Process Image - WAGO 750 Series Instruction Manual

2-channel analog input module 4-20 ma, differential input

Manual (248 pages)

System manual (56 pages)

Manual (44 pages)

Table of Contents

Process Image

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Process Image

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Mapping of process data in the process image of fieldbus systems

The representation of the I/O modules' process data in the process image depends

on the fieldbus coupler/controller used. Please take this information as well as the

particular design of the respective control/status bytes from the section "Fieldbus

Specific Design of the Process Data" included in the description concerning the

process image of the fieldbus coupler/controller used.

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Evaluation of Status Byte

Some fieldbus systems can process status information of process value by means

of a status byte.

This status byte can be displayed via the commissioning tool WAGO-I/O-

CHECK.

However, processing via the fieldbus coupler/controller is optional, which means

that accessing or parsing the status information depends on the fieldbus system.

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The I/O module 750-492 transmits 16 bits of measured values and 8 status bits

(optional) per channel.

The digitalized measured value is transmitted to the process image of the

coupler/controller in a data word (16 bits) as input byte "0" (low) and input byte

"1" (high).

The digitalized value is mapped with a resolution of 13 bits to bit B2 - B14. From

production number 3203XXXX, status information, which can be evaluated in the

event of an error, is contained in the two least significant bits (B0 - B1). If the

measurement is below the measuring range or if a wire breaks, bit B0 and B1 are

set =1.

With modules with an earlier production number, these last 2 bits are not