Process Image; Table 1: Process Image - WAGO 750-555 Handbuch

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WAGO-I/O-SYSTEM 750

750-555 4AO 0-20mA

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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 process data of some I/O modules or their variants in the

process image depends on the fieldbus coupler/controller used. Please take this

information from the section "Fieldbus Specific Design of the Process Data"

included in the description concerning the process image of the corresponding

fieldbus coupler/controller.

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The analog output module transmits 16-bit measured values and 8 optional status

bits per channel.

The digitalized output value is transmitted in a data word (16 bits) as output

byte 0 (low) and output byte 1 (high) via the process image of the fieldbus

coupler/controller.

This output value is represented with a 12 bit resolution on bit B3 ... B14. The

3 least significant bits (B0 ... B2) are not parsed.

For the standard module , the numerical values ranging from 0x0000 ... 0x7FFF

are scaled on the output current ranging from 4 mA to 20 mA.

Table 15: Process Image

Output current

4 mA ... 20 mA