CARLO GAVAZZI WM4-96 - PROGRAMMING Manual de usuario descargar pdf (Pagina 40)

CARLO GAVAZZI

CONTROLS

SERIAL COMMUNICATION PROTOCOL

WM4-96

V1 R3

Page

3.4.2 Event reading

Example 24: read command of the event stored at address 2240h

The reading of the information regarding an event is carried out by transferring 4 words starting from

the first address of the selected event location, according to the Event Logging Map table (see

paragraph 3.2).

The description of the event is obtained by decoding the data contained in the 4 words, according to

“n

event coding” table.

In accordance to the above listed procedure, before reading a MAX or MIN event, the variable

associated to the MAX or MIN must be known. Then the info of the variable (decimal point position)

must be acquired. Finally the stored value must be read.

4-word read command frame (8 byte):

01h

04h

22h

40h

00h

04h

FAh

65h

read command answer frame (13 byte):

01h

04h

08h

7Bh

C1h

61h

80h

5Bh

42h

00h

36h

88h

DFh

Word 1: 7BC1h = 01111 011110 00001

Word 2: 6180h = 0110 00011 0000000

Word 3: 5B42h = 0101 101101 000010

Word 4: 0036h = 0000000000110110

Event type 0001 1 MAX

Minutes 011110 30

Hour 01111 15

Year 0000000 00

Day 00011 03

Month 0110 06

Variable type 001000 08 A L1

Seconds 101101 45

Value 110110 54

The engineering unit and the decimal point position of the variable are obtained by reading the “info”

value in the instantaneous variables area (see example 2).

Gross Automation (877) 268-3700 · www.carlogavazzisales.com · [email protected]

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