held), and is then converted to a 12-bit value by an analog-to-digital converter. The channels are sampled in numerical order. In single-ended mode, the 16 channels are sampled in 3.60 msec on a continuous repeating basis. In differential mode, the eight channel pairs are sampled in 1.80 msec on a continuous repeating basis. Converted data are stored in the module’s RAM and can be accessed by the controller. Data for a given channel is available at the previously stored value until an updated conversion replaces it. Sampling speed is unrelated to internal access speed within the Regent system. Programming and other features determine how often the Regent system can access the converted data. There are no “lockout times” when the Regent system is prevented from reading the current stored values of the converted data.