Parameterizing
3.3 Presence check and MDS control
FC 45
3-24
Function manual, Release 03/2006 , J31069-D0167-U001-A2-7618
3.3.1
No MDS Control, No Presence Check: MDS_control = 0
The magnetic field of the write/read device is not turned on unless a valid MDS command
(read, write, initialize) is started. After a data memory has been detected and the command
has been executed, the write/read device is turned off again. This makes it possible to
implement projects in which the distance from one write/read device to another write/read
device may be less than specified. Prerequisite: the write/read device stations which are
close to each other must be addressed in multiplex mode. This may become necessary in
applications in which large amounts of data must be transferred in dynamic operation.
Stopping the conveyor belt can be avoided by dividing up the data and spreading it over
several write/read devices.
Note
The NEXT command cannot be used when the MOBY-ASM is run with MDS_control = 0.
If NEXT is started anyway, the error message error_MOBY = 10 hex is generated.
3.3.2
No MDS Control, Presence Control with Field Scanning: MDS_control = 1
In this mode, the field of the selected write/read device is always on. As soon as an MDS
moves into the field of the write/read device, this is indicated to the user via the
ANZ_MDS_present bit (see Section "Command and status word"). The user can then start a
command at any time. There is no error message if the MDS leaves the field during
processing.
Note
The NEXT command cannot be used when the MOBY-ASM is run without MDS control. If
NEXT is started anyway, the error message error_MOBY = 10 hex is generated.