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4 Tips and Tricks
Checking the data buffer in the interface module / MV4x0
If you have logged in as the "Service" user and triggered the MV440 for test
purposes in "RUN" mode, the read results are buffered in the data buffer of the
reader / interface module and not transferred to the PLC. When the PLC takes
control again, this results in an offset of the read data.
Before executing a read command, make sure that the cyclic output parameters
"uin2" and "uin3" in the "Ident_Instance" are set to "FALSE". If this is not the case,
execute a "resetMv" without program change. This clears the data buffer and the
MV440 can correctly execute the read command.
Figure 4-2
Executing chained commands
The "Ident_Profile" and "AdvancedCMD" blocks allow you to send chained
commands to the readers. By sending multiple command frames in one call, you
can reduce the communication load on the fieldbus, which additionally reduces the
processing time.
MV Basics
Entry ID: 109757269,
V1.0,
04/2018
37
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