Siemens SIMATIC FC 45 Function Manual page 41

Sensors
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NEXT command
The Next command switches ASM control to the next mobile data memory. The Next
command must always be programmed when MDS control is used (MDS_control = 2).
After the ASM acknowledges the Next command, a read/write job for the next MDS can be
sent immediately to the write/read device. The new command waits on the ASM until the old
MDS has left the field and a new one has entered.
This type of programming makes it possible to execute an ASM command as soon as an
MDS enters the field of the write/read device.
It can be very advantageous to add the NEXT command at the end of a command chain
(see Section "Command chaining").
See also
INPUT parameters (Page 3-3)
FC 45
Function manual, Release 03/2006 , J31069-D0167-U001-A2-7618
Parameterizing
3.3 Presence check and MDS control
3-23

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