Mds Functions; General Information On Read And Write-Accessing An Mds - Siemens MOBY series User Manual

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4.2

MDS Functions

4.2.1 General Information on Read and Write-Accessing
an MDS
The MOBY D, MOBY E and MOBY F MDSs use block-oriented data accessing.
A read or write-access to an MDS is only possible at the beginning of a block.
One block contains 16 bytes (or 10 hex) with MOBY E/F. Thus, the start
addresses for MDS processing to be entered on the STG are:
00, 10, 20, 30 hex and so on.
With MOBY D a block has a length of 4 bytes (I-Code, Tag-it) or 8 bytes (my-d).
The start addresses are:
00, 04, 08, 12 hex ... (I-Code, Tag-it) or
00, 08, 10, 18 hex ... (my-d).
With the MOBY D/E/F/U, the TagId on the display is automatically updated to
the current value after the read/write access.
STG Hand-Held Terminal
(5)J31069-D0126-U001-A5.1-7418
The "MOBY D/E/F/I/U" Programs
The MDS functions handle communica-
tion with the MDS.
The MDS function is not interrupted if
you briefly move the MDS out of the
read field. The MDS function is termi-
nated if MDS processing does not take
place for more than 30 seconds. See
chapter 4.5.
After a command is started, a window
with a bar appears on the display. This
bar shows how much of the command
has already been processed.
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