User Manual

VEGACOM 557 Siemens 27

Saving of VEGALOG data in a PLC data component

2 data words (4 bytes) are required per indicating value. These are saved in the PLC data

component DB as follows:

Image 2 VEGALOG functional component no. = 1 … 254 (source word address 0)

0 HB LB ME STAT VEGALOG functional component no. 1

2 HB LB ME STAT VEGALOG functional component no. 2

4 HB LB ME STAT VEGALOG functional component no. 3

248 HB LB ME STAT

250 HB LB ME STAT

252 HB LB ME STAT VEGALOG functional component no. 127

Note: For indicating values > 64 a second enquiry must be started

(64 • 4 = 256, see block size for Synchron order)

Explanation:

HB LB = Indicating value (Highbyte and Lowbyte)

ME = Field for measuring unit (will be filled with 0)

STAT = Status value

Status values:

STAT Meaning

00 H Valid value

01 H Simulated value

80 H Value not available

FF H General error

S5 functional component