Transducer Input Module P40; Introduction - Novatech Bitronics M87X Series Manual

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10.0 TRANSDUCER INPUT MODULE P40

The Transducer Input Module features 8 separate inputs each with two terminals, one

which provides a unique return path for each input. This permits the inputs configured as

current inputs to be series connected to multiple transducer input devices and inputs

configured as voltage inputs to be parallel connected to multiple transducer input devices.

The input terminal assignments are shown in figure 20.

The inputs are jumper-selectable for three different transducer input formats. The inputs

can be jumpered for either 0–1 mA or 4-20 mA current inputs or for 0–10V voltage inputs.

Both the 0-1 mA and 0 -10 V formats are bipolar (bi-directional) such that they span (-)1mA

to (+)1mA and (-)10V to (+)10V respectively. Each format allows for input over-range such

that inputs exceeding the normal range can still be reported accurately. The reportable

range for each input type is approximately: (+/-) 2.5 mA for 0-1mA inputs; (+/-) 12.5V for

the 0-10V inputs; and 0 to 25mA for 4-20mA inputs.

Each transducer input can be independently configured for any of the three input formats.

This permits one Transducer Input Module to be used to read eight analog inputs with any

mix of the three standard current and voltage formats. Transducer Input Modules can only

be ordered pre-configured for one standard input type (all inputs are pre-configured at the

factory for one input type), however, each input on every Transducer Input Module is

calibrated to support all format types. Changing an input's type is easy and only requires

changing that input's jumper setting. The jumper settings are documented in section

10.8.1, below.

Each transducer input is sampled by a 24-Bit delta sigma analog to digital converter,

adjusted by a factory set pre-stored gain and offset calibration constant, and then

converted to a 16-Bit integer value. The Host Processor Board updates the transducer

input values in the floating point database every 500msec by reading each input's 16-Bit

integer value and converting it to a floating point value. By default the floating point value

represents the actual current (in mA) or voltage (in volts) present at the input. The Host

Processor can be configured (via the Mx70 Series Configurator software) to independently

scale each transducer input's floating point value.

The scaling is accomplished by

assigning a floating point value to the extreme values of the transducer input's format.

Input scaling is described in detail in section 10.8.2, below.

Consult the appropriate Protocol manual for information on reading the transducer inputs

and the available calculation types.

131

ML0021

August 15, 2018

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