Vega Modbus-TCP, ASCII protocol Bedienungsanleitung PDF herunterladen (Seite 7)

1 Function as Modbus-TCP server

Modbus-TCP, ASCII protocol • VEGAMET 391/624/625, VEGASCAN 693, PLICSRADIO C62

30768-EN-130701

Modicon

Temporary memory of VEGASCAN (2 words =

4 byte)

31011 PC/DCS output 3: Status

31013 PC/DCS output 4: Measured value

31015 PC/DCS output 4: Status

31017 PC/DCS output 5: Measured value

31019 PC/DCS output 5: Status

31021 PC/DCS output 6: Measured value

31023 PC/DCS output 6: Status

… …

31113 PC/DCS output 29: Measured value

31115 PC/DCS output 29: Status

31117 PC/DCS output 30: Measured value

31119 PC/DCS output 30: Status

As an alternative, register address 41001 is also available as start

address (function code 03).

The actual measured values are transmitted as signed data compris-

ing four octets. In addition to the measured value, the status of the

measured value is supplied in a second register word.

Example of the data of a PC/DCS output

Float Bit 15…0 Float Bit 31…16

High-Byte/Low-Byte High-Byte/Low-Byte

Note:

On the switching inputs of PLICSRADIO C62 (measurement loops

4 … 6) the values 0 (switch open) and 100 (switch closed) are trans-

mitted as measured values; the units are discarded.

984 Floating point: Intel single precision real. First register contains

bits 15 … 0 of 32 bit number (bits 15 … 0 of signicand). Second

23 … 16 of signicand).

The status describes the condition of the associated measured value.

The content of the measured value is only valid if the corresponding

status has the value zero. If there is a status value unequal zero, the

status value and the corresponding value in the measured value eld

must be taken into account in a detailed failure diagnosis. The follow-

ing chart explains the possible faults.

Status Measured

value

Meaning

0 XXXX Valid measured value

Format of the PC/DCS

value

Floating point of OPEN

MODBUS/TCP SPECIFI-

CATION

1 2 3 4 5 6 7 8 9 10 11 12 ... 31 32

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